国际会议汇报ppt英文.pptx

Safety management in tunnel construction:Case study of Wuhan metro construction in ChinaAuthor：MiroslawJ.Skibniewski Lieyun Ding,et alReporter:Wu Tong-gangCentral South UniversityNew 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OutlinePART 1 Introduction PART 2 MethodPART 3 ResultsPART 4 ConclusionIntroduction 11.1 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 issues1.2 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 clayMethod 2Waterproofing 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 grouting2.1 Safety system design2.No significant waterproofing results would be achieved due to the close proximity to the Yangtze River.2.1 Safety system designGround heterog-eneityConstru-ction methodsSoil structure interact-ionNon-linear behavior of soils2.2 Safety analysisSystemic safetyEconomic requirementsNumerical simulationANSYS2.3 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 33 Results 3 Results abca:Distribution of compressive stressb:Distribution of tensile stressc:Distribution of shear stressConclusion4Conclusion1Treat 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 ANSYSQuestion-inviting5LOGO HERETHANKYOU!PRESENTED BY WuTong-gang