Upper bound limit analysis of blow-out failure mode of excavation face of shield tunnel considering groundwater seepage

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.26.3.227
F. Huang, Di Wang, N. Xiao, Ruo-chen Ou
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引用次数: 1

Abstract

The study of failure mode for the soil in front of a shield tunnel face is a key challenge for tunnel engineering, especially when drilling under the water table. This work aims to study face stability of a shield tunnel under the water table based on an blow-out failure mechanism in the framework of the upper bound theorem of limit analysis in conjunction with variational principle. The seepage force in the seepage field is derived, and seepage force is regarded as an external force which is introduced in the upper bound calculation. Based on the failure characteristic of the blow-out failure for the soil in front of a shield tunnel face, a upper bound failure mechanism is constructed. Using this mechanism, the equation of the failure surface is obtained and the shapes of the failure surfaces for different parameters are plotted. By studying the influence of various parameters on the shape of failure surfaces, the changing laws of the shape of the failure surface for different parameters are obtained.
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考虑地下水渗流的盾构隧道开挖面井喷破坏模式上限分析
盾构隧道工作面前土体破坏模式的研究是隧道工程,特别是地下水位下开挖时面临的关键挑战。本文在极限分析上界定理的框架下,结合变分原理,对地下水位下盾构隧道井喷破坏机理进行了研究。推导了渗流场中的渗流力,并将渗流力作为一种外力引入上界计算。根据盾构隧道工作面前土体爆破破坏的破坏特点,建立了上边界破坏机制。利用该机理,得到了破坏面方程,并绘制了不同参数下的破坏面形状。通过研究各种参数对破坏面形状的影响,得到了不同参数下破坏面形状的变化规律。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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