江西某铁路隧道地应力特征及岩爆预测分析  

Analysis on Crustal Stress Characteristics and Rock Burst Prediction of a Railway Tunnel in Jiangxi Province

作　　者：王斌[1] 董志宏[1] 刘元坤[1] 韩晓玉[1] 艾凯[1] 周春华[1] 齐放 WANG Bin;DONG Zhihong;LIU Yuankun;HAN Xiaoyu;AI Kai;ZHOU Chunhua;QI Fang(Key Laboratory of Geomechanics and Geotechnical Engineering of Ministry of Water Resources,Changjiang River ScientificResearch Institute,Wuhan 430010,Hubei,China;Information and Communication Branch of State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430074,Hubei,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]国网湖北省电力有限公司信息通信公司,湖北武汉430074

出　　处：《工程技术研究》2023年第22期6-8,33,共4页Engineering and Technological Research

基　　金：云南省重大科技专项计划项目(202002AF080003、202102AF080001);中央级公益性科研院所基本科研业务费项目(CKSF2021462/YT、CKSF2023308/YT、CKSF2023316/YT)。

摘　　要：江西某铁路隧道工程区构造和应力环境较为复杂,查明其现今地应力特征对于铁路线路工程地质条件评价和隧道科学施工有重要的指导作用。因此,文章采用水压致裂法在该隧道围岩中进行原地应力测量,根据实测数据对该段隧道的现今地应力特征进行分析,并结合深埋隧道工程参数特征,对其围岩稳定性进行评价。结果表明:隧址区水平主应力总体上随深度的增加而增大,钻孔位置的最大水平主应力方向为NE35°,最大水平主应力方向侧压系数为1.3~1.7,以水平应力为主导;在现今应力场条件下,隧道围岩岩爆风险随围岩埋深的增加而增大,白云岩围岩埋深超过298 m后存在发生轻微岩爆的可能,石英砂岩围岩埋深超过304 m后存在发生中等岩爆的可能,在施工中需要注意防范。The structure and stress environment of a railway tunnel engineering area in Jiangxi Province are relatively complex.Identifying its current crustal stress characteristics has an important guiding role for the evaluation of railway line engineering geological conditions and the scientific tunnel construction.Therefore,this paper uses the hydraulic fracturing method to measure the in-situ stress in the surrounding rock of the tunnel.According to the measured data,the current crustal stress characteristics of the tunnel are analyzed,and the stability of the surrounding rock is evaluated in combination with the characteristics of the engineering parameters of the deep buried tunnel.The results show that the horizontal principal stress in the tunnel area generally increases with the increase of depth.The maximum horizontal principal stress direction of the drilling position is NE35°,and the lateral pressure coefficient in the direction of the maximum horizontal principal stress is 1.3-1.7,which is dominated by horizontal stress.Under the condition of current stress field,the risk of rock burst in tunnel surrounding rock increases with the increase of buried depth of surrounding rock.When the buried depth of dolomite surrounding rock exceeds 298 m,there is a possibility of slight rock burst.When the buried depth of quartz sandstone surrounding rock exceeds 304 m,there is a possibility of medium rock burst,which needs to be paid attention to during construction.

关 键 词：铁路隧道 水压致裂法 地应力测量 岩爆 围岩稳定性 

分 类 号：U456.33[建筑科学—桥梁与隧道工程]