降雨诱导的边坡渗流及边坡失稳机理研究
发布时间：2018-10-17 13:24
【摘要】：我国地形地质条件复杂,边坡失稳现象频频发生。而降雨,尤其是强度大、持续时间长的暴雨、特大暴雨是影响边坡稳定性的重要因素,据统计,高达90%以上滑坡都与降雨相关。所以,研究降雨作用下边坡的稳定性,对边坡失稳机理研究和边坡治理具有重要意义。 本文以贵州毕节至威宁高速公路K86+680-K86+980段高边坡研究项目为依托,通过建立非饱和土体模型,得出土体强度随含水量的增大而衰减的规律。利用ABAQUS建立有限元模型,分析了边坡内部渗流规律及边坡稳定性的影响因素,探求边坡的失稳机理。本文的主要成果如下： 1.建立土体的强度衰减模型,把土体强度参数粘聚力c和摩擦角(?)分别看作由两部分组成,一部分与含水量无关,另一部分与含水量相关。并与传统非饱和土强度理论进行对比,证明其正确性。 2.分析了降雨过程中,边坡内部渗流规律,并进一步研究了降雨强度和降雨历时对边坡渗流的影响。结果表明：特定降雨历时条件下,孔隙水压力随降雨强度的增大而非线性增大,渗流速度随降雨强度增大而接近线性增大；特定降雨强度条件下,孔隙水压力和渗流速度,随着降雨历时的增加都接近线性增大。 3.分别从边坡岩性角度、力学角度及降雨的角度,对边坡失稳机理进行分析。 4.分别研究了粘聚力c和摩擦角(?),变形模量E和泊松比u,降雨强度,降雨持续时间,边坡渗流系数等对边坡的稳定性影响,确定影响边坡稳定性的主要因素。
[Abstract]:The topographic and geological conditions in China are complex, and slope instability occurs frequently. The rainfall, especially the rainstorm with high intensity and long duration, is an important factor affecting slope stability. According to statistics, more than 90% landslides are related to rainfall. Therefore, the study of slope stability under rainfall is of great significance to the study of slope instability mechanism and slope control. Based on the research project of high slope in K86 680-K86 980 section of Bijie to Weining Expressway in Guizhou Province, the law of soil strength attenuation with the increase of water content is obtained by establishing unsaturated soil mass model. The finite element model is established by using ABAQUS to analyze the internal seepage law of slope and the influencing factors of slope stability, and to find out the mechanism of slope instability. The main results of this paper are as follows: 1. The strength attenuation model of soil is established, and the cohesive force c and friction angle of soil strength parameter c and friction angle (?) They are divided into two parts, one is independent of water content and the other is water content. Compared with the traditional unsaturated soil strength theory, it is proved to be correct. 2. In this paper, the internal seepage law of slope is analyzed, and the influence of rainfall intensity and rainfall duration on slope seepage is further studied. The results show that the pore water pressure increases linearly with the increase of rainfall intensity, and the percolation velocity increases linearly with the increase of rainfall intensity, while the pore water pressure and percolation velocity increase linearly with the increase of rainfall intensity. With the increase of rainfall duration, all of them are close to linear increase. 3. From the angle of slope lithology, mechanics and rainfall, the mechanism of slope instability is analyzed. 4. The effects of cohesion C and friction angle (?), deformation modulus E and Poisson's ratio u, rainfall intensity, rainfall duration, slope seepage coefficient on slope stability were studied, and the main factors affecting slope stability were determined.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14
本文编号：2276794
[Abstract]:The topographic and geological conditions in China are complex, and slope instability occurs frequently. The rainfall, especially the rainstorm with high intensity and long duration, is an important factor affecting slope stability. According to statistics, more than 90% landslides are related to rainfall. Therefore, the study of slope stability under rainfall is of great significance to the study of slope instability mechanism and slope control. Based on the research project of high slope in K86 680-K86 980 section of Bijie to Weining Expressway in Guizhou Province, the law of soil strength attenuation with the increase of water content is obtained by establishing unsaturated soil mass model. The finite element model is established by using ABAQUS to analyze the internal seepage law of slope and the influencing factors of slope stability, and to find out the mechanism of slope instability. The main results of this paper are as follows: 1. The strength attenuation model of soil is established, and the cohesive force c and friction angle of soil strength parameter c and friction angle (?) They are divided into two parts, one is independent of water content and the other is water content. Compared with the traditional unsaturated soil strength theory, it is proved to be correct. 2. In this paper, the internal seepage law of slope is analyzed, and the influence of rainfall intensity and rainfall duration on slope seepage is further studied. The results show that the pore water pressure increases linearly with the increase of rainfall intensity, and the percolation velocity increases linearly with the increase of rainfall intensity, while the pore water pressure and percolation velocity increase linearly with the increase of rainfall intensity. With the increase of rainfall duration, all of them are close to linear increase. 3. From the angle of slope lithology, mechanics and rainfall, the mechanism of slope instability is analyzed. 4. The effects of cohesion C and friction angle (?), deformation modulus E and Poisson's ratio u, rainfall intensity, rainfall duration, slope seepage coefficient on slope stability were studied, and the main factors affecting slope stability were determined.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14
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