基于AHP-3DEC的危岩落石危险性分区与评价  

Hazard zoning and assessment of rockfalls based on AHP-3DEC

作　　者：石润 李嘉雨 陈明浩[2] 贾哲强 邱晓东 SHI Run;LI Jiayu;CHEN Minghao;JIA Zheqiang;QIU Xiaodong(China Communication North Road&Bridge Co.Ltd.,Beijing 100024,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu,Sichuan 610031,China;College of Water Resources and Hydropower,Sichuan University,Chengdu,Sichuan 610065,China)

机构地区：[1]中交路桥北方工程有限公司,北京100024 [2]中铁二院工程集团有限责任公司地勘岩土工程设计研究院,四川成都610031 [3]四川大学水利水电学院,四川成都610065

出　　处：《中国地质灾害与防治学报》2023年第3期127-135,共9页The Chinese Journal of Geological Hazard and Control

基　　金：中国中铁股份有限公司科技开发计划(2021-重点-02);中国国家铁路集团有限公司科技研究开发计划(N2021G005);中铁二院科技开发计划项目(KDNQ213037)。

摘　　要：山区高速铁路受线路平顺性及地形的限制,部分危岩发育地段无法绕避,给工程建设及运营安全提出了严峻挑战。文章在无人机三维倾斜摄影的基础上利用数字地质调绘技术对拟建济南至枣庄铁路杏花峪隧道进口危岩体的发育特征、规模、变形破坏模式进行了准确的判识,通过将3DEC数值模拟与层次分析法结合,获得了崩塌落石的影响范围和危险性分区图,开展了危险性分区评价,提出了防治措施。研究表明:三维倾斜摄影模型识别出的12处危岩带中,只有5号危岩带威胁隧道洞口和桥台安全,并建议采用“被动防护网+明洞”方式进行综合防治。研究成果为危岩落石灾害的危险性分区评价提供参考,为铁路选线及防灾减灾提供依据。Restricted by the surface smoothness and topography,it is impossible for some high-speed railways on mountainous regions to avoid parts of rockfall development sections,posing great safety challenges to construction projects and railway operations.In light of that,this paper laid its focus on the rockfall situated by the entrance of Xinghuayu Tunnel along the proposed Jinan-Zaozhuang Railway project,and leveraged the power of drone-captured 3D aerial photography to perform digital geological survey and mapping so as to accurately identify the development characteristics,scale,as well as modes of deformation and failure of said rockfall.Next,by cross-referencing the results of 3DEC numerical simulation with those from analytic hierarchy process(AHP),color-coded maps highlighting the scope of influence and danger levels of potential rockfalls induced were obtained.Using said maps,zone-by-zone hazard and risk assessment were then performed,based on which corresponding prevention and control measures were put forward.The findings show that among the 12 dangerous rock belts identified from the drone-captured 3D aerial photography model,only Belt No.5 would threaten the safety of the tunnel entrance and bridge abutments,for which the combination of anti-rockfall passive protective netting and an open-cut tunnel structure was recommended as a comprehensive solution.By virtue of the solution’s effectiveness,this study can offer reliable references for not only zone-by-zone hazard and risk assessment for rockfalls,but also railway route selection and disaster prevention and mitigation.

关 键 词：危岩落石 数值模拟 危险性分区 层次分析法 数字地质调绘 

分 类 号：P642.21[天文地球—工程地质学]