考虑滑面热-水-力耦合响应的大型降雨滑坡运动特性研究

In recent years, with global warming, the extremely heavy rainfall increasing, and thus sharply increase the scale and frequency of rainfall-induced landslide. The rainfall-induced large-scale landslide hazard is often occurrence and resulted in enormous casualty and property loss. The rainfall-induced large-scale landslide hazard prevention and mitigation we are facing become extremely serious. Therefore, the project chooses a typical rainfall-induced large-scale landslide as the study subject. It focused on the thermo-poro-mechanical coupling effect at shear zone, to building the physical model for rainfall-induced large-scale landslide motion considering the thermo-poro-mechanical coupling effect at shear zone. The efficient numerical algorithm is developing to adapt the complex topographty. The numerical simulation platform for rainfall-induced large-scale landslide sliding evolution is constructed. Rainfall-induced large-scale landslide sliding evaluation process can be reappeared by the real-time simulation. The internal mechanism of rainfall-induced large-scale landslide sliding evolution is revealed, which will be the theory basis to rainfall-induced large-scale landslide prediction, assessment, prevention and mitigation, and also be the technical supports for the major projects site selection and urban construction in western mountain area of China.

近年来随着全球气候变暖，极端强降雨天气增加，降雨滑坡灾害的发生规模和频率显著增加，大型降雨滑坡灾害事件频现，造成巨大的人员伤亡和财产损失。我国面临的大型降雨滑坡灾害防灾减灾形势异常严峻。因此，本项目以典型大型降雨滑坡为研究对象，以滑面剪切带内的热-水-力耦合响应为重点，构建考虑滑面热-水-力耦合响应的大型降雨滑坡运动物理模型；发展能适应复杂地形地貌条件的高效数值算法，建立大型降雨滑坡运动演化的数值计算平台，实现对大型降雨滑坡运动演化过程的实时模拟，揭示大型降雨滑坡超强运动特性的内在机理，为大型降雨滑坡的预测、评估以及防灾减灾提供理论基础，更是为我国为西部山区重大工程选址和城镇建设提供技术支撑。

在全球气候变暖，极端强降雨天气增加的背景下,大型降雨滑坡灾害事件频现，造成巨大的人员伤亡和财产损失。我国面临的大型降雨滑坡灾害防灾减灾形势异常严峻。因此，本项目以典型大型降雨滑坡为研究对象，提出了从滑面剪切带内热-水-力耦合响应的角度出发，展开其高速远程、流态化运动特性的研究。采用理论分析、数值模拟等方法辅以野外调查、室内实验等研究手段，利用热传导方程、孔隙水压力扩散方程和有效应力原理，建立了大型降雨滑坡滑面热-水-力耦合响应关系模型；进而结合深度平均理论Savage-Hutter模型，考虑运动过程中的质量守恒、动量守恒以及能量守恒，构建了考虑滑面热-水-力耦合响应的大型降雨滑坡运动物理模型；采用有限差分方法和有限体积法，发展了高效的数值算法，基于Matlab软件和GIS技术平台，构建了真实地形地貌情况下的考虑滑面热-水-力耦合响应的大型降雨滑坡动力演化过程计算平台；展开了对三溪村滑坡的动力过程的模拟再现，并反演了其运动过程中的流态、滑面孔隙水压力以及温度场的时空演化规律，阐释了大型降雨滑坡运动特性的内在机理。本项目的研究为大型降雨滑坡的预测、评估以及防灾减灾提供理论基础，更是为我国为西部山区重大工程选址和城镇建设提供技术支撑。