新管幕通道施工方法对既有线路影响模拟分析  

Simulation Analysis of Influences of Tunnel Construction Using New Tubular Roof Method

作　　者：雷升祥 丁正全[1] 李秀东[2] 李盛 LEI Sheng-xiang;DING Zheng-quan;LI Xiu-dong;LI Sheng(China Railway Construction Co., Ltd., Beijing 100855, China;China Railway 14th Bureau Group Co., Ltd., Jinan 250101, China)

机构地区：[1]中国铁建股份有限公司,北京100855 [2]中铁十四局集团有限公司,山东济南250101

出　　处：《南京工程学院学报（自然科学版）》2021年第3期24-28,共5页Journal of Nanjing Institute of Technology(Natural Science Edition)

基　　金：国家重点研发计划子课题(2018YFC0808702-5)。

摘　　要：依托太原市迎泽大街下穿火车站通道工程,应用离散元仿真软件对新管幕通道施工方法进行模拟,研究施工过程中火车轨道沉降及雨棚柱基础的位移变化.结果表明:通道施工使得铁路轨道呈U形向下沉降,最大沉降量为15.2 mm,出现在土体开挖后通道竖向轴线处;通道施工完后,雨棚柱基础最大水平位移为1.45 mm,位于桩基顶端,最大竖向位移为2.46 mm,位于桩基底端.该研究成果可为通道开挖施工工程提供参考.The new tubular roof method is widely used in constructions of urban underground shallow-buried projects because of its relatively small degree of disturbance,high safety,great social benefits,and no impact on ground transportation.Based on the project of the tunnel crossing of Yingze Street in Taiyuan City,this paper uses FLAC3D simulation software to simulate the construction method of the new tubular roof,and study the train track settlement and the displacement of the canopy column foundation during the construction process.The results show that the tunnel construction causes the railway track to settle down in a U shape,and the maximum settlement is 15.2 mm,which occurs at the vertical axis of the channel after excavation of the soil;after the tunnel construction,the maximum horizontal displacement of the canopy column foundation is 1.45mm,located at the top of the pile foundation,and the maximum vertical displacement is 2.46 mm,located at the base end of the pile foundation.The research results can provide an effective reference for studies of the influence of channel excavation on existing lines.

关 键 词：通道施工 新管幕法 仿真 沉降 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]