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            地鐵車站暗挖廳鄰近既有線施工技術研究
            • 作者: 岳長城
            論文摘要

            地鐵車站暗挖廳鄰近既有線施工技術研究

            岳長城

            (中鐵十八局集團市政工程有限公司,天津 300222)

            [摘要]北京地鐵宣武門站新增3條換乘通道,其中在西南象限設置1座暗挖售檢票廳,暗挖廳鄰近4號線西南出入口,兩者垂直間距僅1.8m,施工風險極高。結合宣武門站西南象限暗挖售檢票廳與既有4號線的位置關系和工程與水文地質條件,詳細介紹了暗挖廳施工支護方案,同時采用有限元軟件對暗挖廳橫向斷面的開挖支護方案進行了數值模擬,得到了開挖過程中地表沉降、暗挖廳與既有4號線的西南出入口附近土體差異沉降值等計算成果。研究表明,地表沉降的數值計算結果與實測值較為吻合,驗證了模擬結果的可靠性;暗挖廳與4號線西南出入口附近土體位移變化量和差異沉降量均符合變形控制值,驗證了施工方案的安全性和可行性并且保障了既有線路的安全運營。

            [關鍵詞]地鐵;暗挖;既有線;有限元分析;模擬

            [中圖分類號]TU753;U231    [文獻標識碼]A     [文章編號]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

            [作者簡介]岳長城,高級工程師,Email1099260402@qq.com

             

            主辦單位:亞太建設科技信息研究院有限公司 中國建筑集團有限公司 中國土木工程學會    承辦單位:施工技術傳媒機構
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