超近距双线隧道旁穿建筑群的信息化施工风险控制

doi:10.6040/j.issn.1672-3961.0.2016.276

摘要/Abstract

摘要： 为减轻双线盾构隧道旁穿引起的建筑物沉降,采用FLAC^3D对不同施工方案的双线隧道旁穿建筑物引起的地层沉降进行数值模拟,对实施的右线隧道变线+左线钢环内支撑+双线花管注浆加固方案的施工参数进行优化,并进行相关的工程实测分析。结果表明:原方案造成的建筑物差异沉降为26.5 mm,远超其10 mm的控制标准;采用排桩加固或右线变线后左线钢环内支撑和双线花管注浆加固方案均能使建筑物差异沉降满足要求;优化右线盾构参数可减轻对建筑物影响;施工荷载和注浆压力是后行右线影响先行左线受力状态的主要因素,采用实时监测的信息化施工是必要的。超近距离双线盾构顺利旁穿建筑物群,相关结果可为类似工程提供借鉴。

关键词: 超近距双线, 旁穿建筑物群, 信息化施工, 风险控制, 盾构隧道

Abstract: To reduce the building subsidence induced by nearby passing twin shield tunnels, the FLAC^3D was adopted to numerical simulate and analyze the different shield tunnel excavation methods induced the closest building ground settlement. The shield tunneling parameters were optimized for adopted construction method that changed the right line direction with internal cross bracing in left line, and with twin lines reinforcement by tube grouting in surrounding ground. And the related site surveying parameters were presented and analyzed. The results showed that: the previous construction method induced the building differential settlement was 26.5 mm, which was severely beyond the 10 mm limit; piling between buildings and tunnels or internal cross bracing in left line and twin lines tube grouting in surrounding ground were all applicable reinforcement methods to meet 10 mm limit of building differential settlement; it reduced effectively construction induced building settlement by optimizing right line tunneling parameters; the main parameters of later excavated tunnel influence on previous constructed tunnel were tunneling load and grouting pressure, the use of real-time monitoring and information construction was necessary. The extremely close twin shield tunnel successfully nearby passed the buildings, and the results could be consulted for similar projects.

Key words: shield tunnel, nearby passing intensive buildings, informative construction, risk control, extremely close twin lines

中图分类号:

TU94

刘纪峰,杨欢欢. 超近距双线隧道旁穿建筑群的信息化施工风险控制[J]. 山东大学学报(工学版), 2017, 47(3): 102-111.

LIU Jifeng, YANG Huanhuan. Risk control of extremely close twin shield tunnels nearby passing intensive buildings based on informative construction[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2017, 47(3): 102-111.

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