中文摘要：

地铁隧道施工对周围管线的影响已成为地铁工程中的重点和难点。研究地铁隧道盾构施工对周围邻近管线的变形影响规律,并据此对管线进行合理保护是地铁等隧道建设中面临的普遍任务。以西安地铁3号线为研究背景,通过FLAC数值模拟,得到了多种工况下地铁隧道盾构施工对邻近垂直于地铁线路的管线变形影响规律。研究表明,地铁盾构施工时,对周围环境的影响大小是不一样的,管线的沉降最大值处均位于隧道轴线正上方,且随着管隧距离的缩短,管线沉降最大值不断增大,因隧道盾构施工而对管线的变形影响范围逐渐减小,沉降曲线的沉降槽宽度逐渐减小;管线在距隧道轴线±1.6倍洞径范围内随管隧距离的减小沉降值逐渐增大,反之,其变形减小;随着土仓压力的增大,地下管线的变形越来越小,甚至可能产生向上隆起。工程实践表明,预测结果和监测结果基本一致。

英文摘要：

The influence on adjacent existing pipelines due to metro tunnel construction has become the key and difficult problems of metro engineering. Studying on the influence law of deformation for surrounding adjacent pipelines due to shield construction of metro tunnel,and accordingly to conduct reasonable protection on pipelines are the common tasks faced in the construction of metro tunnel. Taking the Line 3 in Xi＇an Metro as the research background,the influence law of deformation for adjacent pipelines perpendicular to the metro line due to shield construction of metro tunnel under multi engineering conditions was obtained by using of FLAC numerical simulation.The results showed that the influence on surrounding environment due to metro shield construction is different. The maximum value of pipeline settlement is located just above the tunnel axis line,and with the decrease of distance between pipeline and tunnel,the maximum value of pipeline settlement increases,the influence scope of deformation for the pipeline due to shield construction of metro tunnel decreases gradually,and the width of settling tank insettlement curve reduces. The settlement of pipeline increases gradually with the reduced distance between pipeline and tunnel in the range of ± 1. 6 times tunnel diameter from tunnel axis,conversely,the deformation of pipeline decreases. With the increasing pressure of soil chamber,the deformation of underground pipeline decreases,and even lead to upward uplift. The engineering practice showed that the prediction results were basically consistent with the monitoring results.