尚敏, 刘昱廷, Dave Chan, 等. 2021. 基于孔隙水压力变化的三峡库区盐关滑坡破坏机制分析[J]. 工程地质学报, 29(3): 734-741. doi: 10.13544/j.cnki.jeg.2020-040.
    引用本文: 尚敏, 刘昱廷, Dave Chan, 等. 2021. 基于孔隙水压力变化的三峡库区盐关滑坡破坏机制分析[J]. 工程地质学报, 29(3): 734-741. doi: 10.13544/j.cnki.jeg.2020-040.
    Shang Min, Liu Yuting, Dave Chan, et al. 2021. Analysis of failure mechanism of Yanguan landslide in Three Gorges Reservoir area based on the change of pore pressure[J]. Journal of Engineering Geology, 29(3): 734-741. doi: 10.13544/j.cnki.jeg.2020-040.
    Citation: Shang Min, Liu Yuting, Dave Chan, et al. 2021. Analysis of failure mechanism of Yanguan landslide in Three Gorges Reservoir area based on the change of pore pressure[J]. Journal of Engineering Geology, 29(3): 734-741. doi: 10.13544/j.cnki.jeg.2020-040.

    基于孔隙水压力变化的三峡库区盐关滑坡破坏机制分析

    ANALYSIS OF FAILURE MECHANISM OF YANGUAN LANDSLIDE IN THREE GORGES RESERVOIR AREA BASED ON THE CHANGE OF PORE PRESSURE

    • 摘要: 2017年10月30日,位于秭归县归州镇香溪河右岸的盐关滑坡发生整体滑移破坏,成为近年来三峡库区为数不多的整体破坏变形的滑坡之一。根据现场应急调查,滑坡在不到3天的时间内经历了预警直至完全破坏的过程。本文以盐关滑坡为实例,根据滑坡失稳破坏特征结合有效应力原理提出了孔隙水压力变化速率条件下滑坡失稳破坏的模式,分析出滑坡体内的孔隙水压力对滑坡破坏的影响,最后通过有限元模拟软件予以验证。利用Geo-Studio岩土仿真软件SEEP/W模块模拟盐关滑坡在降雨入渗作用下的渗流场,结合滑坡变形期直至破坏时的实际库水位值计算出孔隙水压力随时间变化曲线,并且将所得结果应用到Slope/W模块,计算出滑坡的安全系数随时间的变化曲线,从而验证出滑坡失稳破坏的主要原因是滑坡内部土体在降雨和库水位的作用下达到饱和后,孔隙水压力激增所导致的。

       

      Abstract: Yanguan landslide was on the right bank of Xiangxi River in Guizhou Town,Zigui County and suffered from overall damage on October 30,2017. It became one of few failed landslides in the Three Gorges reservoir area in recent years. According to the site emergency investigation,the landslide went through the process of early warning to complete destruction in less than three days. In this paper,we use module SEEP/W in the finite element geotechnical simulation software Geo-Studio to simulate the seepage field of Yanguan landslide under the boundary conditions of actual rainfall infiltration and reservoir water level value. Next,we calculate the change of pore water pressure value with time. Then,we apply the results to another module Slope/W to calculate the curve of safe of factor. We propose the mode of landslide instability and failure under the condition of pore water pressure change rate combining with the principle of effective stress and take Yanguan landslide as an example to analyze the influence of pore pressure on landslide failure. Then,we verify the cause of failure that the pore water pressure soars after the soil inside the landslide is saturated under the action of combined effect,rainfall and high reservoir water level.

       

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