1、Safety management in tunnel construction:#Case study of Wuhan metro construction in China,Author:#MiroslawJ.Skibniewski Lieyun Ding,et alReporter:#Wu Tong-gangCentral 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 mac
2、hine(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,1.2 Objective,1.3 Project profile,Wuhan Yangtze Metro Tunnel(WYMT),Characteristics:#Double-spool tunnel connecting two large c
3、ities Two sets of ventilation shafts A curve radius of 350m and an extremely close distance away from Yangtze River4.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,resulti
4、ng 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 behavi
5、or of soils,2.2 Safety analysis,Systemic safety,Economic requirements,Numerical simulation,ANSYS,2.3 Safety control process,2.3.1 Reinforcement control,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
6、.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 stressb:#Distribution of tensile stressc:#Distribution of shear stress,Conclusion,4,Conclusion,Combine freezing method and HJGP,Include the preliminary deviation ahead of the drilling process,Apply numerical simulation by ANSYS,Question-inviting,5,LOGO HERE,THANKYOU!#,PRESENTED BY WuTong-gang,
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