盾构隧道下穿高铁路基变形分析及影响因素研究  

Research on Deformation Analysis and Influencing Factors of Shield Tunnel Passing Down the High-Speed Railway Foundation

作　　者：王立新[1,2] 高洋 苗苗 汪珂 李储军[1] 赖金星 邱军领[3] WANG Lixin;GAO Yang;MIAO Miao;WANG Ke;LI Chujun;LAI Jinxing;QIU Junling(China Railway First Survey and Design Institute Group Ltd,Xi’an,Shanxi 710043,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an,Shanxi 710048,China;School of Highway,Chang’an University,Xi’an,Shanxi 710064,China;Glodon Company Limited,Beijing 100193,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043 [2]西安理工大学土木建筑工程学院,陕西西安710048 [3]长安大学公路学院,陕西西安710064 [4]广联达科技股份有限公司,北京100193

出　　处：《河北工程大学学报（自然科学版）》2023年第1期55-65,共11页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(52078421);陕西省“特支计划”青年拔尖人才(陕组通字〔2018〕33号);中铁一院科研项目(院科19-75-01)。

摘　　要：为研究地铁盾构隧道下穿高铁路基时的变形规律及其影响因素,以西安市实际工程为背景,建立三维数值模型,分析地铁盾构隧道下穿既有高铁路基时高铁路基位移、道床位移等因素的变化规律。同时,利用正交试验研究隧道开挖间距、隧道下穿角度等因素对高铁路基的影响。结果表明:盾构隧道施工完成后,路基和道床的最大竖向位移分别为9.18、7.43 mm;路基土体横向最大位移不同方向分别为0.24、-0.29 mm;道床最大位移不同方向分别为0.17、-0.13 mm。此外,竖向净距对既有高铁路基与高铁路基道床竖向变形影响最大;下穿角度对既有高铁路基道床横向变形影响最大。In order to study the deformation law and its influencing factors when the shield tunnel underpasses the high railway foundation,a three-dimensional numerical model is established based on the actual project in Xi'an city,and the variation laws of the displacement of the high railway foundation and the displacement of the track bed when the shield tunnel underpasses the existing high railway foundation are analyzed.At the same time,orthogonal experiments are used to study the influences of tunnel excavation distance,tunnel underpass angle and other factors on the high railway foundation.The results show that the maximum vertical displacements of roadbed and roadbed after shield tunnel construction are 9.18 mm and 7.43 mm,respectively.The maximum lateral displacements of subgrade soil in different directions are 0.24 mm and -0.29 mm,respectively.The maximum displacements of the track bed in different directions are 0.17 mm and -0.13 mm,respectively.In addition,the vertical clear distance has the greatest effect on the vertical deformations of the existing high railway foundation and the high railway foundation bed.The underpass angle has the greatest influence on the transverse deformation of the existing high railway foundation bed.

关 键 词：盾构隧道 高铁路基 CFG桩复合地基 数值模拟 正交试验 

分 类 号：U451[建筑科学—桥梁与隧道工程]