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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。
In order to reduce the settlement of the buildings caused by the double shield tunneling, FLAC 3D was used to simulate the strata settlement induced by the double tunnel with different construction schemes, The construction parameters of left steel ring inner support + double wire pipe grouting reinforcement program are optimized, and relevant engineering actual measurement and analysis are carried out. The results show that the differential settlement of buildings caused by the original scheme is 26.5 mm, which is far beyond the control standard of 10 mm. Both the inner support of the left steel wire ring and the pipe grouting reinforcement by the double wire pipe Can make the differential settlement of buildings meet the requirements; optimizing right shield parameters can reduce the impact on the building; construction load and grouting pressure are the main factors that affect the first left- Construction is necessary. The ultra-close-distance double-line shield successfully passes through the buildings and the related results can provide reference for similar projects.