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Numerical Simulation of Ground Subsidence Induced by Shield Tunnel Construction Disturbance in Water-rich Sandy Stratum
(1 Key Laboratory of Geotechnical and Underground Engineering(Tongji University), Ministry of Education, Shanghai 200092;2 Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092; 3 Shanghai Geological& Mineral Engineering Investigation Co.,Ltd., Shanghai 200072)
Abstract Through a three-dimensional elastoplastic numerical simulation of the working face of a shield tunnel, it
studies the characteristics of ground subsidence induced by support pressure change and ground loss, analyzes the effect of changes of soil mass parameters and ground water seepage on ground subsidence. The simulation results show that the seepage will significantly increase the support pressure required to maintain the stability of tunnel working face, the magnitude and scope of ground subsidence, and change the pattern of ground subsidence; when the support pressure approaches the limit value, the ground deformation at the top of the tunnel increases sharply;soil deterioration results in increase of ground deformation, and the soil deterioration will have more significant impact on the ground deformation when the supporting pressure approaches the limit value; due to the effect of ground loss, the deformation at the plane on tunnel top is the largest, and the deformation decreases gradually towards the ground surface.
Abstract：
Through a three-dimensional elastoplastic numerical simulation of the working face of a shield tunnel, it
studies the characteristics of ground subsidence induced by support pressure change and ground loss, analyzes the effect of changes of soil mass parameters and ground water seepage on ground subsidence. The simulation results show that the seepage will significantly increase the support pressure required to maintain the stability of tunnel working face, the magnitude and scope of ground subsidence, and change the pattern of ground subsidence; when the support pressure approaches the limit value, the ground deformation at the top of the tunnel increases sharply;soil deterioration results in increase of ground deformation, and the soil deterioration will have more significant impact on the ground deformation when the supporting pressure approaches the limit value; due to the effect of ground loss, the deformation at the plane on tunnel top is the largest, and the deformation decreases gradually towards the ground surface.
LV Xilin1,
2 ZHAO Yucheng1,
2 CAI Jiantao3
.Numerical Simulation of Ground Subsidence Induced by Shield Tunnel Construction Disturbance in Water-rich Sandy Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(5): 104-109
2020, Vol. 57 