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| Study and Prediction of Surface Settlement in Xi’an Subway during Shield Construction Based on Stochastic Medium Theory |
| GU Shuan-cheng,LI Min |
| Xi’an University of Science and Technology,Xi’an,Shanxi 710054,China |
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Abstract Research purposes：For the problem of calculated the cross—section convergence when use the stochastic medium theory to predict the surface subsidence induced by shield construction,on the basis of consideration of shield construction technology,combined with the engineering geological conditions,this paper uses the theory of elastic mechanics knowledge to calculate the parameters needed for the stochastic medium theory to predict the surface subsidence.The purpose is that can quantify the parameters of section convergence and optimize the factors which affect convergence value when use the stochastic medium theory to predict the surface subsidence. Research conclusions：Through the analysis of surface settlement of Xi hn subway tunnel induced by shield construction,the results show that：(1)Among these three factors which affect ground settlement,the influence of eccentric overbreak is the most and is the most difficult to contr01.(2)The key factor to control the ground settlement is controlling convergence deformation which caused by stress release in shield machine tail,and in the range of elastic deformation,increasing grouting pressure properly can control section convergence value and reduce ground settlement.(3)The predicted results of surface subsidence which are got from the method for calculating convergence value of section in this paper and stochastic medium theory are matched well with the actual results.And it will provided a certain theoretical basis to develop the control measures for reduced ground surface subsidence by shield construction in the compact structure of soil mass and high strength of loess strata.
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Received: 12 September 2013
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2014, Vol. 31 
