8/13/2019 Tunnel Management Process_dec 2013

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IDENTIFY & DESIGNPROTECTION WORK

BUILDING RISK ASSESSMENTS &PROTECTION PLANS. AllowableLimits of Deformation

ALIGNMENT OF RAILTRACK & STATIONLOCATION

INSTRUMENTATIONDESIGN

SETTLEMENT ANALYSISGround loss, shield loss,tailskin loss, sensitivity

TBM OPERATIONAL PARAMETERS &RANGE -Face Pressure, grout

pressure/volume

SURVEYS FOR UTILITIES, ID NAOF MATERIAL & ALLOWABLELIMITS OF DEFORMATION

GEOLOGICPARAMETE

BUILDING CONDITION SURVEYS,STRUCTURAL SURVEYS,

SAFE TUNNELLING

Controlled settlement, minimal impact oninfrastructure, optimised face pressures,

controlled progress

CONSTRUCTIONTunnelling

TBM OperationFace pressure,Grouting Volume & PressureMuck VolumeThrustTorqueSpeed of AdvanceSteering / Survey Control

Lining ErectionBuild Quality / ReparsAlignment

Ground TreatmentDrillingGroutingVerification

Immediate ActionsAlarm PlansStandard Operating ProceduresEmergency Plans

DESIGN OF TUNNEL ADVANCEHorizontal & Vertical Alignment - deeper tunnels have greater pressures, tight curve

Geotechnical Interpretation - possible geological hazards, mixed face conditions,

Face Pressures - control of face pressure to avoid stress relaxation & oveWeights / Volumes - assessment of weight based on range of in-situ density, assess likelInstrument Plan - types & distribution of instruments based on predicted settlements and location o

Settlement Contours & Settlement Limits - assessment of extent of predicted settlement, alloconstruction

Required Consolidation Works - building protection worked to prevent any adverseHigh Risk Areas, Structures & utilities- indicated on drawings to advise of ad

Anticipated Anomalies & Actions - Loss of face pressure, additional grouProbing - predicted geology, tates of penetration

TUNNEL MANAGEMENT PROCESS

DESIGN INPUT

DESIGN PROCESS

DESIGN OUTPUT

CONSTRUCTION INPUT

CONSTRUCTION PROCESS

CONSTRUCTION OUTPUT

TBM - GROUND INTERACTION Compliance with settlement limits

Compliance with Face Pressure & Groutrequirements

Compliance with alignment

TBM Design

ALIGNMENT

VALIDATION -Wriggle survey

ALIGNMENT

VERIFICATION - Track WorkValidation

CONFIRM

ALIGNMENT - Designmodifiaction may benecessary, signalling,route restrictions.