重载铁路改良土和A组填料过渡段的动力特性  

Dynamic features of transition section between improved soil and A-filled of heavy-haul railway

作　　者：商拥辉[1,2] 徐林荣[1,3] 刘维正[1] 蔡雨 SHANG Yong-hui;XU Lin-rong;LIU Wei-zheng;CAI Yu(School of Civil Engineering,Central South University,Changsha 410075,China;Institute of Architecture and Engineering,Huanghuai University,Zhumadian 463000,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]黄淮学院建筑工程学院,河南驻马店463000 [3]中南大学高速铁路建造技术国家工程实验室,长沙410075

出　　处：《吉林大学学报（工学版）》2021年第6期2128-2136,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51778634);中国博士后科学基金项目(2020M682589);河南省科技攻关重点研发项目(202102310264);河南省教育厅重点研发项目(20B58003)。

摘　　要：为分析不同类别填料相邻填筑特殊过渡段的动力特性,依托浩吉(浩勒报吉-吉安)重载铁路工程,采用现场激振试验与数值模拟相结合的方法,揭示了改良膨胀土和A组填料过渡段横、纵向路基的动力特性差异。结果表明:同荷载条件下,A组填料路基横断面动力响应大于改良膨胀土,具体表现为:动应力的增幅达到5%~8%,加速度的增幅达到40%~50%;当速度为120 km/h,轴重为25~30 t的重载列车运行时,过渡段交接处纵向路面动力响应存在0.8%~13%的加剧现象,且一定程度上受行车方向影响。本文研究成果可为重载铁路填料过渡段的精细化建设养修提供理论依据。In order to analyze the dynamic features of the special transition section of different types of filling adjacent to fill, considering the background of Haoji(Haole Baoji-Jian) heavy-haul railway engineering, the method, combining the field excitation test and numerical simulation, was used to reveal the difference of dynamic features between transverse and longitudinal of the transition section subgrade between improved soil and group A filler. The results show that under the same load condition, the dynamic response of the cross section of the A-filled subgrade is greater than that of the modified expansive soil, which is specifically manifested by the increase of dynamic stress by 5~8% and acceleration by 40~50%. When the trains with a speed of 120 km/h and an axle load of 25~30 t, the dynamic response of the longitudinal road surface at the junction of the transition section increases by 0.8~13%, and to certain extent it is affected by the direction of the vehicle. The research results can provide a theoretical basis for the fine construction and maintenance of the filling transition section of heavy-haul railway.

关 键 词：道路与铁道工程 填料过渡段 动力特性 激振试验 数值模拟 

分 类 号：U231.1[交通运输工程—道路与铁道工程]