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IS 4410-20 (1983): Glossary of terms relating to river

valley projects, Part 20: Tunnels [WRD 14: Water Conductor

Systems]

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( Reaff irmed 2001 )

]I ul 1 83

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IS : 4410 ( Par t XX ) - 1983

Indian StandardGLOSSARY OF TERMS

RELATING TO RIVER VALLEY PROJECTSPART XX TUNNELS

Terminology Relating to River Valley ProjectsSectional Committee, BDe 46Chairman

SHm S. M. DEBRepresenting

Irrigation & Water Works Department, Government of West Bengal, Calcutta

Irrigation & Power Department, Government ofAndhra Pradesh, H yderabad

Ministry of Agriculture and IrrigationHydro-Consult International Pvt L td , New DelhiIndian Institute of Technology, New DelhiGeological Survey of India, Calcutta

DR j . PunUBHOTTAM ( Altemate)

DIRBCTORDEPUTY DIREC'J;OR ( Alternate)Dn:Ec1oR (CDO )

MembersCHIEF ENGINEER (DRAINAGE) Irrigation Works, Government of Punjab,ChandigarhDIRECTORWATER RESOURCES (Alternate)C:UIEFENGINEER (IRRIGATION) Public Works Department, Government of TamilNadu, MadrasSENIOR DEPUTY CHIEF ENGINEER( Alternate)DIRECTOR Irrigation Department, Go v e rn men t of

Maharashtra. BombaySurvey of India, Dehra DunIrrigation. Department, Government of Madhya, Pradesh, BhopalSHm K. K. b:URUVE (Allirnate) . .DIRECTOR (HYDROLOGY-I) .Central Water Commission, New DelhiSHRI N. K. DWIVEDI Irrigation Department, Government of UttarPradesh, LucknowBeas Designs Organizat ion, Nangal Township(Punjab)SHBI I. C. GUPTASHRI H. G. JOSHI ( Alternate)

j011>' COMMISSIONERSHnI K. V. KRIRHNAMURTBYSHm P. N. KUMRA (Alternate)PROF P. NATARAJANSHRI G. PANTSHm R. P. SINGH (Alternate)Snnr ]' . RAJA RAo

( Ctmtinued on page 2 )C Copyright 1983

INDIAN STANDARDS INSTITUTIONThis publication is pro tected under the Indien Copyright Act (XIV of 1957) an dreproduction in whole o r in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.

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IS : 4410 ( Part XX) 1983( Continued from page I

MembersSHBI DAMODAB SAHl1DR P. P. SEHGALSHRI G. RAMAN,Director ( Civ Engg )

RepresentingIrrigation & Power Department, Government ofOrissa, BhubaneshwarUniversity of Roorkee, RoorkeeDirector General, lS I ( Ex-officio MMllber)

SecrtltJrySHBI S. K. CHAl1DHURIDeputy Director ( Civ Engg), lS I

Panel for Glossary of Terms Relating to Tunnels, BDC 46 : Pl2Convener

SHBI O. P. DArTAMembers

KUMAR I E. DrvATIA

Beas Designs Organization, Talwara Township

National Hydro-Electric Power Corporation Ltd,New DelhiSHRI B. K. SHARKA( Alternate )PROF B. K. KAUL B. N. Chakravarty University, Kurukshetra(Haryana)SHRI K. RAMABHADBAN NAIR Kerala State Electricity Board, TrivandrumSHBI B. RAKAOBAJlDRAN Geological Survey of India, CalcuttaS H R I S . N . C B A T U B V E D I ( A U ~ e )SHBI MOHINDERKl1KAB SANGAL Irrigation Department, Govemment of UttarPradesh, LucknowDR H. R. SHARKA Central Water Commission, New Delhi

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IS : 4410 ( Par t XX) - 1983Indian Standard

GLOSSARY OF TERMSRELATING TO RIVER VALLEY PROJECTS

PART XX TUNNELS

O. FOR E W 0 R D0.1 This Ind ian S tandard (Part XX) was adopted by the IndianStandards Institution on 21 February 1983, af te r the draft finalized bythe Terminology Relating to River Valley Projects Sectional Committeehad been approved by the Civil Engineering Division Council.0.2 A number of Indian Standards have already been published coveringvar ious aspects of river valley projects and a large number of similarstandards are in the process of formulation. These standards includetechnical terms, th e precise definitions of which are required to avoidambiguity in their interpretation. To achieve this end, the Committeeis bringing out this standard. The other parts of the standard are listedon page 11.

1. SCOPE1.1 This standard covers the definitions of terms relating to tunnels.However, this standard does not cover te rms relating to tunnel equip-ments and geology.2. DEFINITIONS1..1 Access Tunn e l - An approach tunne l provided to reach anyunderground passage, cavern or structure.2.2 Adit - A horizontal or nearly horizontal access tunnel provided toreach inside of a main tunnel. I t may also apply to a passage withinconcrete structures, such as dams or spillways.2.3 Arch Action - The action of transference of load of rock includingits overburden across a tunnel or structure on to the two sides of thetunnel or the abutments.2.4 Back Packing - Filling o f gap between lagging and rock.

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IS : 4410 ( Par t XX) - 19832.5 Benching - The operation of removal of the lower portion of thetunnel profile after the top heading has been excavated.2.6 Blocking - A process of providing' wedges between rock and theribs to transfer the rock load to the ribs.2.7 Bottom Heading - The face of the tunnel where actual tunnellingoperations are in progress, However, when it is prefixed by 'top' or'bottom' it denotes a part section excavated in advance in the line of theintended tunnel.2.8 Bracing - A stiffening member provided between ribs/posts toprevent their buckling or shifting.2.9 Bratt ice - A partition wall of cloth plastered with clay erectedespecia lly in a mine tunnel to divide the excavation in two par ts length-wise. The division permits the fresh air to pass-in through one part andthe stale ai r to passout through the other, thus, improving the ventilationof the work area.2.10 Breas t Boards - A temporary support to prevent the face f romcaving in or flowing into a tunne l.2.11 Bridge Action Period - It is the time which elapses betweenfiring the shots and the breakdown of the equilibrium of the half domeof unsupported section beyond the last ri b of the tunnel supports.2.12 Bulkhead - A barrier placed at a tunne l heading to preventinflow of water or shattered rock into the tunnel.2.13 Cable Tunnel - A tunnel for leading power cables f rom powerhouse to switch yard.2.14 Cavitation - The phenomenon and the consequential formationof cavitation or pittings caused by the collapse of vapour bubbles inzones undergoing change from excessively low (or negative) to highpressure on the surface of a structure over which the liquid flows.2.15 Conventional or Dr iI I and Shoot Tunnel Iing - Method ofexcavating tunnel involving drilling of holes in the tunnel face, loadingwith explosive and then blasting.2.16 Cover - Cover on a tunnel in any direction is the distance fromthe tunnel soffit to the exposed surface of ground/rock in that direction.2.17 Crown Bars - These are horizontal bars provided during.excavation at the crown of the tunnel for supporting the roof and arelocated parallel to the centre l ine to ensure safety and limit overbreak.

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IS : 4410 ( Par t XX ) - 19832.18 Cut - In the drilling pattern ( see 2.24 ) the group of holes firedfirst in a round to provide additional free faces for the succeedingshots.2.19 Cut and Cover Sect ion - A closed section of a water-way that isformed by first excavating an open channel in the ground and thenroofing it over.2.20 Detonator - A device for producing detonation in a highexplosive charge, and initiated by a safety fuse or by electricity.2.21 Dome Action - The action of transference of load of rockincluding its overburden accross the tunnel on its sides, or in a tunnelnear the heading on sides and working face.2.22 Drift - A horizontal tunnel usually of small cross-section andlength driven either from surface for exploration purposes or from anunderground face for any purpose.2.23 Dri ll Carr iages - A vehicle on which one or more drill boomsare mounted to permit the drills to be brought easily to their work siteand to be removed before blasting.2.24 Drilling Pat te rn - An arrangement showing location, directionand depth of the holes to be drilled into the face of a tunnel.2.25 Dry I nt ake Tower - An intake tower through which passes pipecarrying water under pressure. The interior of th e tower is dry and isaccessible for inspection and operation of the intake pipe.2.26 Easer - Ring of holes drilled around cu t holes and fired after cutholes.2.27 Explosive - Any mixture of chemical compound which, underfavourable conditions, will burn or detonate quickly to produce highpressure.2.28 Final Lining - It is the concrete between primary lining and thefinished face of th e tunnel. .2.29 Fore Poling Method - Method of tunnelling by driving wood orsteel members into soft or weak rock! soil in th e arch of the tunnel beyondth e heading to provide roofsupport,2.30 Free Level Tunnel o r Free Flow Tunnel - A tunnel in whichwater flows with a free water surface. .

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IS : 4410 ( Par t XX ) - 19832.31 Fun Face Method - Excavat ing tunnel in full section with asingle operation.2.32 Grade Tunne l - A waterway tunnel constructed with the elevationof the top above th e hydraulic gradient.2.33 Guniting - A process of applying mixture of sand and cementpneumatically conveyed in a dry state to the nozzle of the gun wherewater is added immediately prior to expulsion and shot into place. Wetmixing can also be adopted as an alternative.2.34 Heading - The face of the tunnel where actual tunnellingoperations are in progress. However when it is prefixed by ' top' or'bottom' it denotes a part section excavated in advance in the line of theintended tunnel.2.35 Head Race Tunnel - A tunnel leading water from a reservoir orheadworks to th e forebay/penstock intakes/turbines.2.36 High Explosive - An explosive that reacts to detonation as anextremely rapid, almost instantaneous process with consequential releaseof tremendous energy and produces large volume ofgases at exceptionallyhigh pressure.2.37 Inlet or Intake Structure - A structure bui lt at the upstreamand of an water conductor system to draw water usually combined withtrash rack structure.2.38 Intake or Inlet Control Structure - I t is the inlet or intakestructure housing th e regulating and/or emergency gates.2.39 Intake Ports - The openings in the intake struc ture or towerwhich admit water.2.40 Intake Towe r - An inlet control structure to enable controlleddrawal of water from bikes, reservoirs or rivers with wide fluctuations orat different depths or both.2.41 Invert - The floor, bottom or lowest portion of the internal crosssection of a tunnel. ' .2.42 Invert St ru t - Strut installed between the side posts at the invertof the tunnel to withstand side pressure.2.43 Jumbo - A mobile platform with number of decks used at theheading of large size tunnels for drilling and also for scaling, erection-ofroof supports, guniting, shotcreting, etc.

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IS: 4410 (Par t XX) 19832.44 Jump Set - Steel or timber set placed between existing sets toprovide additional support.2.45 Lagging -Members of a tunnel support which span the spacebetween main supporting ribs.2.46 Machine Tunnell ing - Method of excavating tunnel by deployingmachines such as mole, shield, drifter, etc, without using explosive. Alsoknown as 'Boring a Tunnel'.2.47 Minimum Excavation Line ( A Line) - It is the line withinwhich no unexcavated material of any kind shall be permitted toremain.2.48 Mucking - The operation of removal of the blasted stones/materialafter the blas t has taken place.2.49 Outlet Tunnel - A tunnel for control led releases of water forirrigation, water supply and/or power generation from the storagereservoir.2.50 Outlet Works - A collective term for all components of themeans provided in a hydraulic system for release or drawal of water. Theterm includes such items as trash barrier, intake structures, the tunnelsor conduits the emergency and regulating gates or valves, the gatechamber or valve houses and stilling basin. This term excludesspillways.2.51 Overbreak - Removal of rock as the result of a blast, beyond theminimum excavation line.2.52 Overflow Shafts - Shaf ts in long pressure tunnel s constructed tolimit internal pressures by over-flow beyond a certain hydro-static headand to serve as air-vents for inlets during filling and emptying.2.53 Overt - The top arch portion of the tunnel.2.54 Packing - Material which is used to fill the empty space betweenthe lagging and rock surface.2.55 Pay Line (B Line) - An assumed line (beyond A-line) to whichpayment-of excavation is made whether the actual excavation falls insideor outside it. Sometimes B-line may merge with A-line.2.56 Permanent Supports - These are tunnel supports which are leftin place permanently.

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IS I 4410 ( Par t XX ) 19832.57 Pilot Tunnel - A tunnel smaller in section driven ahead of a maintunnel to determine its strata, grade and direction, and/or to facilitate theconstruction of main tunnel by enlargement method.2.58 Popping - Falling of thin slabs of rock suddenly detached after therock has been exposed in a tunnel.2.59 Portal - See 2.94.2.60 Power Tunne l - A tunnel for supplying water under pressure orfree flow to the penstocks or turbines.2.61 Pre-Splitting - Creating artificial crack along periphery of tunnelby drill ing hole at suitable spacing, leading alternative holes and blasting.2.62 Pressure Shaft - A ver ti ca l or inc lined shaf t designed to take uphigh pressures.2.63 Pressure Tunnel - A tunnel in which the water is under pressureand wets its entire perimeter.2.64 Primary Lining - A . concre te lining laid immediate ly afterexcavation and installation of steel supports. This may cover the fullsection excavated or part section depending on conditions of strata.2.65 Primer Cartridge - The explosive cartridge into which thedetonator has been inserted.2.66 Rib: Rib and Post or Rib, Post and Invert Strut - These arethe components of support system.2.67 Rock Bolts - Long steel bolts inserted into rock and concrete bywedging, by expanding sleeves or cementing to support laminated,partially detached or otherwise incompetent strata.2.68 Rock Burst - A sudden explosive detachment of a rock slab orrock mass from the arch, wall or invert of any underground opening.2.69 Rockcrete - A nearly dry mixture of sand, crushed rock, andcement sprayed on the arch and wall of a tunnel to provide support.2.70 Rock-Load - I t indicates the height of the mass of rock whichtends to exert pressure on the support.2.11 Scaling - An operation to remove all loose bits of rock from theblasted surface, after the blasting is over.

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IS : 4410 (Par t XX) - 19832.72 Shaft - A nearly vertical pit or well driven from surface to tunnelor gallery or any other underground opening.2.73 Shotcrete - Pnuematically applied mixture of cement, sand, waterand small coarse aggregate ( up to 10 mm) shot into place.2.74 Side Drift - Drift on the side of the tunnel.2.75 Skeleton Lagging - Lagging placed with interstices.2.76 Soffits - Under surface of the top of an arch.2.77 Soft Strata - Strata hav ing tensile and shearing strength farbelow than tha t of hard, firm rocks. The stand-up time of such strata islimited and consequently an opening excavated through them requiressupports to be installed within a short period of excavation.2.78 Soils - See IS: 1498-1970*.2.79 Spitting Rock - A rock mass under stress that breaks and ejectssmall fragments with considerable velocity.2.80 Spreader - Wood section placed between ribs to maintain tensionon tie rods or preserve alignment.2.81 Squeezing Rocks - Rock strata which due to inherent internalstresses, gradually squeezes into the excavated profile.2.82 Steming - The adding of inert materia l, such as rock dust, in' aborehole on top of an explosive to confine the energy of the explosion.2.83 Stopping - Operations for oyer head excavation by drilling froman underground face.2.84 Submerged Intake - An intake structure functioning entirelyunder water.2.85 Swelling Ground - Rock that swells after being exposed. Usuallyincreases in volume because of hydration of clay minerals in an alteredrock.2.86 Tail Race Tunne l - A tunnel conduct ing water released fromwater turbines to a suitable point for further disposal,2.87 Tempo ra ry Suppo rts - These are tunnel supports which areerected dur ing excavation and removed before erection of ei ther thepermanent lining or permanent supports.

Classification and identification of soil for general engineering purposes (firstrevision) .9

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IS : 4410 ( Par t XX ) 19832.88 Tight Lagging - Lagging without interstices.2.89 Top Heading - See 2.34.2.90 Transition - A length of tunnel wherein the cross-sectional shapeis gradual ly changed from that of the tunnel upstream to that of thetunnel downstream.2.91 TrilDlDer - Holes at the periphery of an excavation, fired to givethe excavation its final cutline,2.92 Truss Panel - Panel located on the spring line constituting atemporary support for ribs while taking ou t the bench and are replacedby posts in the final stage of erection. These serve a function similar toth at o f crown bars.2.93 Tunnel - A passage constructed underground through high groundor mountains, open at both ends so as to provide a path for a road,railway, water, sewage, etc.2.94 Tunnel Po r t a l - Structure built at the inlet (or entrance ) andoutlet ( or exit) of the tunnel.2.95 Tunnel Porta l Transitions - Structural arrangements at inletand outlet portals of the tunnel changing the shape of the flow area, toobtain desirable flow conditions.

2 . ~ 6 Tunnel Spillway - A tunnel used as a spi llway.2.97 Tunnel Spil lway Bucket - A device to deflect and spread thehigh velocity flow high in to the ai r and permit the dissipation of energyat a safe distance downstream from the tunnel outlet.2.98 Tunnel Support - Structure erected in the tunnel to support thestrata surrounding the excavated section.2.99 Valve Cha lDber or Valve House - A structure housing theregulating valves, control mechanism for operation of valves andequipment required to remove parts for repair, etc.2.1()0 Wall Plates - Sills for ribs for transmitting the load from ribsthrough blocks or posts to the rock.2.101 Wall Plate Drift - Drift at the spring l ine to insta ll wall plates.2.102 Weeper (Weep) - A pipe or drilled hole in rock or concretedesigned to relieve pressure of underground water on the tunnel lining."2.103 Wet Intake Tower - An intake tower which is filled with waterto the level of the source of supply.

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INDIAN STANDARDSONTERMINOLOGY RELATING TO RIVER VALLEY PROJECTS

IS:4410 Glossary of terms relating to river valley projects:

Part I Irrigation practicePart II Project planningPart III River and river trainingPart IV DrawingsPart V CanalsPart VI ReservoirsPart VII Engineering geologyPart VIII Dams and dam sectionsPart IX Spillways and syphonsPart X Civil works of hydro-electric generation system including water conductorsystemPart XI Hydrology, Section I General termsPart XI Hydrology, Section 2 Precipitation and ru n offPart XI Hydrology, Section 3 Infiltration and water lossesPart XI Hydrology, Secrion s HydrographsPart XI Hydrology, Section 5 FloodsPart XII Diversion worksPart XIV Soil conservation and reclamation, Section I Soil conservationPart XIV Soil conservation and reclamation, Section 2 ReclamationPart X V Canal structures, Section I General termsPart XV Canal structures, Section 2 TransitionsPart X V Canal structures, Section 3 FlumesPart XV Canal structures, Section e Regulating worksPart XV Canal structures, Section 5 Crou-drainage worksPart XVI Gates and valves, Section I GatesPart XVI Gates and valves, Section 2 ValvesPart XVII Water requirements of crops

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