破碎岩体隧道围岩应力承载分布及变形控制研究  

Research on the stress bearing distribution and deformation control of surrounding rock in fractured rock mass tunnels

作　　者：高光辉 GAO Guanghui(The 5th Engineering Co.,Ltd.of China Railway 16th Bureau Group,Tangshan 064099,China)

机构地区：[1]中铁十六局集团第五工程有限公司,河北唐山064099

出　　处：《水利建设与管理》2024年第4期1-5,25,共6页Water Conservancy Construction and Management

摘　　要：本文通过理论分析和数值模拟研究了破碎岩体隧道的围岩应力承载分布规律及变形控制方法。首先,基于主应力差的概念,建立了不同侧压系数下隧洞围岩主应力差的计算模型,结果表明:当λ<1时,隧洞拱腰处主应力差较大;当λ>1时,主应力差峰值向围岩深部转移。然后,采用FLAC3D软件对破碎岩体隧道进行数值模拟,验证了理论计算结果,隧洞拱腰处为变形重点关注区域。最后,结合工程实例,提出了改进方案:采取换拱、加密钢支撑、设置管棚及锚杆等措施,使隧洞围岩变形得到有效控制。This paper investigates the stress bearing distribution of surrounding rock in fractured rock mass tunnels and methods of deformation control through theoretical analysis and numerical simulation.Firstly,based on the concept of the principal stress difference,a computational model for the principal stress difference in tunnel surrounding rock under different lateral pressure coefficients is established.The results show that whenλ<1,the principal stress difference is larger near the tunnel haunches;whenλ>1,the peak value of principal stress difference shifts towards the deeper surrounding rock.Then,FLAC3D is used for numerical simulation of fractured rock mass tunnels,verifying the theoretical results and identifying the tunnel haunches as a critical area for deformation.Lastly,combining with engineering examples,improvement plans are proposed:replacing the arch,reinforcing with dense steel supports,installing pipe sheds and anchor rods,etc.,effectively controlling the deformation of the tunnel surrounding rock.

关 键 词：破碎岩体 应力承载分布 数值模拟 变形控制 

分 类 号：TV52[水利工程—水利水电工程]