降雨条件下裂隙开度对含裂隙泥岩库岸边坡稳定性影响

蒋煌斌; 王祥; 梁经纬

doi:10.13928/j.cnki.wrahe.2025.S1.097

水利水电技术（中英文） ›› 2025, Vol. 56 ›› Issue (S1) : 642 -646. DOI: 10.13928/j.cnki.wrahe.2025.S1.097

工程地质

降雨条件下裂隙开度对含裂隙泥岩库岸边坡稳定性影响

蒋煌斌 ¹^,² ,
王祥 ¹^,² ,
梁经纬 ¹^,²

作者信息 +

Research on the impact of fracture aperture on the stability of mudstone reservoir bank slopes under rainfall conditions

Huangbin JIANG ¹^,² ,
Xiang WANG ¹^,² ,
Jingwei LIANG ¹^,²

Author information +

文章历史 +

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摘要

降雨条件下边坡裂隙渗流与稳定性研究一直是边坡灾害防控的关键环节。为探究裂隙开度对泥岩库岸边坡稳定性影响，采用有限元数值模拟技术，研究降雨条件下含不同裂隙开度的边坡内部渗流特征变化规律，分析不同边坡破坏模式下裂隙开度对其稳定性影响规律。结果表明：降雨条件下，雨水沿边坡岩体裂隙渗入内部，并在坡脚处形成饱和区域，且该区域面积随裂隙开度的增大而增大。泥岩库岸边坡发生滑移破坏时，稳定系数随裂隙开度和增大而增大，当裂隙开度大于0.75 mm,边坡安全系数达到1.2;发生层滑移-弯曲破坏时，稳定系数随裂隙开度的增大而减小，裂隙开度小于0.15 mm时，边坡系数达到1.4。可见，裂隙开度对泥岩库岸边坡稳定性的影响与边坡的破坏模式有直接关系。

Abstract

The study of slope stability problems under the influence of rainfall is a key link in the prevention and control of slope disasters. To explore the impact of fracture aperture on the stability of mudstone reservoir bank slopes, the finite element numerical simulation technique was used to investigate the changes in internal seepage characteristics of slopes with different fracture apertures under rainfall conditions, and to analyze the rules of the impact of crack aperture on their stability under different slope failure modes. The results show that under rainfall conditions, rainwater permeates into the interior along the fracture of the slope rock mass and forms a saturated area at the base of the slope, with the area of this region increasing as the fracture aperture increases. When the mudstone reservoir bank slope undergoes slip failure, the stability coefficient increases with the increase of the fracture aperture, and when the fracture aperture is greater than 0.75 mm, the safety factor of the slope reaches 1.2; when it undergoes layer slip-bending failure, the stability coefficient decreases with the increase of the fracture aperture, and when the fracture aperture is less than 0.15 mm, the safety factor of the slope reaches 1.4. It can be seen that the impact of fracture aperture on the stability of mudstone reservoir bank slopes is directly related to the failure mode of the slope.