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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.
Laboratory tests and on-site monitoring data show that the frost heave sensitivity of coarse-grained soil is related to the grading of soil, initial water content, temperature, external load and other factors. Under certain combination conditions, coarse-grained soil can also occur significantly Frost heave.Aiming at understanding the frost heaving characteristics of the Harbin-Dalian high-speed railway subgrade, based on a literature review on the frost heaving characteristics of the coarse-grained soil, the paper briefly discusses the frost heaving theory of coarse-grained soil and its development status, and then emphatically discusses Some key factors affecting the frost heave characteristics of coarse grained soil are the research results and existing problems in the aspects of fine particle content, water characteristics and temperature conditions.Finally, the research on the frost heave expansion model and the coarse grained soil model Should pay close attention to the problem, in order to better evaluate, prevent and control highway and subgrade frost heave.