深埋高地应力TBM隧道岩爆倾向性影响因素分析  

Analysis of Influencing Factors of Rockburst Tendency of Deep Buried TBM Tunnel with High Ground Stress

作　　者：高新强[1] 杨腾杰 戴尚坤 樊浩博 朱正国[1] 赵静波[2] GAO Xinqiang;YANG Tengjie;DAI Shangkun;FAN Haobo;ZHU Zhengguo;ZHAO Jingbo(Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;China Railway 18th Bureau Group Corporation Limited,Tianjin 300222,China)

机构地区：[1]石家庄铁道大学,石家庄050043 [2]中铁十八局集团有限公司,天津300222

出　　处：《铁道工程学报》2024年第11期59-65,共7页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司度科技重大专项(2019-A05);石家庄铁道大学研究生创新资助项目(YC2023070)。

摘　　要：研究目的:岩爆灾害在深埋高地应力硬岩隧道建设过程中最为突出,因此明确影响岩爆发生的主要因素对岩爆灾害的预测和防治有重要意义。本文以西南地区某新建山岭TBM隧道为工程背景,在对岩爆发生条件总结分析的基础上,基于FLAC3D软件建立TBM隧道掘进数值模型,分析地应力和围岩强度对岩爆倾向性的影响;然后采用博弈组合赋权-灰色关联分析的方法确定不同因素对岩爆倾向性的影响程度。研究结论:(1)高储能脆性岩体、足够能量来源和工程开挖卸荷为隧道岩爆的产生条件;(2)岩爆倾向性随着埋深的增大逐渐增加,侧压系数<1.0时,边墙处岩爆倾向性最大;侧压系数>1.0时,拱顶(拱底)处岩爆倾向性最大,随着侧压系数的增大,拱顶和拱肩处岩爆倾向性逐渐增加,边墙处岩爆倾向性逐渐减小;(3)岩爆倾向性随着黏聚力的增加呈小幅增大,内摩擦角较小时,随着内摩擦角的增加岩爆倾向性逐渐增大,但内摩擦角越大其对岩爆倾向性影响越小;(4)不同因素对岩爆倾向性的影响程度为:埋深>内摩擦角>侧压系数>黏聚力;(5)本研究成果可为高地应力隧道岩爆预测的影响因素确定提供支撑,同时也可为岩爆灾害防治提供借鉴。Research purposes:Rockburst disasters are most prominent in the construction of deep-buried highground stress hard rock tunnels,and the clear influence of the main factors affecting the occurrence of rockbursts is of great significance for the prediction and prevention of rockburst disasters.This paper takes a new mountain TBM tunnel in southwest China as the engineering background,based on the summary analysis of the conditions of rock explosion,based on the FLAC3D software to establish a numerical model of the TBM tunnel boring,analyze the impact of the ground stress and the strength of the surrounding rock on the propensity to rock explosion;and then use the game combination of empowerment-gray correlation analysis to determine the degree of influence of different factors on the propensity to rock eruption.Research conclusions:(1)High energy storage brittle rock mass,sufficient energy source,and engineering excavation unloading are the conditions for the occurrence of tunnel rockburst.(2)Rockburst propensity increases gradually with the increase in depth of burial.Lateral pressure coefficient<1.0,the side wall of the largest rock explosion tendency;lateral pressure coefficient>1.0,the arch(arch bottom)at the largest rock explosion tendency.With the increase in lateral pressure coefficient,the arch and arch shoulder rock explosion propensity gradually increased,and the side wall rock explosion propensity gradually decreased.(3)The rockburst tendency increases slightly with an increase in cohesion.When the internal friction angle is small,the rockburst tendency increases with the increase of the internal friction angle,but the larger the internal friction angle,the smaller the influence on the rockburst tendency.(4)The degree of influence of different factors on the rockburst propensity is burial depth>internal friction angle>lateral pressure coefficient>cohesion.(5)The results of this study can provide support for the determination of influencing factors of rockburst prediction in high-ground stress tunnels and

关 键 词：高地应力隧道 TBM 岩爆倾向性 影响因素 数值模拟 灰色关联分析 博弈组合赋权 

分 类 号：TU452[建筑科学—岩土工程]