隧道开挖卸荷效应诱发断层活化突水数值模拟研究  

Numerical Simulation of Fault Activation Water Inrush Induced by Tunnel Excavation Unloading Effect

作　　者：李杨杨[1,2] 朱慧聪 张士川 杨维弘 王西伟 LI Yangyang;ZHU Huicong;ZHANG Shichuan;YANG Weihong;WAGN Xiwei(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 102206,China;Shaanxi Zhengtong Coal Industry Co.,Ltd.,Xianyang,Shaanxi 713600,China)

机构地区：[1]山东科技大学矿山灾害预防控制-省部共建国家重点实验室培育基地,山东青岛市266590 [2]山东科技大学能源与矿业工程学院,山东青岛市266590 [3]中国矿业大学(北京)能源与矿业学院,北京102206 [4]陕西正通煤业有限责任公司,陕西咸阳市713600

出　　处：《矿业研究与开发》2023年第3期154-159,共6页Mining Research and Development

基　　金：国家自然科学基金项目(51974173,52004147);山东省自然科学基金项目(ZR2020QE129)。

摘　　要：隧道开挖过程中工程岩体卸荷诱发断层活化突水是岩土工程领域的重要研究内容之一。以青岛某地铁站为地质背景,借助COMSOL Multiphysics数值模拟软件,建立不同倾角断层隧道开挖固流耦合模型,对隧道开挖卸荷诱发断层活化引起突水过程中围岩应力场、渗流场进行分析,获得不同倾角断层与开挖卸荷效应的互馈联动机制,明确关键突水点及突水工况。研究结果表明:55°倾角的断层最先活化,其对应力的吸收及阻隔效力最差;随断层倾角增大,断层对开挖卸荷效应的敏感程度降低。渗流场对断层倾角的变化较为敏感,倾角越大,断层汇集导通水能力越强,覆岩渗流场运移变化越快。研究结果可为地铁、隧道、矿山地下开采过程中防治断层活化突水事故提供理论参考。Fault activation water inrush induced by engineering rock mass unloading during tunnel excavation is one of the important research contents in the field of geotechnical engineering. Taking a subway station in Qingdao as the geological background, with the help of COMSOL Multiphysics numerical simulation software, the solid-fluid coupling model of tunnel excavation with different dip angles was established. The stress field and seepage field of surrounding rock in the process of fault activation water inrush induced by tunnel excavation unloading were analyzed, and the interaction mechanism between fault with different dip angles and excavation unloading effect was obtained, and the key water inrush points and water inrush conditions were clarified. The results show that the fault with 55° dip angle is the first to activate, and has the worst effect on stress absorption and barrier. With the increase of fault dip angle, the sensitivity of fault to excavation unloading effect decreases. The seepage field is sensitive to the change of fault dip angle. The larger the dip angle, the stronger the ability of fault to collect and conduct water, and the faster the migration of overburden seepage field. The research results can provide a theoretical reference for the prevention and control of fault activation water inrush accidents in the process of underground excavation in subway, tunnel and mine.

关 键 词：隧道开挖 卸荷扰动 断层活化 突水 数值模拟 

分 类 号：TD325[矿业工程—矿井建设] TU45[建筑科学—岩土工程]