内江朝阳危岩灾害特征分析及其治理技术

Characteristic Analysis and Control Technology of ChaoyangDangerous Rock Disaster in Neijiang

以内江市某工程朝阳危岩为例,通过对危岩地质灾害体规模和空间分布、形状特征、结构特征和运动特征进行调查,并且对危岩崩落运动水平速度、石块腾越、弹跳和落石能量进行了计算.根据治理区危岩体的形成,结合危岩体基座特征、后缘裂隙发育特征和前缘临空状况,对危岩变形破坏模式进行了分析,在已有危岩WY1、WY2和WY4崩塌分析结果的基础上,对危岩的稳定性进行了分析.结果表明,在工况Ⅱ和工况Ⅲ条件下,危岩WY1、WY2和WY4处于欠稳定状态.通过几种方案比选及方案进一步优化和细化,得到优化的危岩治理方案为清除危石+锚杆锚固+砂浆填缝+扩建截水沟,并对方案具体实施及其实施效果进行了评价,具有明显的经济和社会效益,对类似工程具有一定的参考价值.

Taking the project of Chaoyang dangerous rock in Neijiang city as an example,the size and spatial distribution,shape characteristics,structure characteristics and movement characteristics of dangerous rock geological hazard body are analyzed,and the horizontal velocity of dangerous rock falling movement,rock leaping,bouncing and rock falling energy are calculated.According to the formation of dangerous rock in the control area,the deformation and failure mode of dangerous rock are analyzed based on the study of the characteristics of the base of dangerous rock,the development characteristics of cracks in the back edge,and the front space condition.Based on the existing collapse analysis results of dangerous rock WY1,WY2,and WY4,the stability of dangerous rock is analyzed.The results show that under the condition of working conditionⅡand working conditionⅢ,the dangerous rock WY1,WY2 and WY4 are in an under-stable state.Through the comparison and selection of several schemes and further optimization and refinement of the scheme,the optimized scheme of dangerous rock treatment is obtained,which consists of dangerous rock removal+anchor bolt anchoring+mortar filling+expansion ditch cutting.The practical implementation and implementation effect of the scheme are evaluated,which has obvious economic and social benefits and has certain reference value for similar projects.