摘要
采用有限元软件建立不同类型无砟轨道-传统路基结构/沥青混凝土面路基结构体系仿真分析模型,通过京沈高速铁路现场实测数据对模型进行验证,对比分析了沥青混凝土层对无砟轨道-路基结构体系荷载传递规律的影响。结果表明:与传统路基结构对比,沥青混凝土面路基结构受力更优,且均具有较好的适应性;增设沥青混凝土层后,路基内荷载扩展范围增大了0.1~0.3 m,底座板边缘位置应力衰减速率增大一倍,沥青混凝土层具有良好的应力扩散作用;沥青混凝土层有利于改善路基结构受力,且不同类型无砟轨道中改善深度为1.2~2.3 m;无砟轨道-路基结构体系竖向应力随深度增加呈指数型减小,各结构层均存在应力突变现象,应注意疲劳损伤问题。
Finite element software was used to establish simulation analysis models of different types of ballastless track-traditional subgrade structure/asphalt concrete pavement subgrade structure system.The model was verified by the field measured data of Beijing-Shenyang high-speed railway,and the influence of asphalt concrete layer on the load transfer law of ballastless track-subgrade structure system was comparatively analyzed.The results show that compared with traditional subgrade structures,asphalt concrete surface subgrade structures have better stress and better adaptability.After adding the asphalt concrete layer,the load expansion range in the subgrade is increased by 0.1~0.3 m,the stress attenuation rate at the edge of the base plate is doubled,and the asphalt concrete layer has a good stress diffusion effect.The asphalt concrete layer is conducive to improving the stress of subgrade structure,and the improvement depth in different types of ballastless track is 1.2~2.3 m.The vertical stress of ballastless track-subgrade structure system decreases exponentially with the increase of depth,and the stress abrupt phenomenon exists in each structure layer.Attention should be paid to fatigue damage.
作者
姚明昕
肖宏
石越峰
楼梁伟
吕宋
YAO Mingxin;XIAO Hong;SHI Yuefeng;LOU Liangwei;LYV Song(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Tieke Special Engineering Technology Co.Ltd.,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2023年第7期122-128,共7页
Railway Engineering
基金
国家自然科学基金(41972299,41731288)
中国国家铁路集团有限公司科技研究开发计划(K2020G032)
山东铁投集团科技计划(TTKJ2021-07)。
关键词
高速铁路路基
无砟轨道
沥青混凝土层
有限元分析
荷载传递
竖向应力
应力扩散角
high speed railway subgrade
ballastless track
asphalt concrete layer
finite element analysis
load transfer
vertical stress
stress diffusion angle
