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小间距双线隧道近距离下穿运营中的地铁车站,会造成既有结构沉降变形,影响运营安全。本文针对南水北调北京西四环暗涵穿越五棵松车站工程的特点,提出了限速运营沉降控制标准,制定了穿越施工方法及预加固方法,并建立了三维有限元模型,预测了既定施工方法下车站及地表的沉降,并通过数值模拟分析了穿越段双线隧道工作面错距、注浆横通道与车站结构间距以及长管注浆加固效果对沉降的影响;结果显示保证6 m的工作面错距可以减小变形缝差异沉降,注浆通道与车站结构的距离对既有结构沉降影响不大。最后将数值模拟结果与监测数据进行了对比。
The small distance double-track tunnel under the subway station in operation, will cause the existing structure settlement deformation, affecting operational safety. In this paper, according to the characteristics of Wukesong station project of culvert passing through the Western Fourth Ring Road of Beijing South Water Diversion Project, the paper puts forward the control standard of speed limit for operation settlement, establishes the crossing construction method and pre-reinforcement method, and establishes the three-dimensional finite element model to predict the established construction method The station and surface subsidence. Through the numerical simulation, the influence of the displacement of the working face of the double-line tunnel across the section, the distance between the grouting cross-track and the station structure and the reinforcement effect of the long pipe grouting on the settlement are analyzed. The results show that the work of 6 m Surface offset can reduce the differential settlement of deformation joints. The distance between grouting channel and station structure has little effect on the settlement of existing structures. Finally, the numerical simulation results are compared with the monitoring data.