降雨作用下川东红层地区浅层土质滑坡稳定性数值分析
发布时间：2018-09-12 07:20
【摘要】：基于非饱和土渗流理论,利用COMSOL Multiphysics软件,对川东红层地区南江县某基岩面上的浅层滑坡建立均匀长坡的降雨入渗模型,考虑坡脚边界的不同透水效果,计算得到降雨作用下基岩面上地下水的变化。结合极限平衡法,分析上覆土质滑坡在低强度和高强度降雨下滑坡稳定性系数随时间的变化,以及不同初始压力水头对稳定性系数的影响。研究结果表明,坡脚处边界的透水效果对滑坡土体内积水变化影响是明显的;高强度降雨使稳定性系数开始下降时刻更早,下降速率更快,下降速率随时间的变化表现为先慢后快;初始压力水头绝对值越小,稳定性系数开始下降得越早。
[Abstract]:Based on the unsaturated soil seepage theory and COMSOL Multiphysics software, the rainfall infiltration model of a shallow landslide on a bedrock surface in Nanjiang County, East Sichuan Red bed area, is established, considering the different permeable effects of the boundary of the slope foot. The variation of groundwater on the bedrock surface under rainfall is calculated. Combined with the limit equilibrium method, the variation of landslide stability coefficient with time under low and high intensity rainfall and the influence of water head of different initial pressure on the stability coefficient of overlying soil landslide are analyzed. The results show that the permeable effect of the boundary at the foot of the slope has an obvious effect on the variation of hydrops in the landslide soil, and the high intensity rainfall makes the stability coefficient begin to decline earlier and the decline rate is faster. The decrease rate changes with time first slowly then quickly; the smaller the absolute value of the initial pressure head, the earlier the stability coefficient begins to decline.
【作者单位】： 成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家基础研究计划(“973”计划)项目(2013CB-733202) 国家自然科学基金面上项目(41672282) 四川省青年科技创新研究团队(2015TD0030)
【分类号】：P642.22
本文编号：2238302
[Abstract]:Based on the unsaturated soil seepage theory and COMSOL Multiphysics software, the rainfall infiltration model of a shallow landslide on a bedrock surface in Nanjiang County, East Sichuan Red bed area, is established, considering the different permeable effects of the boundary of the slope foot. The variation of groundwater on the bedrock surface under rainfall is calculated. Combined with the limit equilibrium method, the variation of landslide stability coefficient with time under low and high intensity rainfall and the influence of water head of different initial pressure on the stability coefficient of overlying soil landslide are analyzed. The results show that the permeable effect of the boundary at the foot of the slope has an obvious effect on the variation of hydrops in the landslide soil, and the high intensity rainfall makes the stability coefficient begin to decline earlier and the decline rate is faster. The decrease rate changes with time first slowly then quickly; the smaller the absolute value of the initial pressure head, the earlier the stability coefficient begins to decline.
【作者单位】： 成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家基础研究计划(“973”计划)项目(2013CB-733202) 国家自然科学基金面上项目(41672282) 四川省青年科技创新研究团队(2015TD0030)
【分类号】：P642.22
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