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Long-term plate load tests in permafrost region on the Qinghai-Tibetan Plateau
AbstractIn order to study the deformation behavior of in-situ warm and ice-rich permafrost with seasonally varying ground temperature, two groups of plate load tests were carried out in permafrost region on the Qinghai-Tibetan Plateau. The test results showed that the deformation of the permafrost under a constant load always represented a stepped pattern due to seasonal variation of ground temperature. Affected by the external load and the variation of the ground temperature, both settlement and frost heave occurred. In the long term, however, settlement was the primary characteristic while frost heave was much slight. The settlement rate was positively correlated with load levels, and was greatly affected by soil temperature as well as ice content in the ground. Regardless of frost heave, the deformation curves of permafrost were well expressed by Burgers viscoelasticity model, and the future settlements can be predicted based on the model.
HighlightsLong-term plate load tests were carried out in permafrost region on the Qinghai-Tibetan Plateau.A step-form deformation developed for permafrost under a load caused by seasonal variation of ground temperature.Even for the permafrost keeping in a frozen state, frost heave still presented in the deformation development.Burgers viscoelasticity model is favorable to express the deformation curve of permafrost regardless of frost heave.
Long-term plate load tests in permafrost region on the Qinghai-Tibetan Plateau
AbstractIn order to study the deformation behavior of in-situ warm and ice-rich permafrost with seasonally varying ground temperature, two groups of plate load tests were carried out in permafrost region on the Qinghai-Tibetan Plateau. The test results showed that the deformation of the permafrost under a constant load always represented a stepped pattern due to seasonal variation of ground temperature. Affected by the external load and the variation of the ground temperature, both settlement and frost heave occurred. In the long term, however, settlement was the primary characteristic while frost heave was much slight. The settlement rate was positively correlated with load levels, and was greatly affected by soil temperature as well as ice content in the ground. Regardless of frost heave, the deformation curves of permafrost were well expressed by Burgers viscoelasticity model, and the future settlements can be predicted based on the model.
HighlightsLong-term plate load tests were carried out in permafrost region on the Qinghai-Tibetan Plateau.A step-form deformation developed for permafrost under a load caused by seasonal variation of ground temperature.Even for the permafrost keeping in a frozen state, frost heave still presented in the deformation development.Burgers viscoelasticity model is favorable to express the deformation curve of permafrost regardless of frost heave.
Long-term plate load tests in permafrost region on the Qinghai-Tibetan Plateau
Zhang, Hu (author) / Zhang, Jianming (author) / Zhang, Keqiang (author) / Zheng, Bo (author)
Cold Regions, Science and Technology ; 143 ; 105-111
2017-08-31
7 pages
Article (Journal)
Electronic Resource
English
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