Probabilistic tunnel face stability analysis: A comparison between LEM and LAM

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.4.399
Q. Pan, Zhiyu Chen, Yimin Wu, D. Dias, P. Oreste
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Abstract

It is a key issue in the tunnel design to evaluate the stability of the excavation face. Two efficient analytical models in the context of the limit equilibrium method (LEM) and the limit analysis method (LAM) are used to carry out the deterministic calculations of the safety factor. The safety factor obtained by these two models agrees well with that provided by the numerical modelling by FLAC 3D, but consuming less time. A simple probabilistic approach based on the Mote-Carlo Simulation technique which can quickly calculate the probability distribution of the safety factor was used to perform the probabilistic analysis on the tunnel face stability. Both the cumulative probabilistic distribution and the probability density function in terms of the safety factor were obtained. The obtained results show the effectiveness of this probabilistic approach in the tunnel design.
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隧道工作面稳定性概率分析:LEM与LAM的比较
开挖面的稳定性评价是隧道设计中的一个关键问题。采用极限平衡法(LEM)和极限分析法(LAM)两种有效的解析模型对安全系数进行确定性计算。两种模型得到的安全系数与FLAC 3D数值模拟结果吻合较好,但耗时较短。采用基于蒙特卡罗模拟技术的简单概率方法,快速计算安全系数的概率分布,对巷道工作面稳定性进行了概率分析。得到了用安全系数表示的累积概率分布和概率密度函数。计算结果表明了该概率方法在隧道设计中的有效性。
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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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