高速列车作用下新型路涵过渡段动力特性研究  

Research on Dynamic Characteristics of New Type Culvert-Subgrade Transition Section Under High Speed Train Running

作　　者：王先斌[1] 童心豪 冯汉卿[3] 杨小虎[3] WANG Xianbin;TONG Xinhao;FENG Hanqing;YANG Xiaohu(State Nuclear Electric Power Planning Design&Researcch Institute,Beijing 100095,China;Southwest Jiaotong University,Chengdu Sichuan 610031,China;Taiyuan Railway Administration,Taiyuan Shanxi 030013,China)

机构地区：[1]国核电力规划设计研究院,北京100095 [2]西南交通大学,四川成都610031 [3]太原铁路局,山西太原030013

出　　处：《铁道建筑》2018年第4期110-112,116,共4页Railway Engineering

基　　金：四川省科技计划(2016GZ0338)

摘　　要：针对某一典型高速铁路路涵过渡段进行室内试验及数值模拟,建立车辆-轨道-过渡段动力大耦合模型,提出了新型过渡段的组成以及变态浆液、改良级配碎石的关键配比参数。结果表明:随着深度的增加路基动应力、加速度逐渐减小,并呈现指数分布;随着深度的增加,竖向位移变化曲线较为平缓;随着列车运行速度的增加,路基应力、位移、加速度总体上逐渐增大,存在速度150,350 km/h^2个临界速度,说明列车运行速度与过渡段的动力响应并非呈正比例关系;随着列车轴重的增加路基加速度、动应力变化不大,竖向位移变化较为明显,位移随列车轴重的增大而增大,这说明重载铁路对过渡段的要求很高。Indoor tests and numerical simulation were made according to one typical culvert-subgrade transition section in the high speed railway,the vehicle-track-transition section dynamic large coupling model was established,and the composition of new type transition section and key matching parameters of metamorphic grout and modif ied graded crushed stone were put forward.The results show that the dynamic stress and acceleration of subgrade gradually decreases and shows exponential distribution with the increase of depth,the vertical displacement curve is gentler with the increase of depth,the stress,displacement and acceleration of subgrade increases as a whole and there is a critical speed of 150,350 km/h 2 with the increase of train speed,which shows that the speed of train is not proportional to the dynamic response of transition section,the acceleration and dynamic stress of subgrade changes little with the increase of train axle load,the vertical displacement changes more obvious and increases with the increase of train axle load,which indicates that heavy load railway subgrade has a high demand for the transition section.

关 键 词：高速铁路 过渡段 试验研究 数值计算 动力响应 加速度 位移 

分 类 号：U213.13[交通运输工程—道路与铁道工程]