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大气降雨是触发边坡失稳的重要因素之一,合理排水可有效控制渗流、稳定边坡。针对福建典型的非饱和花岗岩残积土坡,基于饱和-非饱和渗流理论,分析研究降雨入渗条件及不同排水方式对渗流场控制规律及对边坡稳定性的影响规律。结果表明,降雨条件下存在临界降雨强度,在此强度内,边坡浅表处的最大孔隙水压力和地下水位均随降雨历时和降雨强度的增加而增加,坡脚渗流密集。水平排水管设置对边坡整体稳定性影响显著,最优排水管长度约为单级边坡的水平投影长度,排水管角度在工程中以10°为宜,坡顶坡底双层排水效果更佳。
Atmospheric rainfall is one of the important factors that trigger the instability of slope. Rational drainage can effectively control the seepage and stabilize the slope. Aiming at the unsaturated unsaturated granite slope in Fujian, based on the theory of saturated and unsaturated seepage, the influence of rainfall infiltration conditions and different drainage patterns on the control law of seepage field and the stability of slope are analyzed. The results show that there is a critical rainfall intensity under rainfall conditions. Within this intensity, the maximum pore water pressure and groundwater level at the shallow slope of slope increase with the increase of rainfall duration and rainfall intensity. The horizontal drainage pipe has a significant influence on the overall stability of the slope. The optimal drainage pipe length is about the horizontal projection length of single-stage slope. The drainage pipe angle is 10 ° in the project, good.