高铁动荷载对近接综合交通枢纽换乘中心施工的影响  

Influence of High-speed Rail Dynamic Load on Construction of Transfer Center Close to Comprehensive Transportation Hub

作　　者：王朝晖 高林静 贾连志 姜华 梁斌 WANG Zhaohui;GAO Linjing;JIA Lianzhi;JIANG Hua;LIANG Bin(China Railway Construction Corporation Limited,Beijing 100855,China;Civil Engineering School,Henan University of Science&Technology,Luoyang 471000,China;Luoyang Rail Transit Group Co.,Ltd.,Luoyang 471000,China;China Railway 19th Bureau Group Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中国铁建股份有限公司,北京100855 [2]河南科技大学土木工程学院,河南洛阳471023 [3]洛阳市轨道交通集团有限责任公司,河南洛阳471000 [4]中铁十九局集团有限公司,北京100176

出　　处：《河南科技大学学报（自然科学版）》2022年第4期76-85,M0007,共11页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(U1604135);中铁十一局集团有限公司重点科研课题(18-AⅡ-02);中铁十五局集团有限公司重点科研课题(2019C51);中铁十九局集团有限公司重点科研课题(19-A04)。

摘　　要：为研究高速列车动荷载作用下基坑变形规律与稳定性,以洛阳龙门站综合交通枢纽—换乘中心基坑工程为依托,采用激振力函数模拟计算高速列车动荷载。运用Midas-GTS/NX有限元软件并结合现场监测数据对高速列车动荷载的不同作用形式、不同车速以及不同轴质量作用下换乘中心基坑的锚索轴力、桩体位移、桩后地表沉降等展开研究。研究结果表明:列车动荷载和静荷载作用下的桩体位移比不考虑荷载作用时各增大24.56%和22.66%,最大地表沉降相应增大2.42 mm和2.07 mm。不同车速下桩体位移和地表沉降最大增幅各为23.36%和31.47%。高速列车轴质量相较于车速对桩锚支护结构稳定性和地表沉降影响更加显著,与不同车速相比,各道锚索轴力最大值增大了1.23倍、1.21倍和1.16倍,最大桩体位移和地表沉降相应增大1.17倍和1.19倍。对基坑进行稳定性验算,安全系数相应达到1.48、2.12和5.13,均满足规范要求。In order to study the deformation law and stability of the foundation pit under the dynamic load of the high-speed train,based on the Luoyang Longmen station comprehensive transportation Hub-Transfer center foundation pit project,the excitation force function was used to simulate and calculate the dynamic load of the high-speed train.Midas-GTS/NX finite element software combined with field monitoring data was used to study the anchor cable axial force,pile position movement and surface settlement behind pile of transfer center foundation pit,under different action forms of high-speed train dynamic load,different vehicle speeds and different axle loads.The results show that the displacement of the pile under the dynamic load and static load of the train is increased by 24.56%and 22.66%respectively than the load not considering,and the maximum surface settlement increases by 2.42 mm and 2.07 mm respectively.The maximum increaseing in pile displacement and surface settlement under different vehicle speeds are 23.36%and 31.47%respectively.The axle load of high-speed train has a more significant effect on the stability of pile-anchor support structure and surface settlement than the speed.Compared with different vehicle speeds,the maximum axial force of each cable increases by 1.23 times,1.21 times and 1.16 times,and the maximum pile displacement and surface settlement increase by 1.17 times and 1.19 times respectively.The stability of the foundation pit was checked,and the safety factors reached 1.48,2.12 and 5.13,which meet the requirements of the specification.

关 键 词：高速列车动荷载 换乘中心基坑 桩锚支护 动力响应分析 稳定性验算 

分 类 号：TU470[建筑科学—结构工程]