高速铁路箱式路基新型结构研究  

Study on new structure of high-speed railway box-type subgrade

作　　者：肖宏[1,2] 陈盈盈[1,2] 宋绪国 郭帅杰 魏绍磊 XIAO Hong;CHEN Yingying;SONG Xuguo;GUO Shuaijie;WEI Shaolei(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Key Lab of Track Engineering,Beijing Jiaotong University,Beijing 100044,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学轨道工程北京市重点实验室,北京100044 [3]中国铁路设计集团有限公司,天津300308

出　　处：《中南大学学报(自然科学版)》2025年第2期781-793,共13页Journal of Central South University:Science and Technology

基　　金：城市轨道交通数字化建设与测评技术国家工程研究中心开放课题基金资助项目(2023JS01);中央高校基本科研业务费专项资金资助项目(2022JBXT010)。

摘　　要：主要阐述箱式路基的结构特点、荷载分类及组合,并建立车辆-轨道-箱式路基-复合地基空间力学模型对其工作特性和荷载传递开展系统研究。研究结果表明:箱式路基纵向长度应≤17.24m,底部设计厚度应≥500mm;在温度作用下无明显伸缩位移,但在结构端缝处存在钢轨应力峰;结构不存在共振风险;在350km/h速度下,箱式路基动应力、动位移均远比限值要求小;但顶板加速度会达到3.325m/s^(2),比我国传统简支梁桥振动加速度大,但比规范限值小;与传统土质路基对比,箱式路基对动荷载的吸收和耗散更具有优势,到路基垫层时,振动衰减超过90%,因此,对箱式路基底部复合地基进行设计时可不考虑列车动荷载的影响。The structural characteristics of the box-type subgrade,the classification and combination of loads were elaborated in this paper.A spatial mechanical model of the vehicle-track-box subgrade-composite foundation was established to systematically study its working characteristics and load transfer mechanisms.The results show that the longitudinal length of the box-type subgrade should not exceed 17.24 m,and the bottom design thickness should be no less than 500 mm.Under temperature effects,no significant expansion or contraction displacements are observed,but stress peaks are detected in the steel rails at structural end joints.The risk of resonance is ruled out by modal analysis.Under the action of a 350 km/h speed,the dynamic stress and displacement of the box-type subgrade are found to be significantly below the limit requirements.However,the acceleration on the top slab is measured at 3.325 m/s^(2),which is higher than the vibration acceleration values of traditional simply supported beam bridges in China but remains within the specification limits.Compared to traditional soil subgrades,the box type subgrade is shown to demonstrate superior performance in absorbing and dissipating dynamic loads,with vibrations being attenuated by over 90%by the time they reach the subgrade cushion layer.Therefore,the impact of train dynamic loads can be disregarded in the design of the composite foundation at the bottom of the box-type subgrade.

关 键 词：高速铁路 新型结构 箱式路基 结构设计 有限元分析 荷载传递 

分 类 号：U213.1[交通运输工程—道路与铁道工程]