本课题以粘性土的接触冲刷破坏问题为对象开展研究工作，拟采用自行研制改进的土工接触面剪切-渗流冲刷联合试验仪进行粘性土的接触冲刷特性试验研究；揭示剪切-渗流耦合作用条件下粘性土接触冲刷的发生机制及发展直至破坏的规律；基于理论分析，建立土体接触面的抗冲刷数学模型，分析土体微团冲刷的初始起动条件，提出土体接触面的抗渗稳定安全评价方法；将数学模型嵌入土体流固耦合数值计算软件，用以模拟土体接触冲刷发生、发展直至破坏的过程。本项目的创新点包括：研究粘性土接触面发生剪切变形后的抗冲刷特性；揭示剪切-渗流耦合作用条件下土体接触冲刷破坏的发生机制；建立土体接触面抗冲刷数学模型，提出相应的安全评价方法，并模拟土体接触冲刷破坏过程。该项目的研究成果对于揭示岩土工程中广泛存在的土体接触冲刷破坏问题的发生机制以及合理评价其抗渗安全性具有指导作用，本研究既具有理论意义又具有重要的实用价值。

Interface scouring problem is the topic of this research. There are three main research aspects. Firstly, testing researches of interface scouring characteristics of clayey soil are carried out based on developed shear-seepage contacted testing device. Mechanisms of interface scouring and overall processes from beginning to break are revealed. And then a mathematic model for interface scouring is established by theoretical analysis. Initial moving of soil micelle is analyzed and a method for safety assessment of scouring stability is proposed. By implanting the mathematic model into numerical calculation software for fluid-structure interaction, the overall processes of interface scouring will be simulated. The innovation points of this topic are interface scouring tests and characteristics studies, occurrence mechanisms and processes analysis, mathematic model and a safety assessment method, numerical simulations and so on. The research results can be guidance to revealing mechanisms of interface scouring and evaluating seepage safety of geotechnical structures, which has theoretical significance and important practical values.