Abstract

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Title:: Based on extension of stochastic medium theory prediction model forsurface subsidence induced by tunnel construction

Author(s):: SHAO Zhushan1; 2; ZHAO Xin1; 2; (1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China;2. Shaanxi Key Lab of Geotechnical and Underground Space Engineering, Xi’an University ofArchitecture and Technology, Xi’an 710055, Shaanxi, China)

Keywords:: tunnel engineering; prediction model; stochastic medium theory method; surface subsidence induced by construction; numerical simulation

Abstract:: In order to have an accurate and reasonable prediction of the surface displacement and deformation generated in the process of tunnel excavation, the nonuniform convergence prediction model under different crosssection forms of tunnel was derived based on the random medium theory. The measured settlement value, the parallel annealing genetic algorithm was used to optimize the complex nonlinear problem of the main parameter’s identification in the model. The prediction model of horseshoe tunnel was verified based on the tunnel project between Ecity Station to Dongyi Road Station of Xi’an Metro Line 8, the finite element model was established by MIDAS/GTSNX, and the prediction results of the model and the numerical calculation values were compared. The prediction model of circular tunnel was verified by the actual monitoring value of the entrance surface of the left line of the Mulingguan Tunnel. The results show that when the model in this paper is applied, the top convergence value and bottom convergence value of the horseshoeshaped crosssection tunnel in the geological conditions of the region are 26.14 and 7.28mm, respectively. The prediction model of the entrance surface of the left line of the Mulingguan Tunnel is in good agreement with the actual law. 5 tabs, 7 figs, 30 refs.