碎裂松动岩体高边坡稳定分析及防治

Stability Analysis and Prevention of High Slope with Broken Loose Rock Mass

高陡峡谷地区,碎裂松动岩石的存在对边坡稳定性起到重要影响。针对碎裂松动岩体的定量化指标获取尚无成熟方法、碎裂松动岩体稳定分析困难、防护效果不佳等问题提出一套碎裂松动岩体高边坡稳定分析及防治的解决方案。对碎裂松动岩体特性进行研究,分析其存在的破坏模式;根据碎裂松动岩体的分布范围及主滑动方向进行计算剖分,基于有限元应力的虚功率法对碎裂松动岩体边坡稳定进行分析;最后基于边坡稳定分析结果对碎裂松动岩体边坡不稳定位置采用削坡开挖、喷锚支护、柔性防护网防护以及坡面截排水相结合的处理措施进行防护。

In high and steep gorge area,the existence of broken loose rock plays an important role in slope stability.Focusing on the problems such as the lack of mature method for obtaining quantitative index of broken loose rock mass,the difficulty in stability analysis of broken loose rock mass and poor protection effects,a set of solutions for stability analysis and prevention of high slope of broken loose rock mass are proposed.The characteristics of broken loose rock mass are analyzed,and the existing failure mode is concluded.According to the distribution range and main sliding direction of broken loose rock mass,the slope stability of broken loose rock mass is analyzed based on virtual power method of finite element stress.Finally,based on the results of slope stability analysis,slope cutting excavation,shotcrete anchor support,flexible protection net protection and slope interception and drainage are adopted to protect the unstable position of broken loose rock slope.