|Table of Contents|

Test and Calculation Situation Analysis of Thermal Conductivity of Frozen Soil(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年02期
Page:
101-115
Research Field:
Publishing date:

Info

Title:
Test and Calculation Situation Analysis of Thermal Conductivity of Frozen Soil
Author(s):
CHEN Zhi-xiang1; 2;  LI Shun-qun2;  XIA Jin-hong3;  FENG Yan-fang2;  LIU Zhi-feng2; 4
(1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, Liaoning, China; 2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Chengjian University, Tianjin 300384, China; 3. School of Civil Engineering and Architecture, Xinxiang University, Xinxiang 453003, Henan, China; 4. School of Materials and Engineering, Tianjin Chengjian University, Tianjin 300384, China)
Keywords:
geotechnical engineering;  frozen soil;  thermal conductivity;  unfrozen water content;  calculation model;  temperature measurement method
PACS:
P642.14
DOI:
-
Abstract:
In order to cognize the current situation of the test and calculation methods of frozen soil thermal conductivity, thus to serve the calculation of temperature field of frozen soil. The research background of frozen soil thermal conductivity and the contribution of thermal conductivity to the temperature field of frozen soil were summarized, the reasons of the composition and thermal conductivity of frozen soil vary with negative temperatures were analyzed. The contents, advantages, disadvantages and errors of the testing technology, calculation method, theoretical calculation model of frozen soil thermal conductivity were introduced, and determination method of solid minerals thermal conductivity were described. The existing research results of frozen soil thermal conductivity with temperature, dry density, moisture content and other factors were summarized. The error and its reasons for the frozen soil thermal conductivity based on the temperature measurement method were analyzed, and a preliminary correction method for the thermal conductivity of frozen soil test was proposed. On the basis, the suggestions and prospects for the test technology and calculation methods of frozen soil thermal conductivity were put forward. The result shows that both temperature control environment and latent heat of phase change have effects on the testing process of thermal conductivity, it is theoretically feasible to modify the effect of latent heat on the thermal conductivity testing process from the view of frozen water content. The linear regression model should consider the initial effect of soil mineral on the thermal conductivity values, the theoretical model of thermal conductivity established from the point of heat balance between phases plays an important role in the studying of temperature field analytical problem. Considering the porous characteristics of soils, deducing the method for determining the thermal conductivity of soil mineral with being independent of densities, which plays a fundamental role in improving the prediction accuracy of the calculation model of frozen soil thermal conductivity. From the view of microcosmic point and considering the difference between frozen soil and conventional soil, it is an important direction to establishing the thermal conductivity model reflecting the freezing rate of soil. Considering the influence of thermal conductivity, specific heat, and latent heat on temperature field, it is necessary to verify the reliability of the calculation model of thermal conductivity from the point of temperature field. The conclusions can be used as reference for the study of analytical solution of frozen soil temperature field and the prediction of temperature field in freezing construction.

References:

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Last Update: 2019-03-27