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边坡的三维稳定性分析比其二维平面应变模型在理论上更能反映边坡的实际情况。为研究软弱夹层对边坡稳定性的影响,引入三维圆锥体平动破坏机构和牛角状螺旋圆锥体转动破坏机构,建立三维转动-平动组合破坏机构,并通过平面插入的方法实现破坏机构沿边坡的纵向拓展以便用于任意长度的边坡稳定性分析。结合算例分析,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。
The three-dimensional stability analysis of the slope reflects the actual situation of the slope better than the two-dimensional plane strain model. In order to study the influence of soft interlayer on the stability of slope, three-dimensional cone translational failure mechanism and horn-shaped spiral cone rotation failure mechanism are introduced to establish a three-dimensional rotational-translational combined failure mechanism. The planar insertion method is used to realize the failure mechanism along the edge Longitudinal slope expansion for slope stability analysis of any length. Combining with the example analysis, the effectiveness of the method in this paper is verified by comparing with the results of the elasto-plastic finite element numerical simulation. 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.