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            地铁车站暗挖厅邻近既有线施工技术研究
            • 作者: 岳长城
            论文摘要

            地铁车站暗挖厅邻近既有线施工技术研究

            岳长城

            (中铁十八局集团市政工程有限公司,天津 300222)

            [摘要]北京地铁宣武门站新增3条换乘通道,其中在西南象限设置1座暗挖售检票厅,暗挖厅邻近4号线西南出入口,两者垂直间距仅1.8m,施工风险极高。结合宣武门站西南象限暗挖售检票厅与既有4号线的位置关系和工程与水文地质条件,详细介绍了暗挖厅施工支护方案,同时采用有限元软件对暗挖厅横向断面的开挖支护方案进行了数值模拟,得到了开挖过程中地表沉降、暗挖厅与既有4号线的西南出入口附近土体差异沉降值等计算成果。研究表明,地表沉降的数值计算结果与实测值较为吻合,验证了模拟结果的可靠性;暗挖厅与4号线西南出入口附近土体位移变化量和差异沉降量均符合变形控制值,验证了施工方案的安全性和可行性并且保障了既有线路的安全运营。

            [关键词]地铁;暗挖;既有线;有限元分析;模拟

            [中图分类号]TU753U231    [文献标识码]A     [文章编号]1002-8498(2021)18-0046-05

            Research on Construction Technology of Underground Excavation Hall of the Subway Station near the Existing Line

            YUE Changcheng

            (China Railway 18th Bureau Group Municipal Engineering Co., Ltd., Tianjin 300222, China)

            Abstract: There are three new transfer channels in Xuanwumen Station of Beijing subway, including a hidden excavation ticket inspection hall in the southwest quadrant, and a construction shaft and a horizontal channel for the sale of the ticket inspection hall and the remaining transfer channels. The hidden excavation ticket inspection hall was near the southwest entrance and exit of Line 4, the vertical distance between the two projects is only 1.8m, and the construction risk is extremely high. This paper introduces the construction support plan of the underground excavation hall in detail combining the positional relationship between the underground excavation ticket inspection hall in the southwest quadrant of Xuanwumen Station and the existing Line 4 and engineering geological and hydrological conditions. At the same time, finite element software was used to numerically simulate the excavation and support scheme of the transverse section of the excavation hall. Calculation results such as surface settlement, different settlement values of the soil near the excavation hall and the southwest entrance of the existing Line 4 were obtained. The research shows that the numerical calculation results of the ground settlement are in good agreement with the measured, which verifies the reliability of the simulation results. The displacement and differential settlement of the soil near the excavation hall and the southwest entrance and exit of Line 4 were consistent with the deformation control values, which verifies the safety and feasibility of the construction plan and guarantee the safe operation of the existing lines.

            Keywords:subways;underground excavation;existing line;finite element analysis;simulation

            [作者简介]岳长城,高级工程师,Email1099260402@qq.com

             

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