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-  2019 

下咱日堆积体非饱和渗流与稳定性评价 Unsaturated seepage and stability analysis of Xiazanri accumulative body

Keywords: 堆积体,非饱和渗流,位移,稳定性,暴雨

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Abstract:

暴雨作用下边坡的稳定性问题一直是工程上非常关心的复杂系统问题.通过非饱和渗流理论和改进的Bishop法,考虑非饱和带基质吸力和暂态附加水荷载等作用,利用Geo-Slope公司系列软件进行耦合分析,对梨园水电站下咱日堆积体进行稳定性评价.结果表明:降雨开始时,地表点基质吸力迅速降低,基质吸力降低的起始时间明显滞后于降雨的起始时间;暴雨强度越大,相同降雨历时各关键点处位移量越大,直至堆积体内超孔隙水压力完全消散,各关键点位移才基本趋于稳定;随着降雨持续,堆积体安全系数不断降低,雨后2~3d安全系数才达到最小值,之后由于坡体内基质吸力回升、抗剪强度增加,从而堆积体安全系数又有所增大

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