深基坑地面沉降的弹塑性本构模型

IF 0.7 Q4 MECHANICS Studia Geotechnica et Mechanica Pub Date : 2023-09-01 DOI:10.2478/sgem-2023-0011
Hiba El-Arja, Sébastien Burlon, Emmanuel Bourgeois
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引用次数: 0

摘要

深基坑开挖引起的地面运动可能对邻近既有建筑造成破坏。一般来说,有限元模拟对挡土墙的水平位移给出了可以接受的估计,但对结构后面地面的垂直位移的结果却不太令人满意。一个可能的解释是,大多数本构模型以一种简化的方式描述体积应变。本文提出了一种弹塑性本构模型,旨在改进挡土墙后竖向位移的预测。该模型包括具有各向同性应变硬化的单一塑性机制,但具有允许产生收缩塑性应变的特定流动规则。通过一个标定实例,说明了基于三轴试验的参数识别方法。在Hochstetten(德国)提出了一个有充分记录的砂板桩墙的数值分析。将该模型的计算结果与实测结果以及硬化土模型的计算结果进行了比较。然后讨论了所提出模型的潜在优点。
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An elastoplastic constitutive model for assessing ground settlements induced by deep excavations
Abstract Ground movements induced by deep excavations may cause damages on neighboring existing buildings. Finite element simulations generally give acceptable estimates of the horizontal displacements of the retaining wall, but results are less satisfactory for the vertical displacements of the ground surface behind the structure. A possible explanation is that most constitutive models describe volumetric strains in a simplified way. This paper proposes an elastoplastic constitutive model aimed at improving the prediction of vertical displacements behind retaining walls. The model comprises a single plastic mechanism with isotropic strain hardening, but has a specific flow rule that allows to generate contractive plastic strains. Identification of the parameters based on triaxial tests is explained and illustrated by an example of calibration. A numerical analysis of a well-documented sheet pile wall in sand in Hochstetten (Germany) is presented. The results given by the model are compared with the measurements and with those obtained using the Hardening Soil Model. The potential advantages of the proposed model are then discussed.
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来源期刊
CiteScore
1.30
自引率
16.70%
发文量
20
审稿时长
16 weeks
期刊介绍: An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories
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