Abstract

Frost heave action is a major issue in permafrost regions, leading to various geotechnical engineering problems. In this study, we assess the mechanical behavior of a concrete retaining wall subjected to frost heave under different ground conditions. The assessment utilizes ABAQUS integrated with several user subroutines. The numerical simulation model employs a thermo-mechanical coupled analysis with a porosity rate function, which enables to simulate time-dependent variations in porosity and frost heave of the backfill soil. After verification of the predictive reliability of the simulation model, the frost heave action in the soil and mechanical response of the retaining wall were evaluated regarding the initial groundwater level and presence of a drainage material on the backside of the retaining wall. According to the simulation results, as the initial groundwater level decreased in the backfill soil, the area susceptible to frost heave decreased. However, the von Mises stresses applied to the retaining wall increased. Under the same ground conditions, when the drainage material was installed on the backside of the retaining wall, the frost heave pressure acting on the wall significantly decreased, and less deformation and distortion of the retaining wall occurred.

中文翻译：

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冻土冻胀挡土墙结构力学行为评估

摘要

冻胀作用是永久冻土地区的一个主要问题，导致各种岩土工程问题。在这项研究中，我们评估了混凝土挡土墙在不同地面条件下遭受冻胀的力学行为。该评估利用与多个用户子程序集成的 ABAQUS。数值模拟模型采用具有孔隙率函数的热力耦合分析，能够模拟回填土的孔隙率和冻胀随时间的变化。在验证模拟模型的预测可靠性后，根据初始地下水位和挡土墙背面是否存在排水材料，评估了土壤中的冻胀作用和挡土墙的机械响应。根据模拟结果，随着回填土中初始地下水位的降低，易受冻胀影响的面积也随之减少。然而，施加到挡土墙上的冯米塞斯应力增加了。在相同地基条件下，当挡土墙背面安装排水材料时，作用于墙体上的冻胀压力显着降低，挡土墙的变形和扭曲也较小。