【作者】 罗良瑞； 姚爱军； 刘耀轩；

【Author】 LUO Liangrui;YAO Aijun;LIU Yaoxuan;Beijing University of Technology;BCEG Civil Engineering Co., Ltd.;

【机构】 北京工业大学城市建设学部； 北京建工土木工程有限公司；

【摘要】 以北京城市副中心综合管廊工程作为依托,对综合管廊顶进上穿地铁盾构隧道时隧道的变形特征和控制措施进行研究,使用有限元软件分析不同工况下隧道底部的变形规律。结果显示在管廊上穿时隧道会发生上浮变形,通过减少单次顶进长度、采用管廊压重和土层注浆的方法对既有结构的变形都起到了良好的控制作用,其中管廊压重可以使隧道上浮变形减少70%～80%;土层注浆隔离可以使土层应力均匀的分布于隧道全线,避免了应力集中对既有结构的影响;管廊采用小步距开挖顶进最为合理,单次开挖长度控制在1～2 m以内为最佳。更多还原

【Abstract】 Based on the utility tunnel project of Beijing Sub-City Center, the deformation characteristics and control measures of the shield tunnel when the utility tunnel tops crossing the subway shield tunnel from the top are studied.The finite element software is used to analyze the deformation law of the bottom of the shield tunnel under different working conditions. The results show that the floating deformation of the tunnel occurs when the utility tunnel is crossing. The deformation of the existing structure is well controlled by reducing the single jacking length, using the additional pressure and soil grouting. The additional pressure can reduce the floating deformation of the tunnel by 70% ～ 80%. Soil grouting isolation can make the soil stress evenly distributed in the whole tunnel line, avoiding the influence of stress concentration on the existing structure; the utility tunnel using small step excavation jacking is the most reasonable, single excavation length within 1 ～ 2 m is the best.更多还原