考虑土水相互作用的流滑三维运动过程数值模拟研究

项目名称： 考虑土水相互作用的流滑三维运动过程数值模拟研究

项目编号： No.51309259

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 李维朝

作者单位： 中国水利水电科学研究院

项目金额： 25万元

中文摘要： 流滑是滑体呈流态运动的一类滑坡灾害，具有突发性强、高速、远距等特点，一旦发生往往造成灾难性的后果。流滑过程中土水共存，且两者相互作用会导致孔隙水压力时空变化，从而影响运动过程。然而当前流滑运动过程的数值模拟均假设滑体为单相物质，没有考虑运动过程中的土水相互作用及其对运动的影响，导致模拟结果，特别是弯道超高堆积和沉积模式，与实际有较大的偏差。本项目拟通过材料试验、模型试验和流滑实例校正，将固液耦合理论融入离散元模拟中，获取微观固液耦合参数与宏观参数的关系，探讨反应流滑初始状态的离散元建模方法，研究流滑运动过程中动态边界的边界条件设定方法，最终建立可以考虑土水相互作用的流滑三维运动过程数值模拟技术。通过本项目的研究，有望阐释流滑体高速运移与沉积形态的形成机理，进一步提升流滑风险的数值预测方法。

中文关键词： 流滑；颗粒流；降雨滑坡；水文响应；

英文摘要： Flowslide is regarded as one of the most insidious form of landslide for its lack of pre-failure indication. In general, flowslide is characterized by rapid movement, fluid-like motion, and long run-out distance. Soil-water interaction plays a key role in run-out behavior of flowslide, it can influence the complex time and space dependent changing of pore water pressure, hence influence the run-out behavior. Present numerical studies take flowslide mass as one phase material without considering soil-water interaction. So the results, especially lateral depositing and depositing modes, can't truly represent the run-out behavior. The aim of this project is to conduct numerical study on 3D run-out behavior of flowslide considering soil-water interaction, through calibration of material test, experiment and case study, based on discrete element method coupling with fluid. Through this research, correlation between micro and macro parameters can be drawn, numerical model can be built to present the initial conditions of flowslide, and boundary conditions of changing boundaries can be assigned. This research can help to understand the mechanism of high-speed movement and depositing modes, it can also promote the level of numerical assessment of flowslide hazard.

英文关键词： flowslide；PFC；rainfall induced landslide；hydraulic response；