摘要
通过对高铁无砟轨道的钢轨上拱问题进行数值模拟,研究3种工况(基床底层、泥岩地基、基床底层+泥岩地基)不同膨胀率变形情况下,钢轨产生的上拱位移以及膨胀应力响应规律。研究结果表明:对应3种工况下膨胀率为0.15%,0.06%和0.04%时的钢轨上拱量接近高铁轨道可调节的临界值,并发现由路基结构膨胀引起的钢轨上拱病害的空间分布仅与路基结构层发生的膨胀范围有关,而与膨胀变形的程度与发生膨胀变形的结构层位无关。进一步分析发现,由于钢轨与轨道板之间的牢固连接,在路基膨胀段与非膨胀段的共同作用下钢轨上拱拱顶与拱脚处分别表现为全截面受拉与全截面受压的应力状态,同时3种工况下当膨胀率小于0.5%时,各结构层的膨胀率与钢轨的上拱位移以及轴向主拉应力均呈现良好的线性关系。
In this paper, the numerical simulation of the rail arching problem of the ballastless track of high-speed railway was carried out, and the three types of working conditions(i.e., base bed bottom, mud rock foundation, bed bottom layer and mudstone foundation) were studied under different deformation conditions with varying expansion ratios. The responses of the arch displacement and the expansion stress(including the lifting force and the axial stress of the rail) were calculated. The results show that under the three working conditions, when the expansion rates are 0.15%, 0.06%, 0.04%, the up arch approaches the critical value of high-speed rails, and it was found the range of the up arch which caused by the expansion of the subgrade structure is only related to the range of expansion of the subgrade structural layer, but not to the degree of expansion deformation or the position of the structural layer where expansion deformation. Further analysis found that due to the strong connection between the rail and the track plate, under the joint action of the subgrade expansion section and the non-expansion section, the arch crown and the arch foot of the rail respectively show the stress state of the full-section tension and full-section compression. At the same time, when the expansion ratio is less than 0.5% under three working conditions, the expansion ratio of each structural layer has a good linear relationship with the upper arch displacement and the axial main tensile stress of the rail.
作者
王瑞
程建军
李中国
王梦田
马义龙
WANG Rui;CHENG Jianjun;LI Zhongguo;WANG Mengtian;MA Yilong(College of Water and Architectural Engineering,Shihezi University,Shihezi 832003,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第12期2942-2950,共9页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51641808)
兵团中青年科技创新领军人才计划项目(2019CB023)
关键词
高速铁路
路基膨胀
轨道上拱
数值模拟
high-speed railway
subgrade expansion
upper arch
numerical analysis
