Analysis of Ground Deformation and Failure Induced by Shallow Tunneling with Cavity in the Overlying Strata

被引：0

作者：

Cai Y. ^{[1
,2
]}

Zhang C. ^{[1
,2
]}

Min B. ^{[1
,2
]}

机构：

[1] Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing

[2] School of Civil Engineering, Beijing Jiaotong University, Beijing

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2019年 / 41卷 / 09期

关键词：

Ground cavities; Ground deformation; Model test; Numerical simulation; Shallow metro tunnel;

D O I：

10.3969/j.issn.1001-8360.2019.09.016

中图分类号：

学科分类号：

摘要：

The existence of ground cavities can have an adverse effect on the integrity of rock mass. Under the influence of shallow tunneling, the ground with cavities is susceptible to instability, which can directly induce the ground surface collapse. Based on the shallow metro tunnel in urban area with cavity above it, model tests and numerical simulations were performed to study the influence of the cavity size and the distance between tunnel and cavity on stratum deformation. The results of numerical simulations indicate that the existence of the cavity leads to the increase of ground surface settlement. The larger the cavity size and the smaller the distance between tunnel and cavity, the larger the influence on the ground surface settlement is. For the large size cavity, a critical net distance exists between the tunnel and the cavity. Before the net distance between the tunnel and the cavity reaches the critical value, the ground surface settlement decreases with the increase of the net distance. When the net distance is greater than the critical value, the ground surface settlement increases slowly with the increase of the distance. The critical distance decreases with the increase of the cavity size. For the small size cavity, with the increase of net distance, the ground surface settlement decreases gradually. The overall instability due to the plastic zone connection between tunnel and cavity and the partial instability due to the plastic zone development to the ground surface are the two typical failure modes. The effect of the net distance between tunnel and cavity on the surface settlement obtained by model tests agrees well with the results of numerical simulations, which shows the reliability of the model tests. The results obtained in this study may provide useful reference for studying the deformation control technologies of tunneling in the ground with cavities. © 2019, Department of Journal of the China Railway Society. All right reserved.

引用

页码：118 / 128

页数：10

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