下穿既有引桥地铁连拱通道施工方案优选  

Construction Scheme Optimization of Subway Double-arch Channel When Undercrossing Existing Bridge

作　　者：衡明欣 徐红玉 何小利 HENG Mingxin;XU Hongyu;HE Xiaoli(Civil Engineering School,Henan University of Science & Technology,Luoyang 471023,China;The Fifth Engineering Company,China Railway 15th Bureau Group,Tianjin 300000,China)

机构地区：[1]河南科技大学土木工程学院,河南洛阳471023 [2]中铁十五局集团第五工程有限公司,天津300000

出　　处：《河南科技大学学报（自然科学版）》2019年第6期50-56,63,M0005,共9页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(U1604135);河南省科技厅产学研合作基金项目(2015HNCXY011)

摘　　要：依托北京地铁14号线十里河站与10号线十里河站3条暗挖换乘通道下穿十里河桥引桥工程,研究了地铁连拱换乘通道下穿引桥施工方案的优选问题。采用有限元软件MIDAS-GTS NX建立连拱换乘通道的三维实体模型,分别模拟分析了中隔壁法、三导洞法和中导洞法3种施工方案对地表沉降、围岩变形、支护结构受力及引桥的影响。研究结果表明:3种开挖施工方案均满足施工要求,中导洞法的地表沉降最大值为4.17mm,拱顶沉降最大值为3.53 mm,该方法的各类沉降最大值均为3种方案中最小值,因此中导洞法为最优施工方案。对比数值模拟结果和工程实际监测数据,验证了数值仿真的合理性。The optimization of the construction scheme of the underpass bridge of the subway double-arch transfer channel was studied,based on the three underground excavation and transfer channels of Shilihe Station of Beijing Metro Line No.14 and Shilihe Station of Line 10.A three-dimensional solid model of the arch-transfer channel was established by using MIDAS-GTS NX software.The effect of three different construction schemes of the middle partition wall method,the three-way hole method and the middle guide hole method on the surface settlement,surrounding rock deformation,supporting structure force and approach bridge were simulated and analyzed respectively.The research results show that all three excavation construction schemes meet the construction requirements.The surface settlement maximum of the middle guide hole method is 4.17 mm.The vault crown settlement maximum is 3.53 mm.Each kind of maximum settlement of the middle guide hole method is the minimum value of the three schemes.The middle guide hole method is preferred.The rationality of numerical simulation is verified by comparing the numerical simulation results with the actual monitoring data of the project.

关 键 词：地铁连拱通道 下穿引桥 数值模拟 施工方案优选 

分 类 号：U455[建筑科学—桥梁与隧道工程]