岩质反倾边坡复合倾倒破坏分析

Analysis of Anti-dip Rock Slopes Against Composite Toppling Failure

针对岩质反倾边坡滑动倾倒复合破坏的研究不足,首先建立了边坡滑动-块状倾倒-弯曲倾倒复合破坏的地质模型,具体可分为滑动区、块状倾倒区和弯曲倾倒区;然后根据三个分区岩块的破坏机制,提出了各个分区的力学模型;并基于极限平衡理论和悬臂梁模型,提出了边坡滑动-块状倾倒-弯曲倾倒复合破坏的逐步分析方法;最后通过一个工程实例验证了所提地质模型和分析方法的正确性.研究结果表明:岩质反倾边坡滑动-块状倾倒-弯曲倾倒复合破坏的稳定性由滑动-块状倾倒复合破坏区域控制;块状倾倒区域属于主动破坏区域,滑动区属于被动破坏区域,治理加固时应重点加固块状倾倒破坏区.

Aiming at the insufficient research on the complex sliding-toppling failure of anti-dip rock slopes,the geological model of complex sliding-block-flexural toppling failure was constructed,firstly,which contains the sliding,block toppling and flexural toppling zones.Next,based on the failure mechanisms of these three zones,their mechanical models were established,respectively.Then,the stability analysis approach of the complex sliding-block-flexural toppling failure was proposed according to the limit equilibrium theory and the cantilever beam model.Finally,one case study was performed for practical verification on the proposed geomechanics models and analysis approach.The results show that the stability of the complex sliding-block-flexural toppling zones is controlled by the block-flexural toppling zones.Further,the block and flexural toppling zones are active and passive failure zones,respectively.Consequently,the block toppling zone plays a vital role in slope design treatment.