为掌握大西客运专线寒冷地区路基冻胀变形规律,选择4个代表性监测段落,在一个冻融期内对路基中地温、冻胀变形及含水量进行观测,测试结果表明：地温发展变化大致经历快速降温、慢速降温、升温3个阶段,部分段落的最大冻结深度测试值大于设计值；路基表层处体积含水量上下波动相对较大,路基深层处体积含水量有缓慢减小的趋势；路基冻胀变形均小于8mm,冻胀发生的部位主要集中在基床表层范围。%Four representative monitoring sections are selected in the freezing and thawing period to learn the rules of subgrade frost heaving deformation on Datong-Xi’an passenger dedicated line in cold region by means of the observation of ground temperature, subgrade frost heave deformation and water content. The results show that the development and change of ground temperature occur in three stages: rapid cooling, slow cooling and temperature rise; the measured maximum freezing depths are greater than the design values on some sections; the fluctuation of volumetric water content in the subgrade surface is relatively greater, while the volumetric water content in deep subgrade tends to reduce slowly; the subgrade frost heave deformation is less than 8 mm, and the frost heaving concentrates in the subgrade surface.
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