浅埋松散破碎围岩隧道施工大变形控制技术  

Large Deformation Control Technology in Construction of Shallow Buried Loose Broken Surrounding Rock Tunnel

作　　者：刘学强 Liu Xueqiang(Fuzhou Planning Design and Research Institute Group Co.,Ltd.,Fuzhou 350108,China)

机构地区：[1]福州市规划设计研究院集团有限公司,福建福州350108

出　　处：《市政技术》2022年第5期82-86,140,共6页Journal of Municipal Technology

摘　　要：当穿越不良地质情况时,隧道开挖常常会出现围岩大变形等灾害,给施工带来很大困难。因此以福州市董奉山4洞隧道进口端浅埋段松散破碎围岩开挖为例,对开挖过程中辅路隧道左洞出现的围岩大变形段进行研究处理,通过建立数值模型和实地监控量测,对大变形断面的拱顶沉降和水平收敛的模型数据结果以及监控量测数据进行了分析。结果显示,通过控制地下水含量、改变施工工法和加强支护可以有效抑制围岩大变形,保持开挖过程中围岩的稳定性。该案例可为类似多洞隧道大变形处置提供经验与参考。When the tunnel through bad geological conditions,the surrounding rock deformation often occurs which brings great difficulties.The inlet section of the shallow buried loose broken surrounding rock excavation at the inlet section of Dongfengshan 4-hole tunnel in Fuzhou is taken as an example.During the excavation,the large deformation section at the left hole of the side road tunnel is studied and managed.Through the establishment of numerical model and the field monitoring measurement,results of the model data of the vault subsidence and horizontal convergence in the large deformation section and monitoring data are analyzed.The results show that controlling groundwater content,changing construction method and strengthening support will effectively control the large deformation and keep the stability of surrounding rock during excavation.This case can provide experience and reference for large deformation treatment of similar multi-hole tunnel.

关 键 词：松散破碎围岩 围岩大变形 监控量测 4洞隧道 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]