摘要
边坡危岩体地质灾害对于大型工程的建设和维护具有较大的潜在隐患。为了对白龙江苗家坝水电站枢纽区边坡危岩体灾害进行分析,使用现场调查、无人机影像解译、三维激光扫描等技术手段进行详细地质灾害调查,明确危岩体的分布与发育特征、变形失稳模式及诱发因素,基于调查结果对危岩体进行定性分级、半定量评价与定量计算,采用Rocfall软件进行模拟计算分析其运动特征。研究表明:危岩体主要分布在泄洪排沙洞出口至右坝肩后部岸坡,共发现54处危岩体及危岩带,其中大型危岩体9处;危岩体以整体滑移-崩落、阶梯状滑移-崩落及楔形滑移-崩落为主要失稳模式,降雨和地震为主要诱发因素;通过地质灾害调查和稳定性计算分析,确定了危岩体的危险性与危害性等级,给出了防治建议。研究成果可为白龙江苗家坝水电站的安全运行及区域地质灾害的有效防控提供支撑。
Geological hazards caused by unstable rock mass on slopes pose considerable potential risks to the construction and operation maintenance of large-scale engineering projects.To analyze the hazards of unstable rock mass on slopes in the hub area of Miaojiaba Hydropower Station on the Bailong River,detailed geological hazard investigations were carried out by means of field surveys,UAV image interpretation,3D laser scanning and other technical methods,so as to clarify the distribution and development characteristics,deformation and instability modes as well as inducing factors of the unstable rock mass.Based on the survey results,qualitative classification,semi-quantitative evaluation and quantitative calculation were conducted on the unstable rock mass,and the Rocfall software was used for simulation and calculation to analyze its movement characteristics.The results show that the unstable rock mass is mainly distributed on the bank slope from the outlet of the spillway and sediment flushing tunnel to the rear of the right dam abutment,with a total of 54 unstable rock masses and unstable rock zones identified,including 9 large-scale unstable rock masses.The main instability modes of the unstable rock mass are integral sliding-collapse,stepped sliding-collapse and wedge sliding-collapse,and rainfall and earthquakes are the primary inducing factors.Through geological hazard investigation and stability calculation analysis,the risk and hazard grades of the unstable rock mass are determined,and corresponding prevention and control suggestions are put forward.The research results provide technical support for the safe operation of Miaojiaba Hydropower Station on the Bailong River and the effective prevention and control of regional geological hazards.
作者
马飞朋
司佳鹏
刘艳领
张墨
侯扬帆
MA Feipeng;SI Jiapeng;LIU Yanling;ZHANG Mo;HOU Yangfan(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Chengdu University of Technology,Chengdu 610000,China)
出处
《西北水电》
2026年第1期74-80,94,共8页
Northwest Hydropower
基金
四川省教育厅重点科研项目(18ZA0045)。
关键词
危岩体
地质灾害
稳定性评价
防治建议
unstable rock mass
geological hazard
stability evaluation
prevention and control suggestion
