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结合片石气冷加碎石护坡组合路基、片石气冷路基、碎石护坡路基、热棒路基及普通素土路基等结构形式地温和变形的现场监测数据,对青藏铁路多年冻土区路基人为上限的变化规律、形态特点和类型进行分析。结果表明,青藏铁路多年冻土区路基的人为上限形态类型为人为上限升入路基本体的A型和人为上限升入基底土层中的B型,且路基人为上限的变化已基本趋于稳定;随着时间的推移,路基的沉降也逐渐趋稳;路基累计沉降量与路基高度成正比而与人为上限的上升值成反比。
Combining the on-site monitoring data of the geothermal deformation of the lithofacies-air-cooled and crushed-stone slope-protecting combined subgrade, the lithofacies air-cooled subgrade, the gravel slope protection subgrade, the hot rod subgrade and the common plain soil subgrade and so on, The change rule, the form characteristic and the type carries on the analysis. The results show that the type of man - made upper limit of the permafrost embankment in the Qinghai - Tibet Railway is type A with man - made upper limit rising into road base and type B with man - made upper limit reaching basement soil. The change of man - made upper limit of subgrade has basically stabilized. With the passage of time, the settlement of subgrade gradually stabilized; the cumulative settlement of subgrade is proportional to the subgrade height and inversely proportional to the rising value of artificial ceiling.