强降雨作用下昔格达边坡渗流特性及稳定性分析
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中国科学院,水利部成都山地灾害与环境研究所

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Analysis of seepage characteristics and stability of Xigeda Formation slope under heavy rainfall
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Institute of Mountain Hazards and Environment,CAS

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National Natural Science Foundation of China

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    摘要:

    昔格达地层分布于我国西南,其工程性质极差。为分析上覆第四纪残坡积物的昔格达组粉砂土边坡在强降雨作用下渗流特性及稳定性,本文结合石棉县莫家岗滑坡,以数值模拟手段研究坡体渗流规律;以Morgenstern-Price方法计算各时刻坡体稳定性系数并分析其变化规律。结果表明:雨水在坡体中逐层入渗,雨停后渗流过程将继续发展,由于存在土层分界面,坡体渗流特性不同于均质坡体;降雨过程中孔隙水压力发生增长的范围在界面附近加速拓展,雨停后土层分界面附近第四纪残坡积物仍处于近饱和状态;降雨入渗导致坡体边坡稳定性系数下降,且稳定性系数变化对降雨的响应存在滞后。本文的研究可为昔格达地层滑坡的防治提供参考。

    Abstract:

    Xigeda Formation is distributed in southwest of China, and its engineering properties are very poor. In order to analyze seepage characteristics and stability of silty sand slope of Xigeda Formation overlying Quaternary residual slope sediments under heavy rainfall conditions, Based on Mojiagang landslide in Shimian County, seepage law of slope is studied by numerical simulation; Morgenstern-Price method is used to calculate safety factor of landslide and to analyze their variation laws. The results show that: rainwater infiltrates into slope layer by layer, and seepage process will continue after rainfall. As the existence of soil layer interface, seepage characteristics are different from homogeneous slope; during the rainfall process, the range of pore water pressure growth accelerates near the interface, and the Quaternary residual slope sediments near the interface is still in a near-saturated state after the rainfall; rainfall infiltration leads to reduce safety factor of the slope, and stability has a lag in response to rainfall. This study can provide reference for prevention of Xigeda Formation landslide.

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历史
  • 收稿日期:2019-11-27
  • 最后修改日期:2020-01-15
  • 录用日期:2020-02-18
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