结果表明，修筑高路基后，多年冻土上限有所抬升，而下伏土层地温明显升高。
Results indicated that permafrost table was raised, the underlying ground temperature increased after constructing embankment.
多年冻土区修筑沥青路面后，引起了路基下多年冻土上限、多年冻土热状态等变化。
After asphalt pavement having been constructed in permafrost regions, permafrost thermal regime and permafrost table under roadbed will undergo a change.
准确确定多年冻土上限的位置及掌握其变化规律是冻土地区工程勘察的基本工作和重要内容。
It is important work to confirm the position of natural permafrost table and grasp its change law. Introducing the exploring method of natural permafrost table in Qingzang railway.
多年冻土上限的抬升主要是由于高路基的热阻效应导致上限附近土层温度变幅急剧减小而形成的。
The rising of permafrost table should be attributed to an obvious decrease in fluctuation of temperature at the depth of permafrost table due to the thermal resistance effect of high embankment.
多年冻土上限的抬升主要是由于高路基的热阻效应导致上限附近土层温度变幅急剧减小而形成的。
The rising of permafrost table should be attributed to an obvious decrease in fluctuation of temperature at the depth of permafrost table due to the thermal resistance effect of high emba…
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
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