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- 저자 : Xiaoliang Yao (검색결과 2 건)
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An Isotache Model for Frozen Soil Taking Account the Effect of Creep on Plastic Yield Pressure
Xiaoliang Yao,Jilin Qi,Xiangping Qiao,Mengxin Liu 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2
Plastic yield pressure is a key factor influencing mechanical behavior of frozen soil. In this paper, an isotache model taking account the effect of creep on plastic yield pressure was modified to describe the mechanical behavior of frozen soil. A series K0 compression tests after different creep time and at different temperature were carried out on a fine grained soil obtained from Qinghai-Tibet plateau. Based on analysis of the tested results, it was proved that the strain development of the tested frozen soil obeys the postulation of parallel lines in isotache model. Meanwhile, the development of plastic yield pressure with creep strain is inversely related to temperature, which can be reasonably described by exponential function deduced from the isotache model. The sharp strain increase of frozen soil can be captured by the isotache model when the surcharge loading exceeds the plastic yield pressure. After modifying the isotache model as temperature dependent, mechanical behavior of frozen soil at different temperature can be described reasonably, and the development of plastic yield pressure with creep strain and temperature can be calculated conveniently.
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Consolidation of Thawing Permafrost Considering Phase Change
Jilin Qi,Xiaoliang Yao,Fan Yu 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.6
When permafrost thaws, consolidation occurs under surcharge loads, leading to settlement which is one of the largest threats to infrastructures constructed in permafrost regions. This paper proposes a three dimensional thaw consolidation theory combining Biot’s consolidation theory with heat conductive equations considering ice-water phase change effects through specific heat. Numerical simulation was implemented. The theory was verified by comparing the degree of consolidation and pore pressure ratio calculated by this theory with that from closed form solutions for a simplified one dimensional problem. Thaw consolidation tests were carried out on frozen soil samples with four water contents and under two surcharge loads. Strains occurring in the tests were compared with those from the numerical calculations. It is found that with low water contents in the frozen soil, strain from thaw consolidation was relatively small, and was well simulated by the proposed theory. With increase in water content of frozen soils, the discrepancy between calculated and test results increases.
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