铁道标准设计2017，Vol.61Issue(8)：32-36,5.DOI:10.13238/j.issn.1004-2954.2017.08.007
基于冻胀变形的基床表层疲劳寿命预测与分析
Prediction and Analysis of Fatigue Life of Surface Layer of Subgrade Based on Frost Deformation
摘要
Abstract
The construction of railway is faced with the problem of subgrade frost heaving in seasonally frozen ground. Cyclic freezing and thawing will exacerbate the destruction of subgrade structure and thus shorten the service life. According to the results of subgrade frost heave deformation, this paper presents a stress calculation model based on artificial deformation boundary and cites the formula for calculating the fatigue life of semi rigid base materials. On this basis, the service life of the surface layer of subgrade with different cement content is calculated. The results show that with the increase of wavelength of frost heave and the decrease of frost heaving amount, the maximum tensile bending stress of the surface layer of subgrade tends to increase. When the cement content is 0、1%、3% or 5%, the maximum tensile bending stress of the surface layer of subgrade caused by frost deformation is calculated as 31. 2、57. 6、69. 0 kPa and 75. 1 kPa respectively. With the increase of cement content, the service life of surface layer of subgrade increases. When the cement content is 1%、3% or 5%, the service life of surface layer of subgrade is increased by 27%、36% and 48% compared with those without cement addiction.关键词
季节冻土区/基床表层/冻胀变形/疲劳寿命Key words
Seasonally frozen soil regions/Surface layer of subgrade/Frost deformation/Fatigue life分类
交通工程引用本文复制引用
令行,肖宏,陈民子,陆永港..基于冻胀变形的基床表层疲劳寿命预测与分析[J].铁道标准设计,2017,61(8):32-36,5.基金项目
国家自然科学基金项目(51578055) （51578055）
中国铁路总公司科技研究开发计划课题(2014G003-F) （2014G003-F）
北京市科技专项(Z151100001615005) （Z151100001615005）
