开挖非均匀土隧道时,刀盘开口率对土拱效应和工作面稳定性的影响

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL Underground Space Pub Date : 2023-12-28 DOI:10.1016/j.undsp.2023.11.003
Xue-Jian Chen , Pei-Pei Fang , Qiu-Nan Chen , Jun Hu , Kai Yao , Yong Liu
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引用次数: 0

摘要

隧道挖掘已日益成为探索地下空间的重要工具。一个典型的施工问题是隧道开挖过程中的工作面失稳,这对相关基础设施构成了巨大威胁。隧道工作面失稳通常与土拱坍塌同时发生。本研究通过随机有限元分析和蒙特卡洛模拟,研究了刀盘开口率和土壤不均匀性对土壤起拱效应和工作面稳定性的综合影响。结果表明,工作面稳定性与应力拱的演变密切相关。所得的均匀土稳定系数可作为实际隧道工程中支护压力设计的参考。此外,非均匀土的稳定系数低于均匀土,这意味着后者可能低估了工作面破坏的概率。如果忽略土壤的空间不均匀性,隧道工作面的破坏概率将超过 50%。最后,建立了一个实用框架,以确定安全系数(FOS),该安全系数对应于在非均匀土壤中考虑各种开口率的不同水平的工作面破坏概率。所需的安全系数为 1.70,以限制工作面失稳概率不超过 0.1%。我们的研究结果有助于在传统的确定性工作面压力设计中预测失稳概率。
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Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils

Tunnelling has increasingly become an essential tool in the exploration of underground space. A typical construction problem is the face instability during tunnelling, posing a great threat to associated infrastructures. Tunnel face instability often occurs with the soil arching collapse. This study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability, via conducting random finite-element analysis coupled with Monte–Carlo simulations. The results underscore that the face stability is strongly associated with the evolution of stress arch. The obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling engineering. In addition, non-uniform soils exhibit a lower stability factor than uniform soils, which implies that the latter likely yields an underestimated probability of face failure. The tunnel face is found to have a probability of failure more than 50% if the spatial non-uniformity of soil is ignored. In the end, a practical framework is established to determine factor of safety (FOS) corresponding to different levels of probability of face failure considering various opening ratios in non-uniform soils. The required FOS is 1.70 to limit the probability of face instability no more than 0.1%. Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure.

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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
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.
期刊最新文献
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