Rock Anchor Tests in conglomerate

8/22/2019 Rock Anchor Tests in conglomerate

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BERIS DAM PROJECT

ROCK ANCHORTESTS


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ROCK ANCHORS AT

VARIOUS STRUCTURES

Structure Anchor dia

(mm)

Spacing

(m)

Length

(m)

Total No. Purpose

Main Dam Toe - Slab 25 1 4 1084 Provide anchorage of toe

slab with foundation to

improve sliding resistance

and provide support against

grouting pressure.

Spillway 32 2.0, 2.5 & 3.0 3.65 1405 Tie concrete lining with rock

and counteract against uplift

pressure.

Intake Tower

Foundation

32 3 3.65 25 Improve safety factor

against buoyancy.

Diversion Tunnel

Upstream Portal side

Wall

32 2.5 4 3 Tie side wall with rock.


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ESTIMATED PULL OUT LOAD FOR ROCK ANCHORS

dia.(ds) Length (L) D = 3 x d Spacing (s)

(mm) (m) (mm) (m) Single Group

SPILLWAY Side Channe l Trough Y32 3.65 96 2.0 2948 514 1101 624 370 185

Transition Portion Y32 3.65 96 2.0 2948 514 1101 624 370 185

Chute Sta.0+52 to Sta.0+97 Y32 3.65 96 2.0 2948 514 1101 624 370 185

Y32 3.65 96 2.5 2948 643 1101 624 370 185

Chute Sta.0+97 to Sta.1+41 Y32 3.65 96 2.5 2948 643 1101 624 370 185

Flip Bucket Y32 3.65 96 2.0 2948 514 1101 624 370 185

Y32 3.65 96 3.0 2948 771 1101 624 370 185

Plunge Pool Y32 3.65 96 2.2 2948 566 1101 624 370 185

Y32 3.65 96 2.5 2948 643 1101 624 370 185

Y32 3.65 96 3.0 2948 771 1101 624 370 185

Subtotal: 1405

Spillway Bridge 16 Y25 2.50 75 2.0 947 241 589 427 370 185

INTAKE TOWER Foundation 25 Y32 3.65 96 3.0 2948 771 1101 624 370 185

MAIN DAM Toe Slab 1084 Y25 4.00 75 1.0 3880 309 942 534 226 113

U/S PORTAL Side Wall 3 Y32 4.00 96 2.5 3880 772 1206 684 370 185

Total: 2533

Ultimate Capacity of Anchors:Anchor Stability of rock

Single: P = L3 x g x p tan f where; g = 23 kN/m3

f = 40o

Group of Anchors : P = L2

x g . stan f where; g = 23 kN/m3

f = 40o

Bond between Cement Grout and Rock P = pDLt where; t = 1000 kPa (Little john ultimate bond stress for Sandstone)

Bond between Bar and Concrete P = p.ds x L x tb where; tb = 1.70 N/mm2

Yield failure of bar P = p/4.ds2

x 460MPa

Ultimate Pull Out Load , P (kN)

Cement grout

and rock

bar and

concrete

Yield failure

of bar

Anchor Stability of RockAllowable Pull out

Capacity with

( Fs = 2 ) kN

3

STRUCTURE PART OF STRUCTURE

ANCHOR BAR DETAILNo. of

Anchors


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INSTALLATION DETAILS

Diameter ofdrillhole

3 times dia of steelbar

Grout Mix

Cement W/c ratio

c/admix ratio

Admixture(for

expansion, reduce

bleeding, prevent

premature setting)

Mascrete fly-ash0.45

0.015

Intraplast by Sika


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PULL OUT TEST

ARRANGEMENT

500x500x25m

thk.m.s.PLATE30 TONS JACK

DIAL GAUGES

Y32 BAR STOP

END

200x400x25m

thk.m.s.PLATE

0.6000 0.6000

0.009

0.1300.150

BB

A

A

ANCHOR BAR

9mm m.s

STIFFERNER

2 NOS

305X165X44.6kg/m

FILLET WELD


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PULL OUT TEST

ARRANGEMENT

200x400x25mthk.m.s.PLATE SECTION B-B

65mmX65mm

m.s ANGLE

GROUND MOVEMENTREFRENCE MARKER M.S.ANGLE FRAME TO

SUPPORT DIA.GAUGES

SECTION A-A

FILLET WELD

TO BAR

ANCHOR BAR


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ROCK ANCHOR PULLOUT TEST


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Pressure Load

(psi) (ton) D1(Top) D2(Bottom) Difference 1 2 3 4 5 6 7 8 9 10 111 0 0 0.00 0.00 0.00 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

2 100 3.42 0.00 0.00 0.00 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

3 200 6.84 0.20 0.04 0.16 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

4 300 10.26 0.74 0.37 0.37 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

5 400 13.68 1.65 0.43 1.22 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

6 500 17.1 1.96 0.59 1.37 51.395 51.397 51.403 51.401 50.378 51.485 51.480 51.479 51.480 50.602 50.598

7 600 20.52 2.29 0.80 1.49 51.396 51.398 51.403 51.402 50.378 51.485 51.480 51.479 51.480 50.602 50.598

8 700 23.94 2.50 1.05 1.45 51.397 51.398 51.403 51.403 50.378 51.485 51.480 51.479 51.480 50.602 50.5989 800 27.36 2.75 1.29 1.46 51.398 51.398 51.404 51.403 50.378 51.485 51.480 51.479 51.480 50.602 50.598

10 900 30.78 3.17 1.65 1.52 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598

11 1000 34.2 3.44 1.90 1.54 51.399 51.399 51.405 51.404 50.379 51.485 51.480 51.479 51.480 50.602 50.598

12 1100 37.62 3.89 2.29 1.60 51.399 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598

13 1100 37.62 3.89 2.29 1.60 51.399 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598

14 1000 34.2 3.76 2.19 1.57 51.400 51.400 51.406 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598

15 900 30.78 3.76 2.16 1.60 51.399 51.400 51.405 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598

16 800 27.36 3.69 2.12 1.57 51.399 51.400 51.404 51.405 50.379 51.485 51.480 51.479 51.480 50.602 50.598

17 700 23.94 3.52 2.00 1.52 51.399 51.400 51.404 51.404 50.379 51.485 51.480 51.479 51.480 50.602 50.598

18 600 20.52 2.27 1.88 0.39 51.399 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598

19 500 17.1 2.07 1.62 0.45 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598

20 400 13.68 1.90 1.54 0.36 51.398 51.399 51.404 51.403 50.379 51.485 51.480 51.479 51.480 50.602 50.598

21 300 10.26 1.57 1.20 0.37 51.398 51.399 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598

22 200 6.84 1.25 0.94 0.31 51.397 51.398 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598

23 100 3.42 1.03 0.77 0.26 51.397 51.398 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598

24 0 0 0.75 0.61 0.14 51.396 51.397 51.403 51.402 50.379 51.485 51.480 51.479 51.480 50.602 50.598

Reference bench mark: EL + 50.500 m Back Sight : 1.182 m

LHS 4 RHS

1

Date : 10 October 2002

Dial Gauge Reading (mm) Reduced Level at Reference Points

Legend: Reference Level Points

TimeNo.

BERIS DAM PROJECT -SIK, KEDAH

SPILLWAY- ROCK ANCHOR INITIAL LOAD TEST

Location : CH151.50

9

6 7

5

3

2

8

1011


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BERIS DAM PROJECT

Spillway - Rock Anchor Pull Out Test No. 6

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

0 3.42 6.84 10.26 13.68 17.1 20.52 23.94 27.36 30.78 34.2 37.62 37.62

Tensile Load (Ton)

DialGaugeReading(mm

)

D1 (Top)

D2 (Bottom)

Documents

Rock Anchor Tests in conglomerate