青海省共和－玉树高速公路沿线典型冻土路基保护多年冻土效果的初步分析

doi:10.13722/j.cnki.jrme.2015.0458

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Abstract Along the Gonghe—Yushu highway，three typical permafrost embankments，namely insulated board embankment，block-stone embankment and ventilated embankment were utilized. In order to study the process of variation of the underlying permafrost and to compare three measures，the temperature variations of the shallow layer(0–4 m) and deep layer(below 4 m) were analyzed. The chosen sections have a similar underlying permafrost conditions. The results showed that all three measures were confronted with the thermal asymmetry from the shady to sunny slope and the thermal asymmetry damaged the embankment stability. The deep temperature showed a continuous trend of increase. At the same depth，insulated embankment had the largest rate of increase，followed by the crushed-rock embankment，and the ventilated embankment had the smallest one. There was an uplift of artificial permafrost table for all three measures and still showing a continuous uplifting trend. The preliminary monitoring results showed that all three measures were effective in protecting permafrost from thawing. However，it has just been a short period since the construction of the highway，whether the measures are efficient to protect permafrost in the future is unknown，and further study is still ongoing.

Key words： soil mechanics Gonghe—Yushu highway the initial stage of the construction permafrost embankment

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0458 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I3/638

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