Sensitivity analyses of random cave groups on karst tunnel stability based on water–rock interaction using a novel contact dynamic method

IF 8.2 1区工程技术 Q1 ENGINEERING, CIVIL

Underground Space Pub Date : 2024-03-12 DOI:10.1016/j.undsp.2023.11.017

Chengzhi Xia, Zhenming Shi, Huanjia Kou, Shaoqiang Meng, Maomao Liu

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引用次数: 0

Abstract

This paper concentrates on the sensitivity and dynamic simulation of randomly distributed karst cave groups on tunnel stability and connectivity extended ratio based on water–rock interaction using a novel contact dynamic method (CDM). The concept of karst cave group connectivity extended ratio during tunneling and water inrush is proposed. The effects of cave shape and spatial distribution on Qiyueshan tunnel are investigated. Tunnel deformation and damage index, and connectivity extended ratio with uniform random karst cave groups are evaluated. The results demonstrate that the connectivity extended ratio is verified as a crucial judgment in predicting the safe distance and assessing the stability of the tunnel with the karst cave group. CDM model captures the fracture propagation and contact behavior of rock mass, surface flow, as well as the bidirectional water–rock interaction during the water inrush of Qiyueshan tunnel with multiple caves. A larger cave radius and smaller minimum distance between the cave and tunnel increase the deformation and damage index of the surrounding rock. When the cave radius and cave area ratio increase, the failure pattern shifts from overall to local failure. These findings potentially have broad applications in various surface and subsurface scenarios involving water–rock interactions.

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基于水-岩相互作用的随机洞穴群对岩溶隧道稳定性的敏感性分析（采用新型接触动力学方法

本文采用新型接触动力学方法（CDM），基于水岩相互作用，集中研究了随机分布的岩溶洞穴群对隧道稳定性和连通扩展率的敏感性和动态模拟。提出了掘进和涌水过程中岩溶洞穴群连通扩展比的概念。研究了溶洞形状和空间分布对齐岳山隧道的影响。评价了隧道变形和破坏指数，以及均匀随机岩溶洞穴群连通扩展比。结果表明，连通扩展比是预测岩溶洞穴群隧道安全距离和评估隧道稳定性的关键判断指标。CDM 模型捕捉了七月山隧道多溶洞涌水过程中岩体的断裂传播和接触行为、地表流动以及水岩双向相互作用。较大的溶洞半径和较小的溶洞与隧道最小间距会增加围岩的变形和破坏指数。当溶洞半径和溶洞面积比增大时，破坏模式将从整体破坏转变为局部破坏。这些发现可能会在涉及水岩相互作用的各种地表和地下场景中得到广泛应用。

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.