考虑流固耦合效应深埋富水隧道围岩稳定性研究  

Surrounding Rock Stability of Deep Buried Water-rich Tunnel in Consideration of Fluid-solid Coupling

作　　者：张向东[1] 李亦芃 李庆文 殷增光 ZHANG Xiang-dong;LI Yi-peng;LI Qing-wen;YIN Zeng-guang(College of Civil Engineering and Transportation,Liaoning Technical University,Fuxin 123000,China;School of Civil Engineering and Architecture,Liaoning University of Technology,Jingzhou 121000,China;The Fourth Civil Engineering Co.,Ltd.of CAREC Shanghai Group,Tianjing 300000,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁工业大学土木建筑工程学院,辽宁锦州121001 [3]中铁上海工程局集团第四工程有限公司,天津300000

出　　处：《长江科学院院报》2018年第10期98-103,108,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金委员会-神华集团有限公司煤炭联合基金资助项目(51174268)

摘　　要：针对渗流条件下的深埋富水隧道围岩稳定性问题,依托老獾顶隧道工程,对DK16+110-DK16+130段进行现场监测,采用流固耦合理论与反演理论,基于FLAC3D数值软件对该区段开挖过程进行数值模拟,与监测结果进行比较分析。研究结果表明:下左台阶开挖后两帮孔隙水压力梯度变化非常快,在仰拱开挖后应力与孔隙水压力变化趋于平稳;通过对孔隙水压力与应力的比值分析得到隧道围岩开挖风险预测函数α,确定了该地质条件下掌子面最危险开挖深度;当隧道围岩开挖风险预测函数值α>4.51时,掌子面极易发生失稳,需要对其排水降压;预测函数具有较高精度,为后续工程提供参考。To study the surrounding rock stability of deep buried water-rich tunnel in the presence of seepage,we conducted numerical simulation of the excavation process of a tunnel project in FLAC 3D in consideration of fluid-solid coupling,and further compared the simulation result with field monitoring result.The comparison revealed that the gradient of pore water pressure changed rapidly after the left bottom sidestep was excavated,indicating that water burst would probably occur at both sides along with tunnel excavation;the stress and pore water pressure tended to be stable after the excavation of inverted arch.Furthermore,we proposed an excavation risk function according toα,which is defined as the ratio of pore water pressure to stress,to determine the most dangerous depth of working face excavation.Whenαis larger than 4.51,the working face is extremely prone to suffer from instability,indicating that drainage is required.The predicative function is of high accuracy,hence could offer reference for future projects.

关 键 词：隧道工程 流固耦合 反演理论 现场监测 数值模拟 预测函数 

分 类 号：U45[建筑科学—桥梁与隧道工程]