Study on Excavation Surface Stability of Shield Tunnel

10.6919/ICJE.202205_8(5).0029

Jie Jiang；Wenli Lv；Liang Liu；Xinyu Liu

Tunnel Engineering ； Triaxial Test ； Finite Difference Method ； Numerical Simulation ； Excavation Surface Deformation

International Core Journal of Engineering

8卷5期（2022 / 05 / 01）

229 - 246

英文

It is of great significance to predict and control the stability of excavation surface for the safety of tunnel construction. Combining with the condition of shield tunnel engineering instance data, through gravel soil in triaxial test on the spot to determine the soil strength index, and based on the test results using the finite difference method to simulate the tunnel excavation process, the results show that the excavation face failure occurs, damage zone funnel shaped to expand the earth's surface, area of disturbance increase with the decrease of the buried depth of tunnel; When the support force decreases, the deformation of the excavation surface increases gradually, and the maximum horizontal displacement shifts to the lower part of the excavation surface. The ultimate support stress ratio and ultimate support force of excavation face decrease with the increase of tunnel depth, and gradually converge. Reasonable numerical simulation is helpful to predict and control the stability of excavation surface during shield construction.

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