国际会议汇报ppt英文.ppt

•Safety management in tunnel construction: Case study of Wuhan metro construction• in China•Author： MiroslawJ. Skibniewski• Lieyun Ding, et al•Reporter: Wu Tong-gang•Central South University•New wordsShaft:￿通风井Grouting:￿灌浆，给…灌浆High-pressure￿jet￿grouting￿piles(HJGP):￿高压喷射灌浆柱Silty￿clay:￿粉质黏土Tunnel￿boring￿machine(TBM):￿隧道掘进机Gush:￿涌出Double-spool:￿双轴•Outline•PART 1 Introduction •PART 2 Method•PART 3 Results•PART 4 Conclusion•Introduction •1•1.1 Background Shield tunneling technologyAdvantages Disadvantages 1. High level of mechanization1. Large scale 2. Fast progression of tunneling works2. Long duration3. Lesser environmental impact3. Complex technical issues•1.2 Objective The primary aims of this study were to investigate:Overall Process Safety Management (OPSM) in tunnel construction.iiiiA real-time update of both environmental parameters and control measures.iiA more reasonable solution for the waterproofing and reinforcing works.•1.3 Project profileWuhan Yangtze Metro Tunnel (WYMT)Characteristics:1. Double-spool tunnel connecting two large cities2. Two sets of ventilation shafts3. A curve radius of 350m and an extremely close distance away from Yangtze River4. Fine sandstone and silty clay•Method •2Waterproofing Ground freezingLowering of water level methodReinforcing 1.￿The￿cement￿paste￿tends￿to￿be￿washed￿away￿by￿the￿flowing￿water,￿resulting￿in￿poor￿reinforcement.A high-pressure jet grouting•2.1 Safety system design2.￿No￿significant￿waterproofing￿results￿would￿be￿achieved￿due￿to￿the￿close￿proximity￿to￿the￿Yangtze￿River.•2.1 Safety system designGround heterog-eneityConstru-ction methodsSoil structure interact-ionNon-linear behavior of soils•2.2 Safety analysisSystemic￿safetyEconomic￿requirementsNumerical￿simulationANSYS•2.3 Safety control process2.3.1￿Reinforcement￿controlItems Checking methodsChecking criteriaReinforced soil strengthDrill to obtain two cores on each side deep into the excavation bottom five miles away from the tunnel axis, and then conduct the core test. >=1 Mpa Reinforced soil permeabilityDrill four holes well-distributed around the excavation region, and then test the permeability of each hole. <=1 m3/d Reinforced soilhomogeneity Drill to obtain four cores well-distributed around the excavation region, and then test the homogeneity of each core. Uniformity •2.3 Safety control process2.3.2￿Freezing￿controlLayout￿of￿freezing￿holesWorkers￿are￿examining￿the￿freezing￿effect.•2.3 Safety control process2.3.3￿UCW￿removing￿controlWorkers￿are￿cutting￿down￿the￿steel￿within￿UCW.Workers￿are￿pasting￿quilts￿onto￿the￿workface￿of￿the￿tunnel￿portal.•Results •3•3 Results •3 Results abca:￿Distribution￿of￿compressive￿stressb:￿Distribution￿of￿tensile￿stressc:￿Distribution￿of￿shear￿stress•Conclusion•4•Conclusion1Treat￿schemes￿for￿waterproofing￿and￿reinforcing￿works2 Boring￿attitude￿control￿of￿TBM3Numerical￿analysesCombine￿freezing￿method￿and￿HJGPInclude￿the￿preliminary￿Include￿the￿preliminary￿deviation￿ahead￿of￿the￿deviation￿ahead￿of￿the￿drilling￿processdrilling￿processApply￿numerical￿simulation￿by￿ANSYS•Question-inviting•5•LOGO •HERE•THANK•YOU!•PRESENTED￿BY￿WuTong-gang。