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以北京市轨道交通6号线某区间盾构隧道工程实例为背景,针对双线盾构掘进先后通过临近高层建筑物的特殊情况,首先通过FLAC3D软件对该工程进行数值模拟,分析了先后盾构掘进两条平行隧道时地表最大沉降值的位置,以及盾构掘进与临近建筑物相互作用对地表沉降的影响;其次,对盾构掘进先后穿过高层建筑物的实测数据进行了分析,获得了双线盾构顺序穿越临近高层建筑物过程中地表沉降的变化规律;最后,分析了盾构施工对临近高层建筑物的影响.结果表明:在盾构面前方20 m作用的范围内,地表略微隆起,而盾构通过40 m后地表沉降基本稳定;后行隧道引起的地表沉降大于先行隧道引起的地表沉降;临近高层建筑物在隧道沉降槽影响范围内时,盾构施工对建筑物影响较大,而与双线隧道的先后施工顺序关系不大,数值计算和实测结果相符,对类似工程有一定的借鉴和指导意义.
Taking the example of a certain interval shield tunnel project of Beijing Metro Line 6 as a background, aiming at the special case of double-line shield tunneling approaching high-rise buildings, the project is firstly simulated by FLAC3D software, Tunneling two parallel tunnels when the maximum settlement of the surface value of the location, as well as the impact of shield tunneling and adjacent buildings on the impact of surface subsidence; Secondly, the shield tunneling has passed through the high-rise buildings of the measured data were obtained, obtained Finally, the influence of shield construction on the adjacent high-rise buildings is analyzed.The results show that within 20 m of front of the shield, the ground surface is slightly The ground settlement caused by the back tunnel is larger than the ground settlement caused by the previous tunnel; when the tunnel is near the settlement of the tunnel, the impact of the shield construction on the buildings is more significant Large, and with the double tunnel construction sequence has little to do, the numerical calculation and the measured results in line with similar projects have some reference and means Guide meaning.