巨型危岩体预加固研究  

Research on Pre-Reinforcement of Giant Dangerous Rock Mass

作　　者：张治平 夏志雄 杨诗源 袁坤 ZHANG Zhiping;XIA Zhixiong;YANG Shiyuan;YUAN Kun(China Academy of Railway Sciences(Shenzhen)Research and Design Institute Co.,Ltd.,Shenzhen Guangdong 518063,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]铁科院(深圳)研究设计院有限公司,广东深圳518063 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《中国铁道科学》2022年第6期29-38,共10页China Railway Science

基　　金：中国铁道科学研究院集团有限公司院基金课题(2020YJ030)。

摘　　要：以渝怀铁路白马隧道进口仰坡上方1#巨型危岩体为研究对象,基于现场调查和勘察数据,进行该巨型危岩体危害性分析和评价;采用离散元和极限平衡法,进行该巨型危岩体的稳定性分析计算;针对不利工况进行巨型危岩体预加固分析计算。结果表明:由于危岩体体积巨大,上部危岩体背后裂缝全部贯通,在地震作用的不利工况条件下倾覆力矩为500033.29 kN·m,滑移力为97373.36 kN,安全稳定系数只有0.744,危岩体整体处于欠稳定状态,极易产生沿上下层分界处的倾倒式破坏或沿底部缓倾结构面的滑移式破坏;通过在稳定岩体中锚固直径60 mm大型钢丝绳,按3 m间距对危岩体进行水平和竖向捆绑预加固,可将危岩体的安全稳定系数提高到1.15,可确保原位锚固整治工程安全和成功实施。Taking the 1#giant dangerous rock mass above the entrance slope of Baima Tunnel on ChongqingHuaihua Railway as the research object,based on field investigation and survey data,the hazard analysis and evaluation of the giant dangerous rock mass are carried out.Discrete element method and limit equilibrium method are used to conduct the stability analysis and calculation of the giant dangerous rock mass and to carry out its pre-reinforcement targeting on adverse working conditions.The results show that because of the huge size of dangerous rock mass,the cracks behind the upper part of the dangerous rock mass are all penetrated;the overturning moment is 500,033.29 kN·m,the sliding force is 97,373.36 kN,and the safety stability coefficient is only 0.744 under adverse working conditions regarding seismic action.The dangerous rock mass is in a less stable state as a whole,which is very likely to cause toppling failure along the boundary between the upper and the lower layers or sliding failure along the gently dipping structural plane at the bottom.With a giant wire rope of 60 mm in diameter anchored in the stable rock mass and the horizontal and vertical bundling prereinforcement of the dangerous rock mass being carried out with 3 m intervals,the safety stability coefficient of the dangerous rock mass can be increased to 1.15,which can ensure the safe and successful implementation of in-situ anchoring treatment project.

关 键 词：渝怀铁路 隧道 巨型危岩体 危害性 稳定性 预加固 

分 类 号：U418.5[交通运输工程—道路与铁道工程]