Monitoring and analysis of ground temperature and deformation within Qinghai-Tibet Highway subgradein permafrost region |
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| Authors: | YaHu Tian YuPeng Shen WenBing Yu and JianHong Fang |
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| Institution: | School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;Qinghai Research Institute of Transportation, Xining, Qinghai 810008, China;School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Qinghai Research Institute of Transportation, Xining, Qinghai 810008, China |
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| Abstract: | In order to study the stability of the Qinghai-Tibet Highway embankment at Chumaerhe in the permafrost region of northwest China, the ground temperature and deformation at different depths were monitored under the left and right shoulders of the embankment where thermosyphons were set up only on the left shoulder. Based on the monitored data, characteristics of ground temperature and deformation of the left and right shoulders are analyzed and discussed. The results show that the start time of freezing or thawing of the seasonal active layer was about one to two months later than that of the embankment body itself. The stability of each shoulder was mainly controlled by the settlement of different soil layers,whereasfrost heave of soil had scarcely any effect on the stability of the embankment. For the left shoulder, the settlement was mainly influenced by the seasonal active layer and then by the embankment body itself,due to freeze-thaw cycles which may change the soil properties; however, the permafrost layer remained fairly stable. For the right shoulder, creep of the warm permafrost layer was the main influence factor on its stability, followed by settlement of embankment body itself, and finally settlement of the seasonal active layer. Compared with the deformation of the left shoulder, the permafrost layer under the right shoulder was less stable, which indicates that the thermosyphons had a significantly positive effect on the stability of warm permafrost. |
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| Keywords: | Qinghai-Tibet Highway permafrost deformation ground temperature monitoring |
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