高速铁路弹塑性路基及轨道的地震反应特性研究  

Research on seismic response characteristics of high-speed railway elastoplastic subgrade and track

作　　者：王滢 张粮 高盟[1] 徐晓[1] 陈青生 高广运[3] WANG Ying;ZHANG Liang;GAO Meng;XU Xiao;CHEN Qingsheng;GAO Guangyun(Shandong University of Science and Technology, Shandong Province Key Laboratory of Civil Engineering & Disaster Prevention and Mitigation, Qingdao 266590, China;East China Jiaotong University, Jiangxi Provincial Key Laboratory of Geotechnical Engineering Infrastructure Safety and Control, Nanchang 330013, China;Department of Underground Architecture and Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌330013 [3]同济大学地下建筑与工程系,上海200092

出　　处：《地震工程与工程振动》2021年第5期225-237,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(41772288);山东省自然科学基金项目(ZR201702160391)。

摘　　要：高铁列车运行时突发地震会对路基及轨道产生振动危害,严重影响列车的安全运行。为此,文中建立轨道系统-弹塑性路基-地基三维精细化有限元模型,分析高速铁路弹塑性路基和轨道在不同列车速度v(50、70、100、130 m·s^(-1))下的地震反应特性,结果表明:地震与列车共同作用下,路基和轨道的位移振幅主要受地震作用影响,而车速变化对路基位移幅值的作用较弱,对轨道的作用较强;地震发生时,列车以不同车速运行会对路基和轨道的频谱曲线产生不同程度的波动影响,其中在车速50 m·s^(-1)时波动最为剧烈,且总体向高频移动,并出现多个振动主频,此时路基和轨道的加速度峰值分别为单独移动荷载的2.3和1.3倍,路基及轨道加速度显著提高;地震作用下,列车的脱轨系数与横向位移在车速50 m·s^(-1)时显著增大,超过列车安全运行的标准;推测车速50 m·s^(-1)(180 km·h^(-1))为列车脱轨的临界速度。The sudden earthquake of high-speed train will bring vibration hazard to subgrade and track,and affect the safety of train operation seriously.For this reason,a three-dimensional fine finite element model of track system-elastoplastic roadbed-foundation is established to analyze the seismic response characteristics of high-speed railway elastoplastic roadbed and track under different train speeds(50、70、100、130 m·s^(-1)).The results show:Under the combined action of the earthquake and the train,the displacement amplitude of the roadbed and track is mainly affected by the earthquake,while the speed change has a weaker effect on the displacement amplitude of the roadbed and a stronger effect on the track.When the earthquake occurs,trains running at different speeds will have varying degrees of fluctuations in the spectrum curve of the roadbed and track.Among them,the fluctuation is the most severe when the speed is 50 m·s^(-1),and the overall movement is high-frequency,and there are multiple vibrations.At this time,the acceleration peaks of the roadbed and track are 2.3 and 1.3 times of the individual moving load respectively,and the acceleration of the roadbed and track is significantly improved.Under the action of earthquake,the derailment coefficient and lateral displacement of the train increase significantly when the speed is 50 m·s^(-1),which exceeds the standard of safe operation of the train.It is estimated that the vehicle speed of 50 m·s^(-1)(180 km·h^(-1))is the critical speed for train derailment.

关 键 词：高速铁路 地震和移动荷载共同作用 弹塑性路基 地震反应 脱轨系数 临界速度 

分 类 号：TU435[建筑科学—岩土工程]