盾构长距离穿越房屋安全技术研究

发布时间：2018-05-31 23:20

本文选题：盾构下穿施工 + 安全控制　；参考：《现代隧道技术》2014年02期

【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。
[Abstract]:Suzhou Rail Transit Line 2 passes through the ancient urban area and passes directly or sideways of 480 buildings. The buildings are mostly without foundation or simple strip foundation, which are prone to crack and collapse due to deformation. In addition, through silt and silt layer, Line 2 has high groundwater level and strong water permeability. The excavating surface is unstable because of the disturbance of soil in shield tunneling. Although the construction technology of shield tunnel has developed greatly with the improvement of shield tunneling performance, it is still a new challenge to successfully pass through a large number of adjacent buildings under the special circumstances mentioned above. Based on the field test of tunneling speed, grouting material and grouting quantity, the influence range of shield passing through the building is determined, the control standard of ground subsidence is put forward, and the tunneling speed, composition and proportion of slurry material are given. The control standard of grouting quantity and grouting timing provides technical guarantee for the safe crossing of Line 2.
【作者单位】：北京交通大学土木建筑工程学院;北京交通大学隧道与地下工程教育部工程研究中心;北京市政建设集团有限责任公司;苏州轨道交通有限公司;
【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
【分类号】：U458.1

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