史振宁, 戚双星, 刘登生. 2022. 考虑初始含水率分布的覆盖层边坡非饱和入渗过程与稳定性计算方法[J]. 工程地质学报, 30(4): 999-1009. doi: 10.13544/j.cnki.jeg.2020-009.
    引用本文: 史振宁, 戚双星, 刘登生. 2022. 考虑初始含水率分布的覆盖层边坡非饱和入渗过程与稳定性计算方法[J]. 工程地质学报, 30(4): 999-1009. doi: 10.13544/j.cnki.jeg.2020-009.
    Shi Zhenning, Qi Shuangxing, Liu Dengsheng. 2022. Unsaturated infiltration process and stability calculation method of overburden slope considering initial water content distribution[J]. Journal of Engineering Geology, 30(4): 999-1009. doi: 10.13544/j.cnki.jeg.2020-009.
    Citation: Shi Zhenning, Qi Shuangxing, Liu Dengsheng. 2022. Unsaturated infiltration process and stability calculation method of overburden slope considering initial water content distribution[J]. Journal of Engineering Geology, 30(4): 999-1009. doi: 10.13544/j.cnki.jeg.2020-009.

    考虑初始含水率分布的覆盖层边坡非饱和入渗过程与稳定性计算方法

    UNSATURATED INFILTRATION PROCESS AND STABILITY CALCULATION METHOD OF OVERBURDEN SLOPE CONSIDERING INITIAL WATER CONTENT DISTRIBUTION

    • 摘要: 根据覆盖层边坡特性设计室内降雨试验模型,提出初始含水率分布沿高程呈反比例分布。根据边坡表面未饱和时降雨入渗受总降雨量控制的基本假设,建立了不排水状态下覆盖层边坡降雨入渗的解析计算方法。基于上述降雨入渗理论,考虑非饱和土抗剪强度变化规律,建立适用于非饱和覆盖层边坡的边坡稳定性计算方法。分析了覆盖层厚度、初始含水率分布参数以及覆盖层边坡角度对边坡稳定性的影响规律。具体结论如下:(1)覆盖层边坡内部初始含水率分布可采用反比例分布近似表示,基于总降雨量控制假设,得到可考虑初始含水率分布的覆盖层边坡降雨入渗解析计算方法。(2)基于半无限空间体边坡假设,给出覆盖层边坡在降雨入渗条件下不同位置滑动面的稳定系数计算方法。(3)在相同降雨量条件下,边坡初始稳定性随覆盖层土体厚度的增加而下降。降雨入渗对覆盖层边坡稳定性的影响随着上覆土层厚度的增加而减小。(4)当降雨量相同时边坡稳定性随着覆盖层土体初始含水率分布参数的增加而下降,降雨时间越长,初始含水率分布对边坡稳定的影响越明显。(5)不同角度的覆盖层边坡稳定性均随降雨量增加而逐渐减小。在初始状态下边坡角度增加所引起的最小稳定系数下降幅度最大,随着降雨量的增加,边坡稳定性受角度影响逐渐减小。

       

      Abstract: A laboratory rainfall test model is designed according to the characteristics of the overburden slope. The test results shows that the initial water content distribution is inversely proportional along the elevation. It is futher assumed that rainfall infiltration is controlled by the total rainfall when the slope surface is unsaturated. An analytical calculation method for rainfall infiltration in the overburden slope under undrained condition is then established. A slope stability calculation method for unsaturated overburden slope is also established considering the rainfall infiltration theory and the shear strength variation of unsaturated soils. The influence of overburden thickness,initial water content distribution parameters and slope angle on slope stability are analyzed. Research results are as follows:(1)The initial water content distribution in the overburden slope is approximated with an inverse proportional distribution. Based on the total rainfall control assumption,an analytical calculation method is obtained for the rainfall infiltration of the overburden slope considering the initial water content distribution. (2)With the assumption of a semi-infinite space volume,a method is given for calculating the factor of safety of the sliding surface at different positions of the overburden slope under rainfall infiltration. (3)The initial stability of the slope decreases with the increase of the thickness of the overburden soil under the same rainfall conditions. The influence of rainfall infiltration on the stability of overburden slope decreases with the increase of overburden thickness. (4)The stability of the slope decreases with the increase of the initial water content distribution parameter of the overburden soil when the rainfall is the same. The longer the rainfall time,the more obvious the influence of initial water content distribution on slope stability. (5)The stability of the overburden slope at different angles gradually decreases with the increase of rainfall. In the initial state,the minimum stability coefficient caused by the increase of the slope angle decreases the most. As the rainfall increases,the slope stability is gradually reduced by the angle.

       

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