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- 저자 : Shuangyang Li (검색결과 2 건)
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Experimental Study on the Electro-osmotic Treatment of Frost Boiling Damage of Cold-Region Subgrade
Deren Liu,Jiale Yang,Shuangyang Li,Xu Wang,Shuochang Xu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.4
In cold regions, the pore water of subgrade surface soil rises sharply because ice lenses thaw in spring-thawing seasons and cannot drain out in a short time, which leads to a high water content in the thawed layer of the cold-region subgrade. Frost boiling damage of subgrade occurs frequently under repeated traffic loads and seriously affects the normal operation of the road. Based on the advantages of rapid and effective electro-osmotic drainage, a horizontal stage electro-osmotic drainage method (HSEDM) was designed to treat the frost boiling damage of cold-region subgrade. To test the engineering effectiveness of the HSEDM, a model test was carried out, in which many key indexes, such as the current intensity, effective potential, electrode corrosion, water content, shear strength and surface settlement, were closely monitored. Through the controlled trial, it indicates that the pore water was mainly driven to move from the anode to the cathode and further drained out from the slope by electric field force. At the same time, the shear strength of the frost boiling subgrade increases significantly after electro-osmotic consolidation. The experimental results provide a theoretical basis for the engineering application of the HSEDM in the treatment of frost boiling damage of cold-region subgrade.
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Experimental Study and Statistical Theory of Creep Behavior of Warm Frozen Silt
Mengke Liao,Yuan-Ming Lai,Junjie Yang,Shuangyang Li 대한토목학회 2016 KSCE Journal of Civil Engineering Vol.20 No.6
To investigate the soil parameters and stochastic mechanical characteristics of warm frozen silt, a series of triaxial compression tests were conducted on frozen silt at the temperature of -1.5°C under confining pressures of 0.5, 1.0, and 2.0 MPa. The results indicate that the creep properties of warm frozen silt are affected considerably by stress levels. The creep show present primary and secondary creep stages under low stress level and indicate that the specimen is destroyed quickly under high stress levels. Based on phenomenological theory, a unified creep constitutive model of warm frozen silt was proposed. The results predicted by the proposed model agree well with corresponding experimental data. Investigation of the random distribution has revealed that the parameters of the proposed creep model could be better described by a normal distribution. Based on the dynamic theory of frozen soil strength, the long-term strength of warm frozen silt was obtained, and was found to exhibit nonlinear behavior with increasing confining pressure. The Weibull function can represent the random distribution well, and the reliabilities of long-term strength were given under different confining pressures.
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