﻿ 深圳大学学报理工版

1)天津城建大学土木工程学院,天津 300384; 2)天津市软土特性与工程环境重点实验室,天津 300384; 3)新乡学院土木工程与建筑学院,河南新乡 453003

Calculation of thermal parameters of frozen soil based on the closely spaced soil column model

Chen Zhixiang1,2, Li Shunqun1,2, Xia Jinhong3, Wang Kai1,2, and Gui Chao31)School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, P.R.China2)Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, P.R.China3)School of Civil Engineering and Architecture, Xinxiang University, Xinxiang 453003, Henan Province, P.R.China

#### 备注

In order to evaluate the influence of thermal parameters on the calculation of transient temperature field of saturated frozen soil, the influencing factors of frozen soil temperature field are analyzed. A kind of soil column geometric model is put forward, and the outside of the soil column is filled with pore water. Assuming that the freezing occurs at the center of the enclosing area of the soil column and develops in column form, according to the calculation of the volume of soil, water and ice in the body at any time, and the calculation method of the soil thermal conductivity of Johansen, the relationship between the unfrozen water content and the thermal conductivity is established. According to the weighting calculation principle of specific heat and the relative density of soil and the density of water and ice, the mass ratio of soil column in different freezing time is obtained, then the relationship between unfrozen water content and specific heat is determined. According to the unfrozen water content of soil column model at different freezing time, the relationship between latent heat and freezing time is established. Based on the measured thermal conductivity and the soil column model, the relationship between specific heat and latent heat with negative temperature is obtained. The thermal conductivity, specific heat and latent heat of frozen soil under different negative temperature conditions obtained from the model are analyzed by numerical calculation software ABAQUS, and the calculated values of frozen soil temperature field are obtained. Comparing the calculated values with the measured results, it is shown that the thermal parameters obtained from the model can predict the temperature field of frozen soil.

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