块裂层状岩质边坡稳定性极限分析上限解

Upper Bound Solution of Limit Analysis for The Stability of Block-layered Rock Slope

摘要:

与一般层状岩质边坡相比，具有“砌块式”结构特征的块裂层状岩质边坡，其破坏模式具有较大差别。本文采用室内模型试验仿真构造了顺层和反倾斜块裂层状岩质边坡，分别定性地确定了可能出现的两种类型边坡的破坏模式，并根据实际工程中可能出现的边坡破坏特征，进一步拓展了这两种类型边坡的破坏模式，使其更具有普遍性。然后根据极限分析上限法基本原理，对室内模型试验结果进行分析求解，验证了极限分析上限法在该类型边坡稳定性分析中的适用性，并使极限分析上限法演绎到普遍破坏模式中。这进一步拓展了极限分析法的应用范围，为块裂层状岩质边坡稳定性分析提供了一种有效的分析手段。

Abstract:

A block-layered rock slope with a special block structure has a greater difference from a general layered rock slope in failure modes. In this paper, the bedding and anti-dip block-layered rock slopes are modeled in detail by indoor tests and the possible failure modes of two typical block-layered rock slopes are qualitatively determined. And the failure modes are extended to a general state based on the possible failure characteristics in practical engineering. In addition, the cases of the indoor model tests are analyzed using upper bound limit analysis method. The results show that the upper bound limit analysis method has a good performance to the stability analysis of a block-layered rock slope. Finally, the upper bound limit analysis method is deducted to a general failure mode of a block-layered rock slope. This extent application of the upper bound limit analysis method is developed to an effective approach for the stability analysis of a block-layered rock slope.