Numerical Simulation Analysis of Critical Length of Instable Failure for Bedding Rock Slope
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摘要: 含有多层软弱夹层的顺层岩质边坡开挖时，边坡失稳破坏范围常常为一有限范围，即存在一个失稳破坏临界长度，该长度对边坡稳定性评价和支挡工程设计有着决定性的影响，而如何确定失稳破坏临界长度，目前在工程实践中尚无较为成熟的解决方案，常凭工程人员的经验确定。笔者在对淮口镇西环线K3+115~K3+215段顺层边坡进行详细调查研究基础上，通过数值模拟，对该含多层软弱夹层的顺层边坡的变形破坏过程、变形破坏范围进行了分析，并与已有变形特征进行了对比，证明采用数值模拟分析其变形破坏过程和失稳破坏临界长度是可行的。失稳破坏临界长度的确定为边坡后续的稳定性计算和支挡工程设计提供了依据，达到了预期目的。因此，笔者的分析方法对具有类似特点的顺层边坡具有借鉴价值。Abstract: In the excavation of bedding rock slope with multi-layer soft interlayer, the failure of slope instability is usually occurred in a limited range, which has been named as "the critical length of instable failure". This length has a decisive impact on the evaluation of slope stability and the design of retaining engineering. However, there is still not a mature solution on how to determine the critical length, that often be determined by the experience. Based on the detailed investigation and study of bedding slope at K3+115~K3+215 section of the Huaikou Town west loop line, the deformation failure process and range of the multi-layer soft interlayer in bedding slope has been analyzed by using the numerical simulation. Compared with the existing deformation characteristics, it is proved that the numerical simulation is feasible to analyze the deformation and failure process and the critical length of instable failure. The critical length determination of instable failure provides a basis for the subsequent stability calculation of slope and the design of retaining engineering, which achieves the expected purpose. Therefore, the analysis method in this paper has reference value for the bedding slope with similar characteristics.
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