山岭隧道围岩稳定性分析及管棚支护优化研究  

Study on Stability Analysis of Surrounding Rock and Optimization of Pipe Roof Support in Mountain Tunnel

作　　者：刘俭 LIU Jian(The 4th Engineering Co.,Ltd.of China Railway 18th Bureau Group,Tianjin 300350,China)

机构地区：[1]中铁十八局集团第四工程有限公司,天津300350

出　　处：《施工技术(中英文)》2025年第4期67-73,共7页Construction Technology

摘　　要：以都江堰至四姑娘山山地轨道交通工程箭竹隧道为研究对象,基于数值模拟和现场监测数据,系统研究了围岩变形特征及管棚支护参数对围岩稳定性的影响规律。通过建立三维有限元模型,模拟不同施工工况下围岩应力场和位移场的变化,分析管棚直径、布置间距、布置范围及超前注浆厚度等参数对围岩变形控制效果的影响。研究结果表明:增大管棚直径和布置范围能显著降低拱顶沉降,提高支护效果;减小管棚布置间距能有效控制围岩变形;超前注浆加固厚度对围岩稳定性影响显著,600mm注浆厚度下拱顶沉降较未注浆时减小40%以上。现场监测数据验证了数值模拟的准确性,表明优化后的管棚支护方案能有效控制围岩变形,确保施工安全。Taking Jianzhu Tunnel of Dujiangyan—Siguniang Mountain Rail Transit Project as the research object,based on numerical simulation and field monitoring data,the influence of surrounding rock deformation characteristics and pipe roof support parameters on surrounding rock stability was systematically studied.By establishing a three-dimensional finite element model,the changes of stress field and displacement field of surrounding rock under different construction conditions are simulated,and the influence of parameters such as pipe shed diameter,layout spacing,layout range and advanced grouting thickness on the deformation control effect of surrounding rock is analyzed.The results show that increasing the diameter and layout range of the pipe shed can significantly reduce the settlement of the vault and improve the support effect.Reducing the spacing of pipe sheds can effectively control the deformation of surrounding rock.The thickness of advance grouting reinforcement has a significant effect on the stability of surrounding rock.The settlement of vault under 600mm grouting thickness is reduced by more than 40%compared with that without grouting.The accuracy of the numerical simulation is verified by the field monitoring data,which shows that the optimized pipe shed support scheme can effectively control the deformation of surrounding rock and ensure the construction safety.

关 键 词：隧道 围岩 管棚支护 超前注浆 稳定性 沉降 数值模拟 

分 类 号：U451[建筑科学—桥梁与隧道工程]