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Prediction of lateral swelling pressure behind retaining structure with expansive soil as backfill

机译：以膨胀土为回填的挡土墙后侧向膨胀压力的预测

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Lateral swelling pressure (LSP) develops in expansive soil when the volume expansion associated with water infiltration is restrained in the horizontal direction due to a rigid infrastructure. Various types of testing techniques, used to determine the LSP from both laboratory and field studies, are critically reviewed by focusing on two key factors, namely, the boundary conditions and the saturation path. Most testing techniques are capable of reasonably simulating the stress state of a soil element behind a retaining structure by applying a fixed boundary condition in the horizontal direction and a stress boundary condition in the vertical direction. However, they are only used to determine the LSP following a simple path, which is from an initially unsaturated state to a fully saturated state. In other words, these tests fail to provide information on the variation in LSP with respect to changes in the degree of saturation, the water content or the matric suction during the infiltration process. Furthermore, the literature review suggests that a reliable model for the prediction of the LSP during the infiltration process is not available. For this reason, a model is proposed in this paper to estimate the lateral earth pressure (LEP) considering the variation in LSP behind fixed rigid retaining structures with respect to the matric suction during the infiltration process. The proposed model is simple and only requires information, which includes the soil water characteristic curve (SWCC) and a limited number of soil properties. Data from one large-scale model test and two field case studies from published literature are used to illustrate and verify the proposed model. Reasonable comparisons are made between the predictions and the measured data. The proposed model will be a valuable tool for use in conventional engineering practice for the quick prediction of the increasing LEP behind retaining structures with expansive soils as backfill due to the development of LSP associated with water infiltration. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：当由于刚性基础设施而在水平方向上抑制与水渗透有关的体积膨胀时，膨胀土壤中会产生横向膨胀压力（LSP）。通过关注两个关键因素，即边界条件和饱和路径，对用于从实验室和现场研究中确定LSP的各种类型的测试技术进行了严格审查。大多数测试技术能够通过在水平方向上施加固定边界条件和在垂直方向上施加应力边界条件来合理地模拟挡土结构后面的土壤单元的应力状态。但是，它们仅用于确定遵循从原始不饱和状态到完全饱和状态的简单路径的LSP。换句话说，这些测试无法提供有关渗透过程中饱和度，含水量或基质吸力变化方面LSP变化的信息。此外，文献综述表明，在渗透过程中没有可靠的LSP预测模型。因此，本文提出了一个模型，该模型考虑了渗透过程中固定刚性固定结构后面的LSP相对于基质吸力的LSP的变化来估算侧向土压力（LEP）。提出的模型很简单，只需要信息，其中包括土壤水分特征曲线（SWCC）和有限数量的土壤特性。来自一项大规模模型测试的数据和来自已发表文献的两次现场案例研究的数据用于说明和验证所提出的模型。在预测和测得的数据之间进行合理的比较。所提出的模型将是用于常规工程实践中的有价值的工具，用于快速预测由于与水渗透有关的LSP的发展，带有膨胀土壤作为回填的保持结构后面的LEP增加。 （C）2018年由Elsevier B.V.代表日本岩土工程学会制作和托管。

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