复杂环境超小间距隧道盾构掘进施工技术  

Excavation Technology of Shield Tunnels with Ultra-small Spacing in Complex Environment

作　　者：孙庆田 王新宇 杨壮志 SUN Qingtian;WANG Xinyu;YANG Zhuangzhi(China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458;College of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000)

机构地区：[1]中铁隧道局集团有限公司,广州511458 [2]河南理工大学土木工程学院,焦作454000

出　　处：《现代隧道技术》2022年第1期200-206,共7页Modern Tunnelling Technology

基　　金：中铁隧道集团科技创新计划重大课题(隧研合2016-18)。

摘　　要：针对浅埋超小间距隧道盾构施工,文章以特拉维夫红线轻轨工程西标段双线盾构施工为工程背景,从隧道加固施工、盾构掘进控制、监测控制与应急管理等方面进行系统研究。结果表明,加固施工在小间距盾构隧道施工中至关重要,可有效降低隧道施工风险;对未加固的小间距盾构隧道施工,应保持土压平稳,加强土压精细化控制;严格控制出渣量,做好渣土改良,控制土体损失率低于0.3%;在盾壳外部注入膨润土或克泥效,可有效地减少邻近隧道的位移量;应结合实时监测数据,控制回填注浆量及注浆质量;隧道施工过程应加强对邻近既有建筑物的监测。As for the shield construction in shallow-buried tunnels with ultra-small spacing, taking the double-line shield tunnel construction of the western bid section of the Tel Aviv Red Line light rail project as the engineering background, this paper conducts a systematic study on various aspects such as tunnel reinforcement construction,shield driving control, monitoring control and emergency management, etc. The results show that reinforcement construction is crucial in the shield tunnelling with small spacing, which can effectively reduce the tunnel construction risks;for the shield construction in unreinforced tunnels with small spacing, the earth pressure should be kept steady with strengthened fine control;the volume of mucking should also be strictly controlled with good soil conditioning, and the ground loss rate should be curbed under 0.3%;injection of bentonite or clay shock to the outside of the shield shell can effectively reduce the displacement of the adjacent tunnel;the backfill grouting volume and quality should be controlled with consideration to the real-time monitoring data;and during the tunnel construction process, adjacent existing buildings should be monitored with strengthened vigor.

关 键 词：复杂环境 超小间距隧道 盾构法施工 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]