In order to study the stability of highway subgrade slope and the influencing factors under rainstorm conditions,taking Dong'e-Liaocheng Expressway project as the background,the influence of rainfall time,subgrade filling type,subgrade height and filling matching structure on the stability of subgrade slope was analyzed by numerical model.The results show that long-term rainfall leads to soil saturation and loss,which increases the risk of instability such as slope landslide.Different types of fillers have different effects on slope stability.Clay subgrade is relatively stable,and silt and mountain soil subgrade are less stable.The height of subgrade is in-versely related to the stability of slope,and the stability of higher subgrade slope is poor.In the subgrade filler collocation structure,the permeability coefficient of the filler gradually increases from top to bottom,which is negatively correlated with the safety factor of the slope,while in the filler collocation structure with gradually decreasing permeability coefficient,the safety factor of the slope is positive-ly correlated with the duration of rainfall.
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