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近年来,我国在多年冻土区正在修建大量高速公路,高速公路具有行车速度快、通行能力大、物资周转快和经济效益好等特点,但同时也对其路基的冻胀变形控制提出更高的要求。而路基土体温度的变化是影响路基冻胀变形的主要因素。因此,论文结合国内修筑在多年冻土区的G214线为实例,选择3种不同型式的路基结构,进行现场地温监测。通过对实测数据分析,总结出了不同路基结构型式的地温变化规律,为今后多年冻土区构筑物的设计与施工提供充足的技术支持。此外,通过对比3种路基结构的地温变化特征,得出了防止路基冻胀变形的合理路基结构型式。
In recent years, a large number of expressways are being constructed in the permafrost regions in our country. The expressways have the characteristics of fast driving speed, large traffic capacity, quick turnover of goods and good economic benefits, but also put forward higher control of frost heave deformation of subgrade Request. The change of subgrade soil temperature is the main factor that affects the subgrade frost heave deformation. Therefore, combining the G214 line built in the permafrost region in China as an example, the paper chooses three different types of subgrade structures to monitor the ground temperature. Through the analysis of the measured data, the change law of the ground temperature of different subgrade structures is summarized, which provides sufficient technical support for the design and construction of the structures in the permafrost. In addition, by comparing the characteristics of the ground temperature changes of the three subgrade structures, a reasonable subgrade structure type for preventing the frost heave deformation of the subgrade is obtained.