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为了探讨降雨入渗因素对炭质泥岩路堤边坡稳定性的影响,结合室内试验数据及降雨统计资料,通过拟定不同的分析方案,采用饱和-非饱和渗流与非饱和抗剪强度理论对某炭质泥岩路堤边坡在降雨强度、饱和渗透系数、路堤边坡坡度3种降雨入渗因素变化下的稳定性进行数值模拟,进而深入探讨上述3种入渗因素对炭质泥岩路堤边坡稳定性的影响。研究表明:(1)随着降雨持续时间的增加,降雨强度越大,路堤边坡安全系数下降越明显;(2)渗透系数的大小决定了降雨入渗量及渗透速率;(3)不同坡度路堤边坡受降雨的影响,其安全系数变化规律一致;(4)路堤内负孔隙水压力的丧失与体积含水率的增大是引起边坡失稳的最主要因素。
In order to investigate the influence of rainfall infiltration on the slope stability of carbonaceous mudstone embankment, a series of different analysis schemes were formulated based on the laboratory test data and rainfall statistics data, and a saturated-unsaturated seepage and unsaturated shear strength theory The stability of embankment slope of mudstone embankment under the change of rainfall intensity, saturation permeability coefficient and embankment slope gradient was numerically simulated. Then the influence of above three infiltration factors on the slope stability of embankment of carbonaceous mudstone Impact. The results show that: (1) With the increase of rainfall duration, the greater the rainfall intensity is, the more obvious the safety factor of embankment slope declines; (2) The infiltration coefficient determines the infiltration rate and infiltration rate; (3) The embankment slope affected by rainfall has the same change rule of safety factor. (4) The loss of negative pore water pressure and the increase of volumetric water content in embankment are the most important factors that cause slope instability.