下穿高速公路斜交地道桥顶进施工分析  

Analysis on Jacking Construction of Skew Underpass Bridge Under Expressway

作　　者：谈军 杨涛 辛亚兵 姚威 TAN Ju;YANG Tao;XIN Yabing;YAO Wei(Gansu Provincial Transportation Research Institute Group Co Ltd,Lanzhou 730030,China;Hunan Construction Engineering and Transportation Construction Co Ltd,Changsha 410004,China)

机构地区：[1]甘肃省交通科学研究院集团有限公司,甘肃兰州730030 [2]湖南建工交通建设有限公司,湖南长沙410004

出　　处：《土木工程与管理学报》2023年第3期77-81,共5页Journal of Civil Engineering and Management

摘　　要：为保证浅覆土、大交角地道桥在下穿高速公路施工中的安全,以湖南平益高速公路平江南互通NK1+100.2地道桥为工程背景,采用有限元分析方法,将既有高速公路沉降数值分析结果与监测结果进行对比,在此基础上,计算了地道桥在不同覆土厚度、不同顶进阶段结构受力和变形。研究结果表明,路面沉降数值模拟结果与路面沉降实际监测值基本吻合,从而验证了数值模拟的正确性。随着地道桥顶进长度的增加,地道桥的最大应力值随之增大。既有高速公路路面沉降位移受覆土厚度的影响较大,随覆土厚度的增加,路面沉降呈现增大趋势,隆起呈变小趋势。In order to ensure the safety of shallow overburden and large intersection underpass bridge during the construction of underpass expressway,NK1+100.2 underpass bridge of Pingjiang south interchange of Pingyi Expressway in Hunan Province is taken as an engineering background.The finite element analysis method was used.Numerical analysis results of the existing expressway settlement were compared with the monitoring results.On this basis,the structural stress and deformation of underpass bridges in different overburden thickness and jacking stages are calculated.The results show that the numerical simulation results of pavement settlement are basically consistent with the actual monitoring values of pavement settlement.Thereby,the correctness of the numerical simulation is verified.The maximum stress value of the underpass bridge increases with the increasing jacking length of the underpass bridge.The settlement displacement of the pavement under the underpass bridge crossing the expressway is greatly affected by the thickness of the covering soil.With the increase of the thickness of the covering soil,the settlement of the pavement increases and the uplift decreases.

关 键 词：地道桥 大交角 数值分析 最大顶进力 

分 类 号：U415.6[交通运输工程—道路与铁道工程] U455.47[建筑科学—桥梁与隧道工程]