The commonly used Mohr-Coulomb (M-C) failure condition has a limitation that it overestimates the tensile strength of cohesive soils. To overcome this limitation, the tensile strength cut-off was applied where the predicted tensile strength is reduced or eliminated. This work then presented a kinematical approach to evaluate the active earth pressure on subgrade retaining walls in cohesive backfills with saturated seepage effects. An effective rotational failure mechanism was constructed assuming an associative flow rule. The impact of seepage forces, whose distribution is described by a closed-form solution, was incorporated into the analysis. The thrust of active earth pressure was derived from the energy conservation equation, and an optimization program was then coded to obtain the most critical solution. Several sets of charts were produced to perform a parameter analysis. The results show that taking soil cohesion into account has a distinct beneficial influence on the stability of retaining walls, while seepage forces have an adverse effect. The active earth pressure increases when tensile strength cut-off is considered, and this increment is more noticeable under larger cohesion.

常用的Mohr-Coulomb（MC）破坏条件有一个局限性，即它高估了粘性土壤的抗张强度。为了克服此限制，在降低或消除了预期拉伸强度的情况下应用了拉伸强度截止值。然后，这项工作提出了一种运动学方法，以评估具有饱和渗流作用的粘性回填土中路基挡土墙的主动土压力。建立了有效的旋转失效机制，并假设有关联流规则。分析中考虑了渗透力的影响，渗透力的影响由封闭形式的解决方案描述。主动土压力的推力是从能量守恒方程得出的，然后对优化程序进行编码以获得最关键的解决方案。制作了几套图表来执行参数分析。结果表明，考虑土的内聚力对挡土墙的稳定性有明显的有利影响，而渗流力则有不利影响。考虑抗拉强度极限时，有效土压力会增加，而在较大的内聚力下，这种增加会更加明显。