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Numerical Simulation for Tunnel of Changde-Jishou Express Highway Based on Considering Seepage Effect

TIAN Kun1,HUANG Bing-ren2,WANG Rui1(1.College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan,Hu'nan 411105,China;2.College of Resources and Safety Engineering,Central South University,Changsha,Hu'nan 410083,China)  
Pointing to the Bimaxi twin-arched tunnel of Changde-Jishou Express Highway and by using the FLAC3D software,the three-dimensional numerical analysis for the surrounding rock of the tunnel is carried out under two kinds of conditions of considering and unconsidering the seepage effect of water.And the changes of the stress field and bias field of the surrounding rock of the tunnel under two kinds of conditions and with the staged excavation are obtained as well as the stability analysis of the surrounding rock.The conclusion indicates that the stress of the surrounding rock of the tunnel when considering the seepage effect is lower than that when unconsidering;the vertical displacement of the surrounding rock when considering the seepage effect is much bigger than that when unconsidering,but the difference of the horizontal displacement under two kinds of conditions is a little;and the stability of the surrounding rock when considering the seepage effect is worse than that when unconsidering.The conclusions will provide references for the construction and design of the seepage control of the tunnel.
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