考虑基质吸力的降雨型滑坡物理力学机制分析
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摘要
我国是地质灾害多发国家,据统计90%以上为滑坡灾害。降雨是诱发滑坡的重要因素,但以往研究降雨型滑坡是基于饱和土的物理力学性质,未考虑过非饱和土体中的基质吸力,但自然界中边坡多为非饱和土边坡,因此研究考虑基质吸力的降雨型滑坡的作用机理具有重要的现实意义。现通过非饱和土抗剪强度理论,分析总结得到以下结论:(1)宏观分析考虑基质吸力的降雨滑坡力学作用机制;(2)微观分析单位体积含水率对岩土体基质吸力的影响;(3)降雨对滑坡的物理作用机制。其内容可供同行参考。
China is a country prone to geological disasters. More than 90% of disasters are the landslide disasters according to statistics. Rainfall is an important factor to induce the landslides. However, the previous studies on rainfall-type landslides are the physical and mechanical properties based on the saturated soil without considering the matric suction in unsaturated soil. But the most of slopes in nature are theunsaturated soil slopes. Therefore, it is of great practical significance to study the action mechanism of rainfall-type landslides considering matric suction. According to the theory of shear strength of unsaturated soil, the following conclusions are drawn from the analysis:(1) macroscopic analysis of the mechanism of mechanical action of rainfall landslide considering the matrix suction,(2) microscopic analysis of the influence of water content per unit volume on the matrix suction of rock and soil, and(3) physical action mechanism of rainfall on landslide. The contents can be referred for the similar projects.
China is a country prone to geological disasters. More than 90% of disasters are the landslide disasters according to statistics. Rainfall is an important factor to induce the landslides. However, the previous studies on rainfall-type landslides are the physical and mechanical properties based on the saturated soil without considering the matric suction in unsaturated soil. But the most of slopes in nature are theunsaturated soil slopes. Therefore, it is of great practical significance to study the action mechanism of rainfall-type landslides considering matric suction. According to the theory of shear strength of unsaturated soil, the following conclusions are drawn from the analysis:(1) macroscopic analysis of the mechanism of mechanical action of rainfall landslide considering the matrix suction,(2) microscopic analysis of the influence of water content per unit volume on the matrix suction of rock and soil, and(3) physical action mechanism of rainfall on landslide. The contents can be referred for the similar projects.
引文
[1]陈正洪，孟斌.湖北省降雨型滑坡泥石流及其降雨因子的时空分布、相关性浅析[J].岩土力学，1995(3).
[2]李晓.重庆地区的强降雨过程与地质灾害的相关分析[J].中国地质灾害与防治学报，1995(3).
[3]张珍，李世海，马力.重庆地区滑坡与降雨的概率分析[J].岩石力学与工程学报，2005,24(17):3185-3191.
[2]李晓.重庆地区的强降雨过程与地质灾害的相关分析[J].中国地质灾害与防治学报，1995(3).
[3]张珍，李世海，马力.重庆地区滑坡与降雨的概率分析[J].岩石力学与工程学报，2005,24(17):3185-3191.