盾构长距离穿越房屋安全技术研究  

Safe Shield Tunnelling Under Buildings

作　　者：刘学彦[1,2] 袁大军[1,2] 乔国刚 王飞[1,2] 陈海丰[4] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学隧道与地下工程教育部工程研究中心,北京100044 [3]北京市政建设集团有限责任公司,北京100045 [4]苏州轨道交通有限公司,苏州215003

出　　处：《现代隧道技术》2014年第2期147-151,共5页Modern Tunnelling Technology

基　　金：苏州轨道交通有限公司课题<苏州轨道交通2号线盾构区间下穿建筑物安全控制关键技术研究>的支持项目;项目编号:C11L00630

摘　　要：苏州轨道交通2号线穿越古城区,从480幢各类房屋的正下方或侧面通过,其房屋多为无基础或简单条形基础,易受变形影响发生开裂、崩塌等;再加上2号线穿越粉土和粉砂层,地下水位较高,透水性强,盾构穿越时由于土体扰动极易发生流砂或板结现象,使开挖面失稳。虽然盾构隧道施工技术随着盾构性能的改进有了很大发展,但在上述特殊情况下成功穿越近邻的大量建筑物依然是全新的挑战。文章通过掘进速度,以及浆液材料和注浆量现场试验,确定了盾构穿越房屋时的影响范围,提出了盾构通过时的地表沉降控制标准,并给出了掘进速度、浆液材料组成与配比、注浆量及注浆时机的控制标准,为2号线的安全穿越提供了技术保障。The Suzhou Metro Line 2 passes beneath 480 buildings in the old town of Suzhou. Since most of the buildings have no foundations or have simple strip foundations, they are inclined to crack or collapse due to deformation. Line 2 is constructed in silt and silty sand with a high water table and high water permeability, and potential drift sand or soil hardening can easily result in work-face failure because of soil disturbances caused by shield tunnelling. Although shield tunnelling technology has been developed along with the improvement of shield performance, it is still a new challenge to successfully tunnelling adjacent to a large number of buildings. Based on the driving speed, grouting material and grouting trials on-site, the scope of influence, control standards for surface settlement, driving speed, grout components and mix proportion, grouting volume and grouting time during shield tunnelling are given, which provides technical support for the safe shield tunnelling of the Suzhou Metro Line 2.

关 键 词：盾构下穿施工 安全控制 地表沉降 现场试验 

分 类 号：U458.1[建筑科学—桥梁与隧道工程] U455.43[交通运输工程—道路与铁道工程]