桂林某危岩稳定性评价及治理措施

Stability Evaluation and Mitigation Measures of Rockfall Hazards in Guilin

结合桂林市某山危岩治理工程案例,在仔细研究治理区自然地理条件的基础上,选择赤平投影分析法,对研究区发现的10处待治理危岩的稳定性展开定性分析;同时选择极限平衡法,在预设的两种常见工况条件下重点对3处典型危岩体的稳定性展开定量计算和分析评价。基于该分析比对的结果,对“消除隐患+综合治理”的处置方案进行介绍。研究表明:(1)研究治理区的3处典型危岩状态基本稳定;(2)倾倒式危岩W1、W2在模拟的暴雨工况下稳定系数为0.93~0.96,极易失稳;(3)治理区采用“静态破碎清除+被动防护网+生态种植”的综合治理方法,效果良好,可行性得到证实。

This paper presents a case history of a rockfall mitigation project in Guilin City. Based on the careful study of the natural geographical conditions of the treatment area, this paper utilizes the stereographic projection analysis method as the qualitative analysis on the stability of ten potential rockfall locations. At the same time, the limit equilibrium method is selected for the quantitative evaluation and analysis on the stability of three typical rockfall hazard locations under two preset working conditions. Based on the analytical results and comparative studies, the rockfall mitigation plan with a guideline of “eliminating hidden danger + comprehensive treatment” is implemented. The results show that:(1) the three typical potential rockfall locations in the study area are basically stable;(2) the factor of safety for the toppling failure mode for W1 and W2 is 0.93 ~ 0.96 under the simulated precipitation conditions, which is very easy to lose the stability;(3) the comprehensive treatment method of “static blasting and removal + passive protective net + ecological vegetation” is adopted in the study area, which has a good feasibility as well as a good result. The research conclusions in this paper are expected to provide some references for the relevant hazard prevention and mitigation projects.