降雨条件下水敏性高填方路基边坡稳定性分析

Slope stability of water sensitive high fill subgrade under rainfall

地表附近的填方路基边坡多为非饱和土,在降雨条件下,边坡土体的渗透性和力学特性都会受到不同程度的影响,特别当填方路基土料的水敏性较高,且路基高度较高时,路基边坡的稳定性将受到降雨因素的较大影响。为进行降雨条件下水敏性高填方路基边坡的稳定性分析,采用有限元软件建立高边坡路基模型,在降雨条件下进行数值模拟分析,探究路基代表剖面处的体积含水率和孔隙水压力变化规律,评价路基边坡的稳定性,分析成果可供类似工程参考。

The fill subgrade slope near the surface is mostly unsaturated soil.Under the condition of rainfall,the permeability and mechanical properties of slope soil will be affected to varying degrees.In particular,when the soil material of the filling subgrade has high water sensitivity and high subgrade height,the stability of the subgrade slope will be greatly affected by rainfall factors.In order to analyze the stability of water sensitive high fill subgrade slope under rainfall conditions,this paper uses the finite element software to establish the high slope subgrade model,carries out numerical simulation analysis under rainfall conditions,explores the variation law of volume moisture content and pore water pressure at the representative section of subgrade,and evaluates the stability of subgrade slope.The results can provide reference for engineering construction.