Report on Sub-Surface Properties of Soil Development

8/6/2019 Report on Sub-Surface Properties of Soil Development

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Chittagong Hill Tract Development Facilities (CHTDF)

United Nations Development Programme

MainR

eport

Deliverable02Sub-Surface Properties of Soil

Developm ent in Ranga mati,

Bandarban and Khagrac hari

Municipality

January 2010

Submitted By


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TableofContent

PageNo.

1.Introduction

1

1.1ScopeofWork 1

1.2BoreholeLocationsandSelectionCriteria 1

2.MethodsandMaterials 62.1.FieldWork 6

2.1.1.WashBoring 6

2.1.2.SoilSampling 7

2.1.2.1.ThinwalledSampler 10

2.1.2.2.SplitspoonSampler 10

2.1.3.StandardPenetrationTest(SPT) 11

3.Conclusion 14

ListofTablesTable1:GeotechnicalboreholelocationsinRangamatiTown 3

Table2:GeotechnicalboreholelocationsinBandarbanTown 3

Table3.GeotechnicalboreholelocationsinKhagrachariTown. 4

ListofFiguresFigure1:WashBoring. 7

Figure2.(a)Thinwalled(ShelbyTube)Sampler,and(b)SplitspoonSampler. 10

Figure3:Splitspoonsampler 12

Figure4:TheSPTsamplerinplaceintheboring. 13

ListofMapsMap1:BoreholelocationsinRangamatiMunicipality 2

Map2:GeotechnicalboreholelocationsareshowninBandarbanTown. 4Map3.GeotechnicalboreholelocationsareshowninKhagrachariTown 5


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GeotechnicalInvestigationusingStandardPenetrationTest(SPT)inRangamati,BandarbanandKhagrachari

Towns

1

1. Introduction1.1ScopeofWork

TheAsianDisasterPreparednessCentre(ADPC)isimplementingtheprojectSeismicHazard

andVulnerabilityMappingforRangamati,BandarbanandKhagrachariMunicipality. Oneof

themajoroutcomesoftheprojectisthedevelopmentofseismichazardmapsofthesethree

municipalities. Subsurface geotechnical investigation is essential to determine engineering

propertiesofsubsurfacematerialsforthepreparationofengineeringgeologicalandseismic

hazard maps. The objectives of the subsurface geotechnical investigation of Rangamati,

BandarbanandKhagrachariTownsinclude:

1. Construction of 10 (ten) SPT (Standard Penetration Test) boreholes using manualwashboringmethod.

2. Collectionofdisturbedsamplesusingsplitspoonsamplerandundisturbedsamplesusingshelbytubingsampler.

3. Performance of geotechnical laboratory tests such as, moisture content, specificgravity, Atterberg limits, unit weight, grain size analysis, unconfined compression

strength,directshear,triaxialteststodeterminephysicalandengineeringproperties,

and shear strength parameters of the collected disturbed and undisturbed

subsurfacesoilmaterialsofRangamati,BandarbanandKhagrachariTowns.

This report presents the initial findings from the boreholes conducted in the three

municipalities.

1.2 BoreholeLocationsandSelectionCriteria

ThegeotechnicalboreholeswithStandardPenetrationTest(SPT)havebeenconductedusing

washboringmethod.Inthisinvestigation,09(nine)boreholesinRangamatiTown,10(ten)

boreholes in Bandarban Town and 11 (eleven) boreholes in Khagrachari Town have been


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2

prepared up to maximum 30 m depth. The borehole logs of three towns are enclosed in

Appendix.

Rangamati

ResponseanalysiswillbeconductedusingSPTvaluetoidentifysoftsedimentarysoilwhich

will amplify the seismic energy of the place. In Rangamati as the tertiary bed rocks are

exposedinthehillyareas,therewasnoneedfortheSPTvaluesinthoseareas.

Map1:BoreholelocationsinRangamatiMunicipality


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3

From the geomorphic assessment, Rangamati Municipality has been classified into 3

differentclassesviz.ValleyFilldeposit,ErosionalSlopePhaseandPiedmonddeposit other

than

the

Hilly

areas.

The

selection

criteria

for

the

SPT

locations

are

described

as

follows:

Table1:GeotechnicalboreholelocationsinRangamatiTown

Borehole

No.

Location Latitude Longitude GeomorphicUnit

01 Shadhonapur,Rangapani 2238'19" 9209'34.6" ErosionalSlopePhase

02 Chompaknagar,Rangapani 2238'41.8" 9209'37.9" ErosionalSlopePhase

03 Monoghar,Vedvedi 2238'59" 9209'21.7" ValleyFillDeposit

04 Montolla,Vedvedi 2239'10.5" 9209'39.5" ValleyFillDeposit

05 Jhograbil,Thonchonkapara 2237'31.6" 9209'45.8" PiedmondDeposit

06 Notunpara,Vedvedi 2239'13.8" 9209'09.3" ValleyFillDeposit07 MitingaCharaPara,Thonchonkapara 2236'55.7" 9209'55.5" PiedmondDeposit

08 DakhinThonchonkapara,Jograbil 2237'42.9" 9209'44.5" PiedmondDeposit

09 BDRSectorHeadquartersGate 2237'53.7" 9211'15.9" PiedmondDeposit

Somelocationshavebeenavoidedasthereisnourbanizationinthoseparticularareas, i.e.

theseismicvulnerabilityiszero.Tocrosscheckandrepresentuniquesuccessiveunits,2or3

boreholeshavebeenselectedfromeachclass.

Bandarban

InBandarban7differentgeomorphicclasseshavebeenidentifiedotherthanthehillyareas.

ThelocationsofSPTarediscussedasfollows:

Table2: GeotechnicalboreholelocationsinBandarbanTown

Borehole

No.

Location Latitude Longitude GeomorphicUnit

01 RasselColony,ArmyPara 2211'35" 9213'3.6" ErosionalSlopePhase

02 BandarbanGovt.HighSchool 2211'49.69" 9213'6.41"FloodPlane

03

Rajar

Math

2211'50.5"

9213'15" MarshyLand

04 GirichaiyaPoliceQuarter 2211'40.6" 9213'18.8"

ErosionalSlopePhase/Valley

Fill

05 BandarbanStadium 2211'31.78" 9213'23.83" LevelHill

06 KalaghataNotunBridge 2211'21.2" 9213'51.1" PiedmondDeposit

07 Lushaibari 2211'20.4" 9213'07.7" ValleyFill

08 ShoiloshovaHousingSociety 2212'44" 9212'33" FloodPlane

09 BalaghataMuslimPara 2213'03.1" 9212'42.8" ErosionalSlopePhase

10 WestBalaghata` 2213'20.53" 9212'09.56" ValleyFill


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Towns

4

Map2: GeotechnicalboreholelocationsareshowninBandarbanTown.

Khagrachari

InKhagracharionlydifferentgeomorphicclasseshavebeenidentifiedotherthanthehilly

areas.ThelocationsofSPTarediscussedasfollows:

Table3.GeotechnicalboreholelocationsinKhagrachariTown.

Borehole

No.

Location Latitude Longitude Geomorphicunits

01 DakhinModhupur 230611.2 915941.3 Valleyfilldeposit

02 Milonpur 230627.4 915916.9 RoundedValleyfill

03 Islampur 23060.4 915925.3 RoundedValleyfill

04 NewZealandRoad 230602.1 915924.7 RoundedValleyfill


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Towns

5

Borehole

No.

Location Latitude Longitude Geomorphicunits

05 Anondonagar 230616.1 915910.2 RoundedValleyfill

06

KhagrachariTechnicalTraining

Institute 230522.5 915851.4

Pointbardeposit

07 ArambagMath 230632.5 915845.9 RoundedValleyfill

08 Khobongpuria 230638.2 915815.8 Floodplane

09 KhagrachariMunicipality 230626.6 915853.5 RoundedValleyfill

10 Dewanpara,BesideBDRCamp 230717.3 915807 Floodplane

11 DakhinKhobongpuria 230629.3 915808.24 Pointbardeposit

Asthewholecityismostlyfallwithinroundedvalleyfillareas,differentlocationshavebeen

selectedwithreferencetodifferentlevelsoftheEngineeringBedRock.

Map3.GeotechnicalboreholelocationsareshowninKhagrachariTown


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Towns

6

2. MethodsandMaterialsThe methods and materials used to carry out the geotechnical investigation have been

describedbelow:

2.1. FieldWorkAdetailfieldworkhasbeencarriedouttoselectthe locationsofgeotechnicalborehole in

different geomorphological and geological units of three towns. The locations of the

boreholes havebeen recorded usingGlobal PositioningSystem (GPS). Theboreholeshave

been constructed in most of the geomorphological units of the towns. The geological

materialsencounteredinboreholeshavebeeninterpretedandclassifiedinthefield.

2.1.1. WashBoringIn this method, water is pumped through a string of hollow boring rods and is released

under pressure through narrow holes in a chisel attached to the lower end of the rods

(Figure 1). The soil is loosened and broken up by the waterjets and the up and down

movement of the chisel. There is also provision for the manual rotation of the chisel by

meansofatillerattachedtotheboringrodsabovethesurface.Thesoilparticlesarewashed

tothesurfacebetweentherodsandthesideoftheboreholeandareallowedtosettleoutin

asump.Therigconsistsofaderrick,awinchandawaterpump.Thewinchcarriesa light

steelcablewhichpassesthroughthesheafofthederrickand isattachedtothetopofthe

boringrods.Thestringofrodsisraisedanddroppedbymeansofthewinchunit,producing

the choppingactionof thechisel.Theborehole isgenerallycasedbut themethodcanbe

usedinuncasedholes.Drillingfluidmaybeusedasanalternativetowaterinthemethod,

eliminatingtheneedforcasing.

Wash boring can be used in most types of soil but progress becomes slow if particles of

coarsegravelsizeandlargerarepresent.Theaccurateidentificationofsoiltypesisdifficult

duetoparticlesbeingbrokenupbythechiselandtomixingasthematerialiswashedtothe


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7

Figure 1: Wash Boring.

surface: in addition, segregation of particles takes place as they settle out in the sump.

However,achangeinthefeeloftheboringtoolcansometimesbedetected,andtheremay

be

a

change

in

the

color

of

the

water

rising

to

the

surface,

when

the

boundaries

between

different strata are reached. The method is unacceptable as a means of obtaining soil

samples. It isusedonlyasameansofadvancingaboreholetoenabletubesamplestobe

taken or insitu testssuch asStandard PenetrationTest (SPT) tobecarried out below the

bottomofthehole.Anadvantageofthemethodisthatthesoilimmediatelybelowthehole

remainsrelativelyundisturbed.

2.1.2. SoilSamplingSoilsamplesaredivided intotwomaincategories,undisturbedanddisturbed.Undisturbed

samples,whicharerequiredmainlyforshearstrengthandconsolidationtests,areobtained


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Towns

8

bytechniqueswhichaimatpreservingtheinsitustructureandwatercontentofthesoil.In

boreholes, undisturbed samples can be obtained by withdrawing the boring tools (except

when

hollow

stem

continuous

flight

augers

are

used)

and

driving

or

pushing

a

sample

tube

into the soil at the bottom of the hole. The sampler is normally attached to a length of

boring rodwhichcanbe loweredandraisedby thecableof thepercussionrig.Whenthe

tube is brought to the surface, some soil is removed from each end and molten wax is

applied, inthin layers,to formasealapproximately25mmthick:theendsofthetubeare

thencoveredbyprotectivecaps.Undisturbedblocksamplescanbecutbyhand from the

bottom or sides of a trial pit. During cutting, the samples must be protected from water,

wind

and

sun

to

avoid

any

change

in

water

content:

the

samples

should

be

covered

with

moltenwaximmediatelytheyhavebeenbroughttothesurface.Itisimpossibletoobtaina

sample that is completely undisturbed, no matter how elaborate or careful the ground

investigation and sampling techniquemight be. In thecaseofclays, for example, swelling

willtakeplaceadjacenttothebottomofaboreholeduetothereduction intotalstresses

whensoilisremovedandstructuraldisturbancemaybecausedbytheactionoftheboring

tools; subsequently, when a sample is removed from the ground the total stresses are

reducedtozero.

Soft clays are extremely sensitive to sampling disturbance, the effects being more

pronounced inclaysof lowplasticitythan inthoseofhighplasticity.Thecentralcoreofa

soft clay sample will be relatively less disturbed than the outer zone adjacent to the

sampling tube. Immediately after sampling, the pore water pressure in the relatively

undisturbedcorewillbenegativeduetothereleaseoftheinsitutotalstresses.Swellingof

therelativelyundisturbedcorewillgraduallytakeplaceduetowaterbeingdrawnfromthe

moredisturbedouterzoneandresultinginthedissipationofthenegativeexcessporewater

pressure:theouterzoneofsoilwillconsolidateduetotheredistributionofwaterwithinthe

sample. The dissipation of the negative excess pore water pressure is accompanied by a

correspondingreductionineffectivestresses.Thesoilstructureofthesamplewillthusoffer

lessresistancetoshearandwillbelessrigidthantheinsitusoil.


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9

Adisturbedsampleisonehavingthesameparticlesizedistributionastheinsitusoilbutin

whichthesoilstructurehasbeensignificantlydamagedorcompletelydestroyed;inaddition,

the

water

content

may

be

different

from

that

of

the

in

situ

soil.

Disturbed

samples,

which

areusedmainlyforsoilclassificationtests,visualclassificationandcompactiontests,canbe

excavated from trialpitsorobtained fromthe toolsusedtoadvanceboreholes (e.g. from

augers and theclaycutter). The soil recovered from the shell in percussionboring willbe

deficientinfinesandwillbeunsuitableforuseasadisturbedsample.Samplesinwhichthe

natural water content has been preserved should be placed in airtight, noncorrosive

containers: all containers should be completely filled so that there is negligible air space

above

the

sample.

All samples should be clearly labeled to show the project name, date, location, borehole

number,depthandmethodofsampling; inaddition,eachsampleshouldbegivenaserial

number. Special care is required in the handling, transportation and storage of samples

(particularlyundisturbedsamples)priortotesting.

Thesamplingmethodusedshouldberelatedtothequalityofsamplerequired.Qualitycan

beclassifiedasfollows,accordingtotheusestowhichthesamplecanbeput:

Class1:classification,watercontent,density,shearstrength,deformationandconsolidation

tests.

Class2:classification,watercontentanddensitytests.

Class3:classificationandwatercontenttests.

Class4:classificationtestsonly.

Class5:strataidentificationonly.

ForClasses1and2thesamplemustbeundisturbed.SamplesofClasses3,4and5maybe

disturbed.

Thetypesoftubesamplersusedinthisstudyaredescribedasfollows.


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2.1.2.1. ThinwalledSamplerThinwalled samplers (Figure 2) have been used to collected undisturbed samples from

boreholes.Thesesamplersareusedinsoilswhicharesensitivetodisturbancesuchassoftto

firmclaysandplasticsilts.Thesamplerdoesnotemployaseparatecuttingshoe,thelower

end of the tube itself being machined to form a cutting edge. The internal diameter may

range from 35 to 100 mm. The area ratio is approximately 10% and samples of firstclass

qualitycanbeobtainedprovidedthesoilhasnotbeendisturbedinadvancingtheborehole.

Intrialpitsandshallowboreholesthetubecanoftenbedrivenmanually.

2.1.2.2. SplitspoonSamplerSplitspoon samplers (Figure 3) have been to collect disturb samples. It consists of a tube

which is split longitudinally into two halves: a shoe and a sampler head incorporating air

Figure 2. (a) Thin-walled

(Shelby Tube) Sampler, and

(b) Split-spoon Sampler.

(a)

b


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Towns

11

releaseholesarescrewedontotheends.Thetwohalvesofthetubecanbeseparatedwhen

the shoe and head are detached to allow the sample to be removed. The internal and

external

diameters

are

35

and

50

mm,

respectively,

the

area

ratio

being

approximately

100%,withtheresultthatthereisconsiderabledisturbanceofthesample(Class3or4).This

sampler is used mainly in sands, being the tool specified in the standard penetration test

(SPT).

2.1.3. StandardPenetrationTest(SPT)One of the oldestand mostcommon insitu tests is the StandardPenetration Test orSPT

(Figure 7). It was developed in the late 1920s and has been used extremely in North and

SouthAmerica, theUnitedKingdom, Japan,andelsewhere.Becauseof this long recordof

experience, the SPT is wellestablished in engineering practice. It is performed inside

exploratoryboring using inexpensive and readily available equipment, and thus adds little

costtoasitecharacterizationprogram.

Although the SPT also is plagued by many problems that affect its accuracy and

reproducibility, it probably will continue to be used for the foreseeable future, primarily

because of its low cost. However, it is partially being replaced by other test methods,

especiallyonlargerandmorecriticalprojects.

TheASTMstandardD1586hasbeenfollowedtocarryoutSPT.Theprocedureisasfollows.

1. Drilla60200mm(2.58 in)diameterexploratoryboringtothedepthofthefirsttest.

2. InserttheSPTsampler(alsoknownasaSplitspoonSampler)intotheboring.Theshape and dimensions of this sampler are shown in Figure 4. It is connected via

steelrodstoa63.5kg(140lb)hammer,asshowninFigure5.

3. Using either a rope and cathead arrangement (in case of wash boring used thistechnique in this investigation) or an automatic tripping mechanism (in case of

rotary drilling used this technique in this investigation), raise the hammer a


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distanceof760mm(30in)andallowittofall.Thisenergydrivesthesamplerinto

thebottomoftheboring.Repeatthisprocessuntilthesamplerhaspenetrateda

distance

of

450

mm

(18

in),

recording

the

number

of

hammer

blows

required

for

each150mm(6 in) interval.Stopthetest ifmorethan50blowsarerequiredfor

any of intervals, or if more than 100 total blows are required. Either of these

eventsisknowsasrefusalandissonotedontheboringlog.

4. ComputetheNvaluebysummingtheblowcountsforthelast300mm(12in)ofpenetration.Theblowcount forthe first150mm (6 in) isretained forreference

purposes,butnotusedtocomputeNbecausethebottomoftheboringislikelyto

be disturbed by the drilling process and may be coveredwith loose soil that fell

from the sides of the boring. Note that the Nvalue is the same regardless of

whethertheengineerisusingEnglishorSIunits.

5. ExtracttheSPTsampler,thenremoveandsavethesoilsample(disturbedsample).6. Drill the boring to the depth of the next test and repeat steps 2 through 6 as

required.

Figure3: Splitspoonsampler


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Figure4:TheSPTsamplerinplaceintheboring.

Thus,Nvaluesmaybeobtainedat intervalsnocloserthan500mm(20 in).Typicallythese

testsareperformedat1.55m(515ft)intervals(1.5mintervalinthisinvestigation).

ThetermconsistencyofthecohesivesoilisgenerallyusedonthebasisoftheSPTvalues(N)

inthefollowingway.

N ... 02 ... ... VerySoft

N ... ... 24 ... ... Soft

N ... ... 48 ... ... Medium

N

...

...

8

15

...

...

Stiff

N ... ... 1530 ... ... VeryStiff

N ... ... 3050 ... ... Hard

N ... ... >50 ... ... VeryHard


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ThetermrelativedensityforthenoncohesivesoilisusedonthebasisoftheSPTvalues(N)

inthefollowingway.

N

0

4

...

Very

loose

N ... ... 410 ... ... Loose

N ... ... 1030 ... ... Mediumdense

N ... ... 3050 ... ... Dense

N ... ... >50 ... ... Verydense

3. ConclusionSubsurface geotechnical investigation is essential to determine engineering properties of

subsurfacematerialsforthepreparationofengineeringgeologicalandseismichazardmaps.

Detail field work has been carried out to select the locations of geotechnical borehole in

different geomorphological and geological units of three towns. The locations of the

boreholes havebeen recorded usingGlobal PositioningSystem (GPS). Theboreholeshave

been constructed in most of the geomorphological units of the towns. The geological

materials encountered in boreholes have been interpreted and classified in the field. The

geotechnical boreholes with Standard Penetration Test (SPT) have been conducted using

washboringmethod.Inthisinvestigation,09(nine)boreholesinRangamatiTown,10(ten)

boreholes in Bandarban Town and 11 (eleven) boreholes in Khagrachari Town have been

prepared up to maximum 30 m depth. Splitspoon samplers have been used to collect

disturb samples. Disturbed samples are used mainly for soil classification tests, visual

classification.Thinwalledsamplershavebeenusedtocollectedundisturbedsamplesfrom

boreholes.Thesesamplersareusedinsoilswhicharesensitivetodisturbancesuchassoftto

firmclaysandplasticsilts.Undisturbedsamplesarerequiredmainlyforshearstrength.


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AnnexI


Development in Rangama ti

Municipality

January 2010

Submitted By

House#531/4,Lane#11(West),BaridharaDOHS,Dhaka1219,Bangladesh


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Depth Sam le Borem) No. Lo

15cm 15cm 15cm N-value

2.5 1.5 S-1 1 0 1 1

3 S-2 3 4 5 9

4.5 4.5 S-3 1 2 7 9

6 S-4 3 4 5 9

7.5 S-5 1 2 2 4

1.5

9 S-6 3 4 5 9

1.5

10.5 S-7 10 15 25 40

1.4

12 S-8 25 55 110 165

5.1 13.5 S-9 15 35 43 78

15 S-10 18 60 93 153

16.5 S-11 50 150

Asian Disaster Preparedness Center (ADPC)

Gray loose SAND

Yellowish brown very dense

SAND

CLAY

Gray loose SAND

SAND

Yellowish brown dense

10 20 30 40 50

Lithologic Description

Extg. G.L

SPT Values SPT Curve

Gray to brown very soft

Gray medium silty CLAY

with sand

Location:Shadhonapur, Rangamati Town

Latitude: 22 38' 19.0"

Client Name : UNDP-CHTDF

Thickness

m

Date: 23-12-2009Longitude: 92 09' 34.6"

Borehole No: 01

Project: Seismic Hazard and Vulnerability Assessment of Rangamati Town Boring Depth: 16.5 m

G.W.L: 2.44 m


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Thickness Depth Sample Bore

(m) (m) No. LogExtg. G.L 15cm 15cm 15cm N-value 10 20 30 40 50

2.3

1.5 S-1 2 3 3 6

3 S-2 1 2 1 3

3.2 Gray loose clayey SAND

4.5 S-3 2 3 4 7

1.5 6 S-4 Gray soft CLAY with peat 1 1 2 3

7.5 S-5 1 2 4 6

1.3 Gray loose SAND

9 S-6 30 70 130 200

3.7 10.5 S-7 15 25 32 57

12 S-8 30 130 150


Client Name : UNDP-CHTDF Borehole No: 02

Locatio:Chompoknagor,Rangapani, Rangamati Town

Boring Depth: 12 m

G.W.L: 1.83 m

Longitude: 92 09' 37.9"

SPT Values

Gray very dense SAND

Latitude: 22 38' 41.8"

Gray medium sandy CLAY

SPT CurveLithologic Description

Project: Seismic Hazard and Vulnerability Assessment of Rangamati Town

Date: 24-12-2009


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Thickness Depth Sam le Bore

m) m) No. LogExtg. G.L 15cm 15cm 15cm N-value 10 20 30 40 50

2 1.5 S-1 1 0 1 1

3 S-2 2 3 4 7

3.5 4.5 S-3 2 3 5 8

6 S-4 3 5 7 12

1.5

7.5 S-5 10 16 25 41

9 S-6 12 22 32 54

5

10.5 S-7 20 42 90 132

12 S-8 88 218

Yellowish brown medium

SAND

Yellowish brown dense to

very dense SAND

CLAY

Yellowish brown loose

clayey SAND


Location:Monoghor,Vedvedy, Rangamati Town

Project: Seismic Hazard and Vulnerability Assessment of Rangamati Town

Longitude: 92 09' 21.7"

Lithologic Description SPT Values

Latitude: 22 38' 59.0"

Gray very soft sandy

Date: 25-12-2009

SPT Curve

G.W.L: 0.66 m

Borehole No: 03


Boring Depth: 12.0 m


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2.5 1.5 S-1 1 2 2 4

3 S-2 6 9 10 19

1.5

4.5 S-3 9 22 34 56

6 S-4 25 40 50 90

6.4

7.5 S-5 dense SAND 15 36 57 93

9 S-6 31 175

10.5 S-7 45 220


dense clayey SAND

Yellowish brown very

Extg. G.L

10 20 30 40 50

Gray very soft sandy CLAY

Thickness

mLithologic Description SPT Values SPT Curve

Location:Monotola, Vedvedy, Rangamati Town G.W.L: 0.31 m

Latitude: 2239'10.5" Longitude: 92 09' 39.5" Date: 26-12-2009


Project: Seismic Hazard and Vulnerability Assessment of Rangamati Town Boring Depth: 10.5 m



22/49

Depth Sam le Bore

m) No. Lo 15cm 15cm 15cm N-value

1.5 S-1 1 2 3 5

4

3 S-2 1 2 3 5

4.5 S-3 1 2 6 8

3 6 S-4 3 4 6 10

7.5 S-5 4 7 10 17

4.5 9 S-6 3 5 7 12

10.5 S-7 2 3 7 10

12 S-8 6 13 22 35

3.5 13.5 S-9 40 175 100

15 S-10 60 242 200


very dense SAND

Gray loose clayey

SAND

Gray medium dense

clayey SAND

Extg. G.L 10 20 30 40 50


CLAY

Thickness

m

Lithologic Description SPT Values SPT Curve

Location: Jhograbil Thonchonkapara,Rangamati Town G.W.L: 1.37 m

Latitude: 22 37' 31.6" Longitude: 92 09' 45.8" Date: 27-12-2009


Project: Seismic Hazard and Vulnerability Assessment of Rangamati Town Boring Depth: 15 m



23/49

Depth Sam le Bore


1.5 S-1 1 1 2 3

4

3 S-2 1 2 2 4

4.5 S-3 15 42 65 107

6 S-4 20 60 85 145

5

7.5 S-5 80 200

9 S-6 150 100


dense SAND


Extg. G.L 10 20 30 40 50

Gray soft to medium

sandy CLAY


Thickness

m


Project: Seismic Hazard and Vulnerability Assessment of Ragnamati Town Boring Depth: 9 m

Location:Notunpara, Vedvedy, Rangamati Town G.W.L: 2.44 m



24/49

Depth Sam le Bore


5.5 1.5 S-1 2 3 4 7

3 S-2 2 3 3 6

4.5 S-3 2 3 3 6

6 S-4 1 2 3 5

1.5

7.5 S-5 65 200

3.5 9 S-6 370

10.5 S-7



SAND


SAND

Extg. G.L 10 20 30 40 50


CLAY

Thickness

m


Locatio:Mitinga Chara Para, Thonchankapara, Rangamati Town G.W.L: 0.66 m



Project: Seismic Hazard and Vulnerability Assessment of Ragnamati Town Boring Depth: 10.5 m


25/49

Depth Sam le Bore


2.5 1.5 S-1 1 1 1 2

3 S-2 2 3 4 7

3 4.5 S-3 2 3 4 7

6 S-4 4 8 12 20

3

7.5 S-5 4 5 6 11

9 S-6 1 3 4 7

1.5

10.5 S-7 6 13 25 38

5

12 S-8 16 32 43 75

13.5 S-9 62 230

15 S-10 100 190



dense SAND


SAND

very dense SAND


clayey SAND.


Extg. G.L 10 20 30 40 50

Yellowish brown soft

sandy CLAY


Thickness

m


Project: Seismic Hazard and Vulnerability Assessment of Ragnamati Town Boring Depth: 15 m

Location: Jhograbil, Dakhin Tongchankapara, Rangamati Town G.W.L: 1.1 m



26/49

Thickness Depth Sam le Bore

m) m) No. LoExtg. G.L 15cm 15cm 15cm N-value 10 20 30 40 50

1.5 S-1 1 1 1 2

3

3 S-2 1 1 2 3

3 4.5 S-3 3 5 5 10

6 S-4 2 3 4 7

7.5 S-5 6 10 18 28

9 S-6 12 18 30 48

7.5

10.5 S-7 12 25 37 62

12 S-8 13 26 37 63

13.5 S-9 35 105 232 337

to very dense SAND



Project: Seismic Hazard and Vulnerability Assessment of Ragnamati Town Boring Depth: 13.5 m

Location:BDR sector Head quartergate,Rangamati Town G.W.L: 1.37 m

Longitude: 9211'15.9" Date: 30-12-2009


clayey SAND


Latitude: 22 37' 53.0"

Reddish brown soft CLAY



27/49



Ann

ex

II


Development in Bandarba n

Municipality

January 2010

Submitted By



28/49

Latitude: 22 11' 35"Depth Sam le Bore

(m) No. Log15cm 15cm 15cm N-value

1.5 S-1 1 2 3 5

4 Yellowish brown medium3 S-2 stiff CLAY 1 1 1 2

4.5 S-3 1 2 3 5

4.3 6 S-4 2 3 3 6

7.5 S-5 2 2 3 5

9 S-6 3 3 5 8

5.7 10.5 S-7 3 3 6 9Yellowish brown loose tomedium SAND

12 S-8 4 5 7 12

13.5 S-9 3 5 8 13

2 15 S-10 Grey medium silty SAND 5 8 12 20with clay

16.5 S-11 8 12 28 40

18 S-12 15 22 35 57

8 19.5 S-13 Grey dense to very dense 15 27 3o 57SAND

21 S-14 17 25 33 58

22.5 S-15 30 71 92 163

24 S-16 105 147

Date: 23-11-2009


Longitude: 92 13' 3.6"

10 20 30 40 50


Thickness

(m)



Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town Boring Depth: 24 m

Location:Rassel Colony, Armypara, Bandarban Town G.W.L: 3.05 m

Gray yellowish brown

medium stiff silty CLAY

Extg. G.L


29/49

Latitude: 22 11' 49.69"Depth Sam le Bore(m) No. Log


1.5 S-1 1 0 1 1

43 S-2 1 1 2 3

4.5 S-3 2 3 4 7

6 6 S-4 2 2 5 7

7.5 S-5 2 3 4 7

9 S-6 3 3 5 8

10.5 S-7 2 3 3 61.5

12 S-8 4 6 6 12

2.5 13.5 S-9 5 7 9 16

2 15 S-10 Grey hard clayey SILT 8 15 22 37

16.5 S-11 6 8 14 221.5

18 S-12 15 18 20 38

19.5 S-13 8 12 12 245.5

21 S-14 12 12 22 34

22.5 S-15 13 15 23 38

2 24 S-16 Gray very dense SAND 17 28 40 68

25.5 S-17 40 60 85 145

Grey medium SAND

Grey medium todense silty SAND

Yellowish brown mediumSAND.

Grey to yellowish brown

medium to stiff CLAY

Yellowish brown looseclayey SAND

Extg. G.L 10 20 30 40 50

Grey very soft to soft siltyCLAY with sand

Thickness

m)Lithologic Description SPT Values SPT Curve

Location:Bandarban Govt. High School, Bandarban Town G.W.L: 3.05 mLongitude: 92 13' 6.41" Date: 20-11-2009

Asian Disaster Preparedness Center (ADPC)Client Name : UNDP-CHTDF Borehole No: 02Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town Boring Depth: 25.5 m


30/49



1.5 S-1 1 2 2 4

8.653 S-2 1 2 3 5

4.5 S-3 4 5 6 11

6 S-4 4 5 7 12

7.5 S-5 3 5 7 12

9 S-6 3 4 6 10

10.5 S-7 3 4 6 109.05

12 S-8 3 4 5 9

13.5 S-9 3 4 5 9

.15 S-10 3 4 6 10

16.5 S-11 3 4 6 10

18 S-12 4 7 7 14

19.5 S-13 5 7 8 156.1

clayey SILT21 S-14 11 12 18 30

22.5 S-15 12 13 19 32

24 S-16 11 19 45 64

25.5 S-17 13 21 50 716.7 Gray very dense silty SAND

27 S-18 32 40 58 98

28.5 S-19 27 50 65 115

30 S-20 103 112

Gray to yellowish brown stiffsilty CLAY.

Dark gray very stiff to hard

Grey medium to stiffsilty CLAY

Longitude: 92 13' 15.0"

Extg. G.L 10 20 30 40 50

Asian Disaster Preparedness Center (ADPC)Client Name : UNDP-CHTDF Borehole No: 03

Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town

Thickness

mLithologic Description SPT Values

Boring Depth: 30 m

Location:Rajar Math, Bandarban Town G.W.L: 2.44 m

Latitude: 22 11' 50.5" Date: 17-11-2009

SPT Curve


31/49

DepthSample Bore


2.5 1.5 S-1 Yellowish brown soft CLAY 1 1 1 2

3 S-2 2 3 5 8

4.5 S-3 3 5 6 11

5.5 6 S-4 Gray to yellowish brown 2 3 5 8stiff CLAY

7.5 S-5 3 5 6 11

9 S-6 4 6 10 16

3.5 Gray medium silty SAND10.5 S-7 4 7 10 17

12 S-8 3 4 5 9

13.5 S-9 3 4 6 10

15 S-10 4 5 6 11

9 Gray stiff to very stiff sandy16.5 S-11 CLAY 3 5 7 12

18 S-12 5 8 12 20

19.5 S-13 5 8 12 20

21 S-14 18 20 28 482 Gray very dense SAND

22.5 S-15 140

Location:Girichaiya Police Quarter, Bandarban Town


Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town Boring Depth: 22.5 m

G.W.L: 2.13 m


Thickness

(m)


Extg. G.L 10 20 30 40 50


32/49



1.5 S-1 1 0 1 1

4

3 S-2 1 1 1 2

4.5 S-3 1 2 4 6

3.1 6 S-4 4 6 8 14

1.1 7.5 S-5 Gray loose SAND 2 3 4 7

2 9 S-6 Grey dense SAND 7 12 20 32

10.5 S-7 60 90

1.8 Grey very dense SAND

12 S-8 110 150

13.5 S-9 180

SPT Values SPT CurveThickness

m

Gray loose to medium

clayey SAND

Location:Bandarban Stadium, Bandarban Town



G.W.L: 2.0 m

Latitude: 22 11' 31.78" Date: 18-11-2009Longitude: 92 13' 23.83"


very soft to soft silty CLAY

Extg. G.L


10 20 30 40 50


33/49

DepthSample Bore


2.0 1.5 S-1 1 1 2 3

3 S-2 3 4 6 10

3.2

stiff CLAY

4.5 S-3 3 4 5 9

6 S-4 2 3 4 7

7.5 S-5 3 4 5 9

6.3 9 S-6 3 3 5 8

10.5 S-7 2 3 4 7

12 S-8 6 12 20 32

1.5

13.5 S-9 35 120

2.0

15 S-10 200

Grey very dense SAND

Grey loose clayey SAND

Grey dense silty SAND



medium stiff CLAY

Thickness

(m)




Extg. G.L 10 20 30 40 50


Location:Kalaghata Notun Bridge, Bandarban Town G.W.L: 0.46 m



34/49


35/49



1.5 S-1 1 1 2 3

4

3 S-2 1 1 2 3

4.5 S-3 1 2 3 5

3 Yellowish brown loose

6 S-4 SAND 1 2 2 4

7.5 S-5 2 4 6 10

1.5

CLAY.

9 S-6 1 2 3 5

2.8 Gray medium stiff

10.5 S-7 silty CLAY 2 3 3 6

12 S-8 6 9 15 24

13.5 S-9 6 10 16 26

6.7 15 S-10 Grey medium dense to very 6 10 15 25

dense SAND

16.5 S-11 13 18 22 40

18 S-12 13 22 148 170

Yellowih brown stiff

Extg. G.L 10 20 30 40 50

Gray to yellowish brown

soft CLAY

Thickness


Location:Shoiloshova Housing Society, Bandarban Town G.W.L: 2.44 m



Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town Boring Depth: 18 m


36/49



1.5 S-1 2 3 4 7

4

3 S-2 1 2 3 5

4.5 S-3 1 2 4 6

4.3 6 S-4 Yellowish brown loose 2 3 5 8SAND

7.5 S-5 3 4 5 9

9 S-6 2 2 3 5

10.5 S-7 1 2 3 5

12 S-8 2 3 5 8

9.2 13.5 S-9 2 3 6 9

CLAY

15 S-10 3 4 6 10

16.5 S-11 3 5 7 12

0.5 18 S-12 30 40 70 110

Gray medium stiff to stiff

Grey very dense SAND

Extg. G.L 10 20 30 40 50


medium stiff CLAY


Thickness


Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town Boring Depth:18 m

Location:Balaghata Muslimpara, Bandarban Town G.W.L: 2.29



37/49



1.5 S-1 1 2 3 5

3 S-2 1 2 4 6

4.5 S-3 1 2 3 5

6 S-4 1 2 3 5

10

7.5 S-5 2 3 4 7

9 S-6 2 3 4 7

10.5 S-7 3 3 6 9

12 S-8 2 4 6 10

6

13.5 S-9 3 5 5 10

15 S-10 3 5 6 11

0.5 16.5 S-11 Gray very dense SAND 28 45 85 130

Gray stiff CLAY

Extg. G.L

Latitude: 22 13' 20.53" Longitude: 92 12' 9.56"

Project: Seismic Hazard and Vulnerability Assessment of Bandarban Town

10 20 30 40 50


stiff to stiff CLAY

Date: 21-11-2009

Thickness



Location:West Balaghata (near Radio Station), Bandarban Town G.W.L: 3.05 m



38/49



Ann

ex

III


Development in Khagrac hari

Municipality

January 2010

Submitted By



39/49

Depth Sam le Bore


2

1.5 S-1 1 1 2 3

3 S-2 1 2 2 4

5 4.5 S-3 medium stiff silty CLAY 2 3 4 7

6 S-4 2 2 2 4

7.5 S-5 2 3 5 8

1.5 Gray to yellowish brown

9 S-6 4 7 8 15

3

10.5 S-7 7 11 14 25

12 S-8 18 22 30 52

13.5 S-9 15 25 51 76

5 Yellowish brown very dense

SAND

15 S-10 25 35 118 153

16.5 S-11 26 65 145 210


G.W.L: 0.76 m

Date: 15-12-2009Longitude: 91 59' 41.3"


Project: Seismic Hazard and Vulnerability Assessment of Khagrachari Town Boring Depth: 16.5 m

Location:Dakhin Madhupur, Khagrachari Town

Latitude: 23 6' 11.2"

10 20 30 40 50Extg. G.L

CLAY

Grey to yellowish brown soft

SPT CurveThickness

(m)



Grey medium dense SAND

stiff sandy CLAY


40/49



Location:Milonpur, Khagrachari Town G.W.L: 2.95 m


Thickness Depth Sam le Litholo i Bore

m) No. LoExtg. G.L 15cm 15cm 15cm N-value 10 20 30 40 50

1.5 S-1 2 3 5 8

5.3 3 S-2 Yellowish brown stiff CLAY 2 5 6 11

4.5 S-3 3 4 6 10

6 S-4 10 15 19 34

3.1

7.5 S-5 20 24 36 60

9 S-6 33 55 88 143

3.6

10.5 S-7 30 56 90 146

12 22 80 241


Yellowish brown

very dense SAND



to very dense SAND

Project: Seismic Hazard and Vulnerability Assessment of Khagrachari Town


41/49

Thickness Depth Sample Bore(m) (m) No. Log

Extg. G.L 15cm 15cm 15cm N-value 10 20 30 40 50

1.5 S-1 2 2 3 5


4 stiff CLAY

3 S-2 2 3 4 7

1.4 4.5 S-3 1 2 2 4

CLAY

6 S-4 3 5 7 12

4.6 7.5 S-5 6 10 15 25

9 S-6 6 11 15 26

10.5 S-7 14 29 36 65

3.5

12 S-8 26 75 175 250

13.5 S-9 40 120 100 220

Grey to yellowish brown soft


Gray medium dense SAND

dense SAND

Longitude: 91 59' 25.3"



Borehole No: 03Client Name : UNDP-CHTDF

Location:Islampur, Khagrachari Town G.W.L: 0.95 m

Boring Depth: 13.5 mProject: Seismic Hazard and Vulnerability Assessment of Khagrachari Town

Date: 19-12-2009Latitude: 23 07' 0.4"


42/49




1.5 S-1 2 2 2 4

4

3 S-2 2 2 2 4

4.5 S-3 2 2 3 5

3

6 S-4 2 2 2 4

7.5 S-5 3 4 5 9

3

9 S-6 3 4 5 9

10.5 S-7 7 10 19 291.5

SAND

12 S-8 30 40 45 85

3.5 13.5 S-9 30 50 102 152

SAND

15 S-10 65 106



Location:Newzeland Road,Khagrachari Town G.W.L: 0.0 m


Thickness


Extg. G.L

10 20 30 40 50


medium stiff CLAY


Grey medium dense

loose SAND

Gray stiff silty CLAY



43/49

Depth Sam le Borem No. Lo


1.5 S-1 1 2 2 4

5 3 S-2 Gray to yellowish brown 3 4 5 9

soft to medium CLAY

4.5 S-3 2 3 5 8

6 S-4 3 5 8 13

3

7.5 S-5 10 13 18 31

9 S-6 5 9 23 32

5.5

10.5 S-7 10 11 26 37

very dense SAND

12 S-8 10 35 50 85

13.5 S-9 20 80 160 240




Location:Anondonagar, Khagrachari Town G.W.L: 0.70 m


Thickness


Extg. G.L 10 20 30 40 50


dense SAND



44/49

Thickness Depth Sam le Borem) m) No. Lo

Extg. G.L 15cm 15cm 15cm N-value

10 20 30 40 50


2 1.5 S-1 1 2 2 4

2 3 S-2 3 6 10 16

4.5 S-3 2 3 4 7

3 6 S-4 3 4 5 9

7.5 S-5 8 11 14 25

3

9 S-6 6 16 18 34

10.5 S-7 12 32 50 82

5 12 S-8 12 20 12 35

with pebbles

13.5 S-9 30 115 100 215

15 S-10 32 110

Asian Disaster Preparedness Center (ADPC)Borehole No: 06


G.W.L: 0.46 m


Location:Technical Training Institute, Khagrachari Town

CLAY


dense clayey SAND


SAND


dense to dense SAND

Longitude: 91 58' 51.4"Latitude: 23 05' 22.5"


Date: 18-12-2009

SPT Curve


to very dense SAND



45/49

Depth Sam le Borem No. Lo


2 1.5 S-1 1 2 2 4

2 3 S-2 4 5 7 12

4.5 S-3 12 20 26 46

3 6 S-4 12 18 22 40

7.5 S-5 25 28 52 80

3.5 9 S-6 20 72 121 193

10.5 S-7 60 150

Borehole No: 07


Date: 12-12-2009


Location:Arambag Math, Khagrachari Town G.W.L: 1.83 m

Thickness

mLithologic Description

Latitude: 23 6' 32.5" Longitude: 91 58' 45.9"



Extg. G.L 10 20 30 40 50


CLAY



dense SAND

SAND


SAND


46/49



1.5 S-1 2 3 4 7

4

3 S-2 2 3 4 7

4.5 S-3 5 7 10 17

3

6 S-4 5 8 10 18

7.5 S-5 20 26 30 56

4.5 9 S-6 7 8 10 18

10.5 S-7 5 7 18 25

12 S-8 17 30 90 120

3.5 13.5 S-9 32 75 150 225

15 S-10 45 150


Asian Disaster Preparedness Center (ADPC)Borehole No: 08


Location:Khobongpuria, Khagrachari Town G.W.L: 1.90 m


Thickness


Extg. G.L

10 20 30 40 50


CLAY


Grey dense to very

dense SILT and SAND


dense SAND


47/49



1.5 S-1 1 1 1 2

5.5 3 S-2 1 1 1 2

4.5 S-3 1 1 2 3

6 S-4 3 4 6 10

1.5

7.5 S-5 12 17 22 39

4.5 9 S-6 8 12 20 32

SAND

10.5 S-7 12 18 25 43

0.5 12 S-8 Yellowsh brown very dense SAND 28 60 190 250


10 20 30 40 50


Location:Khagrachari Municipality G.W.L: 2.38 m


Grey soft CLAY


Thickness


Extg. G.L

soft CLAY.

Gray medium dense silty

CLAY with SAND


Grey coloured soft to very


48/49



1.5 S-1 1 1 1 2

4

3 S-2 1 2 2 4

4.5 S-3 10 14 24 38

3 6 S-4 Gray to yellowish brown 8 12 15 27

7.5 S-5 12 22 35 57

3.5 9 S-6 Yellowish brown very 15 40 72 112

10.5 S-7 25 60 210 270

dense SAND

dense SAND


Extg. G.L

10 20 30 40 50


soft to medium CLAY

Thickness




Location:Dewanpur Bazar, Khagrachari Town G.W.L: 0.69 m

Latitude: 23 07' 17.3" Longitude: 91 58' 07" Date: 14-12-2009



49/49




1.5 S-1 1 1 1 2

7 3 S-2 Gray soft to medium CLAY 1 1 1 2

4.5 S-3 1 1 2 3

6 S-4 1 2 2 4

7.5 S-5 6 10 19 29

1.5

9 S-6 22 50 102 152

2

10.5 S-7 36 105 120

Yeloowish brown very dense

SAND with pebbles


Extg. G.L

10 20 30 40 50

Thickness


Location:Dakkhin Khobonpuria, Khagrachari Town G.W.L: 2.31 m

Latitude: 23 06' 29.3" Longitude: 91 58' 24" Date: 21-12-2009



Documents

Report on Sub-Surface Properties of Soil Development