Study on the permeability coefficient model of salinized frozen soil based on unfrozen water content curve

Abstract

Due to the fact that the permeability coefficient of salinized frozen soil is difficult to measure through experimental test, this paper develops a model of the permeability coefficient of salinized frozen soil by using SFCC curves, which takes into account the effects of velocity slip on pore wall and seepage of unfrozen water film. This model is on the basis of capillary bundle model, and combines with phase diagram theory of water-salt binary system. For the silty clay from Qinghai-Tibet Plateau and silts from Onedia, the permeability coefficient fluctuation vs. temperature is calculated using the model. The estimated calculations of the permeability coefficient model were all found to be in good agreement with the experimental data by comparison. Additionally, the variation trend of permeability coefficient of NaCl, Na2SO4, and Na2CO3 type saline soils containing different salt contents is examined. The results indicate that before saline soils freeze, NaCl does not crystallize and thus has little impact on the permeability coefficient, whereas Na2SO4 and Na2CO3 both crystallize and block the pores, the permeability coefficient decreases with decreasing temperature. Once the saline soils have frozen, the freezing temperature has a larger impact on the permeability coefficient. During the early stage of freezing, the lower the freezing temperature is, the larger the permeability coefficient is. In the late stage of freezing, the permeability coefficients with various salt contents tended to be the same.

Thermal consolidation of layered saturated soil under time‐dependent loadings and heating considering interfacial flow contact resistance effect

“…Case 2: Jump flow contact model 24 $$$$\begin{equation}R_\omega ^{(J)}q_\omega ^{(J)}(x,t){|}_{x = \sum_{i = 1}^J {Hi} } = {p}^{(J)}(x,t){|}_{x = \sum_{i = 1}^J {Hi} } - {p}^{(J + 1)}(x,t){|}_{x = \sum_{i = 1}^J {Hi} },\end{equation}$$$$where $$R_\omega ^{(J)}$$ is the flow contact transfer coefficient. Equation (48b) represents the interface condition with a jump in pore water pressure, creating a significant relative difference in pore water pressure at the interface.…”

“…Additionally, fluids possess viscosity, and their motion at the interface involves momentum transfer with solid particles undergoing relative motion, resulting in frictional resistance. This flow contact resistance effect significantly impacts the thermal consolidation behavior of the soil 24 . Consequently, studying the thermal consolidation behavior of layered saturated soil foundations while considering the interfacial flow contact resistance effect under variable loadings holds considerable importance.…”

“…This flow contact resistance effect significantly impacts the thermal consolidation behavior of the soil. 24 Consequently, studying the thermal consolidation behavior of layered saturated soil foundations while considering the interfacial flow contact resistance effect under variable loadings holds considerable importance.…”

Interfacial flow contact resistance effect for thermal consolidation of layered viscoelastic saturated soils with semi-permeable boundaries

“…Following the calculation method [54], expression for the total water flux through the pipe can be derived as:…”