基于倾斜摄影的高位危岩特征获取和稳定性评价——以重庆万州观音山危岩带为例  

Feature acquisition and stability evaluation of high dangerous rock mass based on oblique photography: A case study at Guanyinshan in Wanzhou, Chongqing Province

作　　者：康尘云 KANG Chenyun(Shaanxi Railway Engineering Survey Co.Ltd.,Xi’an,Shaanxi 710043,China)

机构地区：[1]陕西铁道工程勘察有限公司,陕西西安710043

出　　处：《中国地质灾害与防治学报》2022年第5期66-75,共10页The Chinese Journal of Geological Hazard and Control

摘　　要：观音山危岩带对拟建恩广高速万开段庙垭隧道、苎溪河特大桥和临近居民构成安全威胁,急需调查治理,但因危岩地处高位,传统调查、评价手段难以实施。通过地质调查、钻孔取样和室内试验获取基础地质信息;利用倾斜摄影对危岩进行识别、几何特征获取和边界条件分析;以赤平投影法和刚体极限平衡法分别进行危岩带、危岩体的稳定性分析;对不稳定危岩单体利用Rocfall软件进行运动学模拟。结果表明:陡崖发育6处主要危岩单体,体积400~5 000 m^(3)不等;岩体受2组节理面切割和结构面组合控制,整体稳定性较差,易发生坠落式和倾倒式破坏;其中W3、W6危岩体在暴雨工况下处于不稳定状态,对拟建工程形成滚动冲击,动能为5~12 kJ不等。研究结果可以为观音山危岩治理措施的选型、规模提供设计参数,为高位危岩的调查防治提供参考,对利用航测手段提高传统地质调查效率和精度做出了新思考。The Guanyin mountain dangerous rock belt poses a security threat to the Miaoya tunnel of the proposed Wankai section of the Enguang Expressway, as well as Zhuxihe Bridge and the neighboring residents. It is urgent to be investigated and controled. Traditional investigation and evaluation methods are difficult to implement on the high dabgerous rock mass. Basic geological information is obtained through geological survey, drilling sampling and experiments, identification, geometric feature acquisition and boundary condition analysis of the dangerous rock mass are carried out by oblique photography, stability analysis of the dangerous rock belts and the dangerous rock masses are carried out by stereographic projection method and rigid body limit balance method, respectively. Simulation is carried out by Rocfall software for unstable dangerous rock. The results show that the cliffs develop six main dangerous rock zones with a volume of 400-5 000 m^(3), and the rock mass is controlled by two groups of joint surfaces and structural surfaces combination, the overall stability is poor, prone to fall and tipping;among them, the W3 and W6 dangerous rock masses are in an unstable state under heavy rain conditions, forming a rolling impact on the proposed project, and the kinetic energy is 5-12 kJ. The research results can provide design parameters for the selection of the control measures of the dangerous rocks in Guanyin Mountain, and provide reference for the investigation and prevention of high dangerous rock mass, it puts forward new idea on the use of aerial survey methods to improve the efficiency and accuracy of traditional geological surveys.

关 键 词：危岩 倾斜摄影 稳定性 落石模拟 防灾措施 

分 类 号：P642[天文地球—工程地质学]