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以非饱和渗流理论为基础,建立有限元计算模型,对某公路路堑边坡在不同降雨强度分布状态下的边坡渗流特征进行了详细分析,得到边坡内部含水率变化规律以及边坡特征点处的孔隙水压力变化规律;以非饱和抗剪强度理论为基础,结合极限平衡法对边坡在不同渗流状态下的稳定性变化规律进行详细分析,具体研究结果表明:1边坡在前期强降雨条件下,内部含水率变化不大,地下水位上升较少,在中期强降雨条件下,内部含水率上升,地下水位线略有上升,在后期强降雨状态下,边坡内部含水率以及地下水位线明显上升;2边坡内部孔隙水压力会随着降雨强度的增加而显著增加,在后期强降雨工况下,边坡内部最终孔隙水压力大于前期强降雨以及中期强降雨工况;3前期强降雨使边坡安全系数下降较小,中期强降雨对边坡稳定性有一定影响,后期强降雨可导致边坡安全系数大幅下降。
Based on the theory of unsaturated seepage, a finite element model is established to analyze the slope seepage characteristics of a highway cutting slope under different rainfall intensity distributions. The variation law of internal water content and the characteristic points of slope Based on the theory of unsaturated shear strength and the limit equilibrium method, the stability of slope under different seepage conditions is analyzed in detail. The results show that: Under rainfall conditions, the internal water content did not change much and the groundwater level rose less. Under the medium-term heavy rainfall, the internal moisture content increased and the water table slightly increased. Under the condition of heavy rainfall in the later period, the internal moisture content of the slope and groundwater The pore water pressure increases obviously with the increase of rainfall intensity. In the later period of heavy rainfall, the final pore water pressure inside the slope is greater than that of the previous heavy rainfall and medium-term heavy rainfall. 3 Pre-heavy rains reduced the safety factor of the slope to a small extent, and heavy rains during the middle period had a certain impact on the stability of the slope. In the later period, heavy rainfall led to a large slope safety coefficient Decline.