Analysis of face stability for a shield tunnel in the inclined strata with soft upper and hard lower layers

IF 6.2 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Xiaopu Cui , Pengfei Li , Yang Chen , Fei Jia , Zhaoguo Ge , Shaohua Li
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引用次数: 0

Abstract

Tunnel excavation often encounters inclined strata with a soft upper layer and a hard lower layer at the excavation face. Currently, limited research has been conducted on the mechanisms underlying the instability of such strata. This paper proposes a new excavation face failure mechanism considering the inclination angle and soil arching effect, and classify the failure models into two types according to the inclination angle. The results of numerical simulations and existing theories are used to validate our model. Through sensitivity analysis of soil strength parameters, the analytical results indicate that as the inclination angle changes from counterclockwise to clockwise, the limit support pressure first decreases, then increases, and then gradually decreases. The internal friction angle of the inclined strata significantly affects the limit support pressure. The influence of cohesion difference on the limit support pressure gradually weakens. Under clockwise inclination angles, the limit support pressure mainly depends on the strength parameters of the upper layer. This paper provides a more accurate theoretical basis for the stability analysis of shield tunnels in inclined strata with soft upper and hard lower layers, which is of great significance for guiding the design and construction of shield tunnels in complex geological conditions.
上软下硬倾斜地层盾构隧道工作面稳定性分析
隧道开挖在开挖工作面经常遇到上软下硬的倾斜岩层。目前,对此类地层失稳机理的研究有限。本文提出了一种考虑倾角和土拱效应的开挖工作面破坏机制,并按倾角将破坏模式分为两类。利用数值模拟结果和现有理论对模型进行了验证。通过对土体强度参数的敏感性分析,分析结果表明,随着倾角由逆时针方向向顺时针方向变化,极限支护压力先减小后增大,再逐渐减小。倾斜岩层的内摩擦角对极限支护压力有显著影响。黏聚力差对极限支护压力的影响逐渐减弱。顺时针倾角下,极限支护压力主要取决于上层的强度参数。本文为上软下硬倾斜地层盾构隧道的稳定性分析提供了更为准确的理论依据,对指导复杂地质条件下盾构隧道的设计与施工具有重要意义。
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
alexandria engineering journal
alexandria engineering journal Engineering-General Engineering
CiteScore
11.20
自引率
4.40%
发文量
1015
审稿时长
43 days
期刊介绍: Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering
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