青藏高原及邻区地应力对深埋隧道岩爆倾向性影响机制探讨  

INFLUENCE MECHANISM OF IN-SITU STRESS STATE ON ROCK BURST PRONENESS OF DEEP-BURIED-CURVED TUNNEL IN QINGHAI-TIBET PLATEAU AND ITS ADJACENT REGION

作　　者：王惠卿 谭成轩[2,3] 丰成君 张鹏[2,3] 戚帮申 肖锐铧[1,4] 刘艳辉 陈春利 方志伟 苏永超[1] 梁宏坤 王继明[5] WANG Huiqing;TAN Chengxuan;FENG Chengjun;ZHANG Peng;QI Bangshen;XIAO Ruihua;LIU Yanhui;CHEN Chunli;FANG Zhiwei;SU Yongchao;LIANG Hongkun;WANG Jiming(China Institute for Geoenvironmental Monitoring,Beijing 100081,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China;Observation and Research Station of Geological Hazard in Yunnan Ailao-Mountain,Ministry of Natural Resources,Xinping 653400,China;China United Engineering Corporation Limited,Hangzhou 310051,China)

机构地区：[1]中国地质环境监测院,北京100081 [2]中国地质科学院地质力学研究所,北京100081 [3]自然资源部活动构造与地质安全重点实验室,北京100081 [4]自然资源部云南哀牢山地质灾害野外科学观测研究站,新平653400 [5]中国联合工程有限公司,杭州310051

出　　处：《工程地质学报》2023年第3期854-867,共14页Journal of Engineering Geology

基　　金：国家重点研发计划(资助号:2018YFC1505504);中国地质调查局地质调查项目(资助号:DD20190317);国家自然科学基金(资助号:41702341)。

摘　　要：构造活跃区大量工程实例表明,地应力是影响深埋隧道稳定性的重要因素之一。应用三维应力场有限元数值模拟探讨了青藏高原及邻区最大水平主应力方向和隧道轴向夹角φ与侧压力系数K_(H)耦合变化对深埋隧道应变能分布及岩爆倾向的影响。对不同地应力条件下深埋隧道围岩应变能密度分布特征进行了分析,并通过数值分析初步厘定最大水平主应力方向和隧道轴向夹角、侧压力系数与隧道不同关键位置应变能密度的多元回归方程。研究结果表明:最大水平主应力方向和隧道轴向夹角φ=45°左右时,隧道夹角变化对岩爆倾向性影响最大;最大水平主水平应力方向和隧道轴向垂直时,K_(H)变化对围岩应变能密度影响最显著;当最大水平主应力方向和隧道轴向平行时,K_(H)变化对围岩应变能密度影响最小。所厘定的多元回归方程已通过多条青藏高原及邻区典型深埋隧道验证,可用于快速评估夹角和侧压力系数对隧道稳定性的影响,高效服务隧道规划设计。The engineering projects of deep buried tunnels in different positions of tectonic active zone in previous research indicate that the stability of deep tunnels is deeply relevant to in-situ stress.To analyse the influence mechanism of in-situ stress state on rock burst proneness of deep-buried-curved tunnel in Qinghai-Tibet Plateau and its adjacent region,three-dimensional finite element numerical simulation is done to explore the combine action of the angleφbetween the maximum horizontal principal stress orientation and tunnel axis,and lateral pressure coefficient K_(H) on the distribution of strain energy density and rock burst proneness.The results conclude that whenφis about 45°,the change ofφhas the greatest influence on the proneness of rock burst.When the maximum horizontal principal stress orientation is perpendicular to the tunnel axis,the change of K_(H) has the most significant effect on strain energy density of surrounding rock.When the maximum horizontal principal stress orientation is parallel to the tunnel axis,the change of K_(H) has the least influence on strain energy density of surrounding rock.The multivariate regression equation is verified by a number of typical deep buried tunnels in the Qinghai-Tibet Plateau and the surrounding area.The multiple regression equation can be applied to quickly evaluate the influence ofφand K_(H) on tunnel stability serving the tunnel planning and design efficiently.

关 键 词：地应力 应变能密度 岩爆 深埋隧道 青藏高原 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]