摘要
基于量纲分析法,设计模型与原型比例为1:4的无砟轨道-路基变形相似模拟试验平台,采用中砂、细砂模拟路基材料,掺膨润土砂浆模拟无砟轨道混凝土材料。通过底部节段变形板的设置实现不同路基变形波长的模拟,通过竖向调整装置实现沉降、上拱等不同路基变形量的模拟。依据上述方法搭建的试验平台实测的变形曲线与仿真分析所得的计算曲线能够较好地重合。试验表明,波长较短时,沉降传递至上层时峰值衰减越明显,波长越长时,沉降峰值衰减越小。
A similarity simulation test platform for the deformation of ballastless track and subgrade with the model and prototype ratio of 1:4 is designed based on the dimensional analysis method. Medium sand and fine sand are used to simulate subgrade materials and mortar mixed with bentonite is used to simulate ballastless track concrete materials. The simulation of different subgrade deformation wavelengths is realized through the setting of the bottom segment deformation slab, and the simulation of different subgrade deformation such as settlement and camber is realized through the vertical adjustment device. The measured deformation curve of the test platform built by the above method can better coincide with the calculated curve of the simulation analysis. Results show that the shorter the wavelength is, the more obvious the peak attenuation is when the settlement is transferred to the upper layer, and the longer the wavelength is, the smaller the attenuation of the peak value is.
作者
赵如锋
赵国堂
杨斌
赵磊
ZHAO Rufeng;ZHAO Guotang;YANG Bin;ZHAO Lei(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China State Railway Group Co.,Ltd.,Beijing 100844,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第3期11-20,共10页
China Railway Science
基金
国家自然科学基金资助项目(51908552)
中国铁路总公司科技研究开发计划课题(P2018G003)。
关键词
无砟轨道
路基
模拟试验
相似模拟
量纲分析法
Ballastless track
Subgrade
Simulation test
Similarity simulation
Dimensional analysis