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介绍青藏铁路安多段冻土路基稳定性监测工程的监测方案、技术关键,通过对2个冻融周期内冻土融化深度、地温变化规律、冻土多年上限、冻胀板变形的分析,发现多年冻土上限上移,地温波动滞后于气温波动,上限附近地温基本不变且呈负温,有利于多年冻土的保护,说明抛片石路基起到了积极作用,为评价高原、高寒、冻土地区路基稳定性提供可靠依据;对青藏铁路的运营、维护具有重要的现实意义。
This paper introduces the monitoring scheme and technical key of the stability monitoring project of Antudian permafrost on the Qinghai-Tibet Railway. Based on the analysis of the thawing depth, the change law of the ground temperature, the multi-year limit of the frozen soil and the deformation of the frost heave plate during the two freeze-thaw cycles, The upper limit of permafrost moved upwards, the fluctuation of ground temperature lagged behind the fluctuation of temperature. The ground temperature near the upper limit was basically the same and negative temperature, which was beneficial to the protection of permafrost. It showed that the paving stone embankment played an active role in evaluating the plateau, alpine and permafrost regions The stability of the subgrade provides a reliable basis; it has important practical significance for the operation and maintenance of the Qinghai-Tibet Railway.