Abstract

In order to study the impact of internal erosion at the scale of an engineering structure, a hydro-mechanical continuous modelling approach considering suffusion is needed. It requires a relevant mechanical model for granular soils considering the $f_c$-dependency ($f_c:$ fines content) and a hydraulic model for suffusion to control the changes in the fines content. To this purpose, the mechanical models for granular soil, the unified modelling approaches for $f_c$-dependency of granular soils and the hydraulic modelling of suffusion are first reviewed. Then, a hydro-mechanical model considering both suffusion and mechanical loading is developed by combining the three components. For each component of the model, alternative choices are provided. Simulations of laboratory tests as well as an example of a dike-on-foundation problem demonstrated the reliability and applicability of this coupled numerical approach for internal erosion problems.

摘要

为了研究工程结构尺度内侵蚀的影响，需要一种考虑扩散的流体力学连续建模方法。考虑到颗粒土壤需要一个相关的力学模型$F_C$-依赖（$F_C:$细粉含量）和用于控制细粉含量变化的扩散水力模型。为此，颗粒土的力学模型，统一的建模方法$F_C$-首先回顾了颗粒土壤的依赖性和扩散的水力模型。然后，通过结合这三个组成部分，开发了一个同时考虑扩散和机械载荷的流体力学模型。对于模型的每个组件，都提供了替代选择。实验室测试模拟以及基础堤防问题的示例证明了这种耦合数值方法对内部侵蚀问题的可靠性和适用性。