基于强度折减法的地下洞室岩体破坏与预警指标研究  

Research on Rock Mass Failure and Early Warning Index for Underground Caverns Based on Strength Reduction Method

作　　者：李俊彦 彭振华 王金昌 郭鸿雁[2] LI Junyan;PENG Zhenhua;WANG Jinchang;GUO Hongyan(CNOOC Petrochemical Engineering Co.,Ltd.,Qingdao 266000,Shandong,China;China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400000,China)

机构地区：[1]中海油石化工程有限公司,山东青岛266000 [2]招商局重庆交通科研设计院有限公司,重庆400000

出　　处：《工程技术研究》2023年第15期15-17,共3页Engineering and Technological Research

摘　　要：随着地下洞室的迅速发展,其围岩稳定性与预警指标受到关注。文章基于强度折减法,采用数值模拟研究了不同施工方法下地下洞室的拱顶变形规律,以及隧道洞室的破坏模式,提出了以开挖完成后拱顶沉降随掌子面距离的变化曲线为地下洞室开挖的施工预警指标。结果表明:完成开挖后的拱顶沉降临界破坏曲线随掌子面距离的变化曲线可作地下洞室开挖的施工预警指标,呈现三段不同的区域变化;采用分四层开挖时围岩安全系数略小于分三层开挖;随着强度折减系数的增大,地下洞室左右边墙围岩出现局部破坏,随后,地下洞室周围发生局部失稳破坏,最后,地下洞室发生整体失稳破坏。With the rapid development of underground caverns,the stability and early warning index of their surrounding rocks have received much attention.Based on the strength reduction method,the deformation law of the vault of the underground cavern under different construction methods and the failure mode of the tunnel cavern are studied by numerical simulation.The change curve of the vault settlement with the distance from the tunnel face after the excavation is proposed as the construction early warning index for the underground cavern excavation.The results show that the change curve of the critical failure curve of vault settlement with the distance from the tunnel face after excavation can be used as the construction early warning index for the underground cavern excavation,showing three periods of different regional changes.The safety factor of surrounding rock is slightly lower than that of excavating in three layers when four-layer excavation is adopted.With the increase of the strength reduction coefficient,local failure occurs in the surrounding rock of the left and right walls of the underground cavern.Subsequently,the local instability failure occurs around the underground cavern.Finally,the overall instability failure occurs in the underground cavern.

关 键 词：强度折减法 隧道围岩 安全系数 预警指标 

分 类 号：TU452[建筑科学—岩土工程]