极软流塑地层盾构隧道施工技术研究  

Construction Technology of Shield Tunnel in Extremely-Soft Fluid Plastic Stratum

作　　者：刘吉东 鲍镇杭 LIU Jidong;BAO Zhenhang(Municipal Engineering Company of China Railway Tunnel Group Co.,Ltd.,Hangzhou 310030,Zhejiang,China)

机构地区：[1]中铁隧道局集团有限公司市政工程公司,浙江杭州310030

出　　处：《隧道建设（中英文）》2021年第S02期527-532,共6页Tunnel Construction

摘　　要：为解决盾构在低标贯值极软流塑淤泥层掘进中出现的盾构姿态控制困难、管片碎裂、渗漏水、水平收敛超限等问题,依托杭州地铁2号线庆菱路站—建国路站区间隧道,结合现场实践对极软流塑地层中盾构施工的难点进行分析,提出从主机类型、刀盘开口率、主机重心与形心关系等设备选型入手,辅以掘进前的配重、管片超前量控制、设计优化和掘进中的推力分配、同步注浆、土压力和掘进管理,及掘进后的二次注浆、管片拼装和螺栓复紧、拉板拉紧等措施。经杭州地铁6号线枫桦西路站—之江海洋公园站区间、杭海城际铁路工程实践表明,采取上述措施能够有效解决极软流塑地层的盾构施工难题,降低成型隧道渗漏水率,并减小盾构垂直姿态偏差和水平收敛。The shield will encounter many problems when tunneling in extremely-soft fluid plastic stratum,such as difficult posture control,segment fragmentation,water leakage,and over horizontal convergence.As a result,a case study is conducted on a tunnel between Qingling road station and Jianguo road station of Hangzhou metro line 2.The construction difficulties of shield when tunneling in extremely-soft fluid plastic stratum are analyzed,suggestions are provided regarding host selection,opening rate of cutterhead,and relationship between host gravity and the centroid.Techniques such as thrust balance before driving,synchronous grouting,earth pressure and excavation management,secondary grouting,segment assembly and bolt retightening,and pulling plate tensioning,are also introduced.The applicable results of the recommended methods show that the shield has a good adaptability in extremely-soft fluid plastic stratum,and water leakage,vertical posture deviation,and horizontal convergence are reduced.

关 键 词：盾构隧道 极软流塑地层 管片破碎 盾构姿态 管片上浮 水平收敛 设备选型 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]