Flexible Temporary Shield in Soft and Sensitive Clay: 3D FE Modelling of Experimental Field Test

IF 0.8 Q3 ENGINEERING, MULTIDISCIPLINARY

Modelling and Simulation in Engineering Pub Date : 2021-02-25 DOI:10.1155/2021/6626750

Miah Alam, O. Chaallal, B. Galy

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引用次数: 4

Abstract

A finite-element (FE) numerical study using PLAXIS-3D software was carried out to reproduce and validate a full-scale experimental in situ test and to investigate the earth pressure on a flexible temporary trench box shield in soft and sensitive clay soil. The excavation trench model was 6 m (20 ft) deep and was considered as nonlinear and anisotropic clay. A 45 kPa (0.94 ksf) surface overload on top of the soil near the trench box was also simulated to produce a maximum load case on the flexible wall of the shield. Both Mohr-Coulomb (MC) and hardening soil (HS) constitutive soil models were considered for FE analysis. Different values of the modulus reduction factor (MRF) and the coefficient of earth pressure at rest ( K 0 ) were considered to validate the model. For a specific shear strength profile, FE analysis with a linear elastoplastic soil model showed relatively small differences in soil pressure with the field test results along the depth of the trench. Results were also compared with the predictions of well-established analytical formulae.

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软敏感黏土柔性临时盾构:现场试验三维有限元模拟

利用PLAXIS-3D有限元软件对软敏感粘土中柔性临时沟箱盾构土压力进行了数值模拟和验证。挖掘壕模型为6 m (20 ft)深，被认为是非线性和各向异性粘土。此外，还模拟了壕箱附近土壤顶部45 kPa (0.94 ksf)的表面过载，以产生盾构柔性壁上的最大载荷情况。采用Mohr-Coulomb (MC)和硬化土(HS)两种土本构模型进行有限元分析。采用不同的模量折减系数(MRF)和静土压力系数(k0)对模型进行验证。对于特定的抗剪强度剖面，采用线性弹塑性土模型的有限元分析表明，沿沟槽深度，土压力与现场试验结果差异较小。结果还与已建立的分析公式的预测结果进行了比较。

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

Modelling and Simulation in Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

2.70

自引率

3.10%

发文量

审稿时长

18 weeks

期刊介绍： Modelling and Simulation in Engineering aims at providing a forum for the discussion of formalisms, methodologies and simulation tools that are intended to support the new, broader interpretation of Engineering. Competitive pressures of Global Economy have had a profound effect on the manufacturing in Europe, Japan and the USA with much of the production being outsourced. In this context the traditional interpretation of engineering profession linked to the actual manufacturing needs to be broadened to include the integration of outsourced components and the consideration of logistic, economical and human factors in the design of engineering products and services.