国际会议汇报(英文)(课堂PPT).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 words,Shaft:,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 technology,Advantages,Disadvantages,1.High level of mechanization,1.Large scale,2.Fast progression of tunneling works,2.Long duration,3.Lesser environmental impact,3.Complex technical issues,1.2 Objective,The primary aims of this study were to investigate:,Overall Process Safety Management(OPSM)in tunnel construction.,i,iii,A real-time update of both environmental parameters and control measures.,ii,A more reasonable solution for the waterproofing and reinforcing works.,1.3 Project profile,Wuhan Yangtze Metro Tunnel(WYMT),Characteristics:,Double-spool tunnel connecting two large cities,Two sets of ventilation shafts,A curve radius of 350m and an extremely close distance away from Yangtze River,4.Fine sandstone and silty clay,Method,2,Waterproofing,Ground freezing,Lowering of water level method,Reinforcing,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 design,2.No significant waterproofing results would be achieved due to the close proximity to the Yangtze River.,2.1 Safety system design,Ground heterog-eneity,Constru-ction methods,Soil structure interact-ion,Non-linear behavior of soils,2.2 Safety analysis,Systemic safety,Economic requirements,Numerical simulation,ANSYS,2.3 Safety control process,2.3.1 Reinforcement control,Items,Checking methods,Checking criteria,Reinforced soil strength,Drill 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 permeability,Drill four holes well-distributed around the excavation region,and then test the permeability of each hole.,=,1 m,3,/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 process,2.3.2 Freezing control,Layout of freezing holes,Workers are examining the freezing effect.,2.3 Safety control process,2.3.3 UCW removing control,Workers are cutting down the steel within UCW.,Workers are pasting quilts onto the workface of the tunnel portal.,Results,3,3 Results,3 Results,a,b,c,a:Distribution of compressive stress,b:Distribution of tensile stress,c:Distribution of shear stress,Conclusion,4,Conclusion,1,Treat schemes for waterproofing and reinforcing works,2,Boring attitude control of TBM,3,Numerical analyses,Combine freezing method and HJGP,Include the preliminary deviation ahead of the drilling process,Apply numerical simulation by ANSYS,Question-inviting,5,LOGO,HERE,THANK,YOU!,PRESENTED BY WuTong-gang,