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软弱夹层、降雨等因素对边坡的整体稳定性有着很大的影响。软弱夹层会使得边坡的破坏形式发生改变,从而降低其稳定性;而降雨不但会使得边坡的稳定性变差,甚至有可能使边坡内形成更加软弱的夹层。但是目前尚未有一个简单合理的方法来分析这种类型边坡的稳定性。基于转动-平动组合破坏机构,提出了一种用于含软弱夹层边坡降雨入渗稳定性极限分析上限法。采用非饱和非稳定渗流分析计算得到的浸润线位置结合降雨后的土体强度及组合破坏机构分析含软弱夹层边坡降雨入渗的稳定性,通过与弹塑性有限元数值模拟结果进行对比,验证了本文方法的有效性。分析表明,组合破坏机构能够很好的用于含软弱夹层边坡的稳定性分析并为实际工程提供一个简单有效的设计方法。
Weak mezzanine, rainfall and other factors have great influence on the overall stability of the slope. The weak interlayer will change the damage form of the slope and thus reduce the stability of the slope. However, the rainfall will not only make the stability of the slope worse, but may even make the slope more weak. However, there is not a simple and reasonable way to analyze the stability of this type of slope. Based on the combined rotational-translational failure mechanism, a method of upper bound method for stability analysis of rainfall infiltration in slopes with weak interbed is proposed. Based on the infiltration line calculated by unsaturated unsteady seepage analysis, the stability of rainfall infiltration with soft interlayer slope was analyzed by combining the strength of soil mass after failure with rainfall and the mechanism of combined failure. By comparing with the elastoplastic finite element numerical simulation, The effectiveness of this method. The analysis shows that the combination failure mechanism can be used to analyze the stability of the slope with weak interlayer and provide a simple and effective design method for practical engineering.