Sensitivity analysis of mechanical parameters to surrounding-soil response induced by shield tunneling considering spatial variability
LI Jianbin1，2，3，4，CHEN Jian1，2，3，4，CHENG Hongzhan5，ZHANG Shankai1，2，WU Jiaming1，2，HU Zhifeng1，2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Hubei Key Laboratory of Geo-Environmental Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；4. The Soft Soil Research Center in Ningbo University of Technology，State Key Laboratory of Geomechanics and Geotechnical Engineering，Ningbo，Zhejiang 315211，China；5. College of Civil Engineering，Hunan University，Changsha，Hunan 410082，China)
Abstract：Stochastic calculations，by combining the random field theory and the finite difference analysis together with Monte Carlo simulation，are used to carry out the sensitivity analysis of spatial variability of soil parameters to surrounding-soil response induced by tunneling. The effects of coefficients of variation(COV) of Young?s modulus(E)，Poisson?s ratio( )，cohesion(c) and friction angle( ) on the surrounding-soil response were investigated and discussed in detail. Results show that the main influence factors on surrounding-soil response are arranged in the order of spatial variability of internal friction angle，Young?s modulus，cohesion and Poisson?s ratio. The higher the variation level of the parameters，the greater the sensitivity of the parameters. Additionally，the influence of spatial variability of Poisson?s ratio on surrounding-soil response can be neglected in stochastic analysis. The influence of cohesion can be considered comprehensively according to the variation level.
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2019, Vol. 38 
