Dynamic collapse characteristics of the tunnel face induced by the shutdown of earth pressure balance shields (EPB): A 3D material point method study

IF 8.2 1区工程技术 Q1 ENGINEERING, CIVIL

Underground Space Pub Date : 2023-12-15 DOI:10.1016/j.undsp.2023.11.001

Shuying Wang , Tingyu Liu , Xiangcou Zheng , Junsheng Yang , Feng Yang

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引用次数: 0

Abstract

The collapse of the tunnel face is a prevalent geological disaster in tunnelling. This study employs a three-dimensional (3D) material point method (MPM) to simulate the dynamic collapse process and post-failure mechanisms of the tunnel face. The specific focus is on the scenario where the auxiliary air pressure balanced shield with a partially filled chamber is shut down. To assess the suitability of the 3D MPM, numerical solutions are compared with the results from small-scale experimental tests. Subsequently, a series of large-scale numerical simulations is conducted to explore the dynamic collapse characteristics of the tunnel face induced by the shutdown of the EPB shield under various support air pressures and cutter head conditions. The temporal evolution of the accumulated soil masses in the soil chamber and ground responses under different support air pressures, cutter head types and opening ratios are discussed. In particular, the associated surface subsidence due to the tunnel face collapse is determined and compared with empirical solutions. Numerical results confirm the applicability of the 3D MPM for simulating the large-scale tunnel face collapse scenarios, spanning from small to large deformation analysis.

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土压平衡盾构（EPB）关闭引起的隧道面动态坍塌特征：三维材料点法研究

隧道工作面坍塌是隧道工程中普遍存在的地质灾害。本研究采用三维（3D）材料点法（MPM）模拟隧道工作面的动态坍塌过程和坍塌后机理。具体重点是关闭带有部分填充腔的辅助气压平衡盾构的情况。为了评估 3D MPM 的适用性，将数值解决方案与小规模实验测试结果进行了比较。随后，进行了一系列大规模数值模拟，以探讨在各种辅助气压和刀头条件下，EPB 护盾关闭所引起的隧道面动态坍塌特征。讨论了不同支撑气压、刀头类型和开口率下土室中累积土块的时间演变和地面响应。特别是，确定了隧道面塌陷引起的相关地表下沉，并与经验解法进行了比较。数值结果证实了三维 MPM 适用于模拟大规模隧道工作面坍塌情况，包括从小到大的变形分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Underground Space ENGINEERING, CIVIL-

CiteScore

10.20

自引率

14.10%

发文量

审稿时长

63 days

期刊介绍： Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.