高速列车振动荷载作用下桥隧交叠结构动力响应特性研究  

Dynamic Response of Bridge-tunnel Structure Under Vibration Load of High-speed Train

作　　者：路啸 相旭[1] 徐硕 徐强 陈嘉琦 赵明建 李勇 LU Xiao;XIANG Xu;XU Shuo;XU Qiang;CHEN Jiaqi;ZHAO Mingjian;LI Yong(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Shijiazhuang Tiedao University Key Laboratory of Railway Engineering Safety Guaranty,Ministry of Education,Shijiazhuang 050043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]石家庄铁道大学土木工程学院,石家庄050043 [3]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,石家庄050043

出　　处：《铁道标准设计》2024年第7期162-170,共9页Railway Standard Design

基　　金：河北省重点研发计划项目(21375403D,20375410D);河北省自然科学基金面上项目(E2020210017);中铁第一勘察设计院集团有限公司科研项目(院科研19-55)。

摘　　要：为研究桥隧结构在高速列车振动荷载作用下的动力响应特性,通过数值模拟和模型试验相结合的方法,以频响函数和峰值加速度为评价指标分析单点振动荷载作用下桥隧结构动力响应规律。依托西安地铁14号线下穿大西高速铁路特大桥基础工程,采用有限元计算软件建立数值模型,研究高速列车移动荷载作用下桥隧交叠结构的动力响应特性。研究结果表明:全频域单点扫频振动荷载作用下,桥隧交叠结构的动力响应随着频率的增加而增大,隧道不同位置处的动力响应呈现明显差别,靠近桩基一侧拱腰的动力响应明显大于拱顶和拱底,平均差值分别为2.48 dB和4.15 dB。考虑列车振动荷载的移动效应会增大桥隧交叠结构的动力响应,移动荷载作用下拱顶处的峰值加速度增加约358%,靠近桩基一侧拱腰处增加约358%,远离桩基一侧拱腰处增加约280%,隧道拱底处增加约206%。此外研究发现,隧道结构动力响应均在距离桥隧交叠结构附近约10 m处开始迅速增强,超过10 m范围内动力响应变化趋于稳定,应加强靠近桥隧交叠结构10 m范围内的监控量测。In order to study the dynamic response characteristics of bridge and tunnel overlapping structure under the vibration load of high-speed trains,the dynamic response law of bridge and tunnel structures under the vibration load of a single point is analyzed by using frequency response function and peak acceleration as the evaluation index through the combination of numerical simulation and model test.Based on the foundation project of Datong-Xian High-speed Railway Bridge on Xian Metro Line 14,a numerical model is established by using finite element software to study the dynamic response characteristics of the bridge and tunnel overlapping structure under the moving load of high-speed trains.The result of research shows that:Under the full frequency domain single point sweep vibration load,the dynamic response of bridge and tunnel overlaps increases with the increase of frequency,and the dynamic responses at different positions of the tunnel are significantly different.The dynamic response of the arch near the pile foundation is significantly greater than that of the arch and the arch bottom with an average difference of 2.48 dB and 4.15 dB,respectively.Considering that the moving effect of train vibration load will increase the dynamic response of bridge and tunnel overlapping structure,the peak accelerations at the arch,near the pile foundation side and away from the pile foundation side increases about 358%,280%,and 206%respectively under moving load.In addition,the study founds that the dynamic response of the tunnel structure starts to increase rapidly at about 10 m away from the bridge and tunnel overlapping structure,and the dynamic response changes tend to be stable within 10 m,so the monitoring and measurement within 10 m near the bridge and tunnel overlapping structure should be strengthened.

关 键 词：高速列车 振动荷载 桥隧交叠结构 动力响应 模型试验 数值模拟 

分 类 号：U238[交通运输工程—道路与铁道工程] U231