【摘要】 室内试验和现场监测数据表明,粗颗粒土的冻胀敏感性与土的级配、初始含水量、温度、外载等诸多因素有关;在一定的组合条件下,粗颗粒土也可以发生显著的冻胀.以认识哈大高铁路基冻胀特性为目的,在分类梳理有关粗颗粒土冻胀特性研究文献的基础上,简要论述了粗颗粒土的冻胀理论及其发展现状,然后重点论述了有关影响粗颗粒土冻胀特性的几个关键因素——细颗粒含量、水分特征及温度状况方面的研究成果和存在的问题.最后,讨论了研究粗颗粒土冻胀模型及其冻胀机理时应关注的问题,以更好地评价、防治公路和铁路路基土冻胀.更多还原

【Abstract】 Both field and laboratory tests showed that frost heaving susceptibility of coarse grained soil were related to many factors, such as soil gradation, initial moisture content, temperature and external loads.Apparent frost heaving had been observed in coarse grained soil under certain composition conditions. In an attempt to explain the subgrade frost heaving properties of Harbin-Dalian high-speed railway,based on some documents on frost heaving properties of coarse grained soil,in this paper,first,frost heaving theory of coarse grained soil is disserted and reviewed,then research findings and problems about fines,water,and temperature,which influence frost heaving properties of coarse grained soil seriously,are presented. At last,several issues on frost heaving theory and model are proposed,which should be paid more attention to,in order to evaluate and prevent frost heaving of highway and railway better.更多还原