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3D Numerical Simulation of the Interaction between Rock Mass and Shield TBM Passing through the Fault Fracture Zone
(1 China Construction Third Bureau Engineering Design, Co., Ltd, Wuhan 430074; 2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116)
Abstract TBM jamming may occur due to exceeded convergence of surrounding rock when a shield TBM passes through the fault fracture zone. Taking a water conveyance tunnel as the engineering background, the numerical simulation is conducted by FLAC3D to explore the changes of frictional resistance of TBM passing through the fault fracture zone and to analyze the influence of advance support strength and overcut gap on force applied on shield TBM and jamming risk. The simulation results show that the frictional resistance of TBM is the main control factor to cause the jamming of TBM passing through the fault fracture zone, the radial relative convergence of surrounding rock at the TBM shield is 0.16 m which exceeds reserved deformation value, the squeezing force and forward frictional resistance on shield are high with the maximum frictional resistance of 108.71 MN, and the maximum peripheral convergence declines by around 17.06% after supporting with anchor bolts, which means the anchor bolt support can significantly influence the peripheral deformation of surrounding rock in fault fracture zone.
Abstract：
TBM jamming may occur due to exceeded convergence of surrounding rock when a shield TBM passes through the fault fracture zone. Taking a water conveyance tunnel as the engineering background, the numerical simulation is conducted by FLAC3D to explore the changes of frictional resistance of TBM passing through the fault fracture zone and to analyze the influence of advance support strength and overcut gap on force applied on shield TBM and jamming risk. The simulation results show that the frictional resistance of TBM is the main control factor to cause the jamming of TBM passing through the fault fracture zone, the radial relative convergence of surrounding rock at the TBM shield is 0.16 m which exceeds reserved deformation value, the squeezing force and forward frictional resistance on shield are high with the maximum frictional resistance of 108.71 MN, and the maximum peripheral convergence declines by around 17.06% after supporting with anchor bolts, which means the anchor bolt support can significantly influence the peripheral deformation of surrounding rock in fault fracture zone.
XU Peng1 HUANG Jun1 ZHOU Jianbo1 TANG Jinzhou2
.3D Numerical Simulation of the Interaction between Rock Mass and Shield TBM Passing through the Fault Fracture Zone[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(6): 63-69
2020, Vol. 57 