|Table of Contents|

Review on Thermal Conductivity Coefficient of Rock and Soil Mass(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第04期
Page:
421-427,433
Research Field:
地质工程
Publishing date:

Info

Title:
Review on Thermal Conductivity Coefficient of Rock and Soil Mass
Author(s):
XU Mo1; WANG Di2; JIANG Liang-wen3; QI Ji-hong1
1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Fuzhou Investigation and Surveying Institute, Fuzhou 350003, Fujian, China; 3. China Railway Eryuan Enginee
Keywords:
rock and soil mass;  thermal conductivity coefficient;  controlled factor;  measuring method;  heat source model
PACS:
P313
DOI:
-
Abstract:
Thermal conductivity coefficient of rock and soil mass is important on the geothermic fundamental research and application. Concept, controlled factors and measuring methods of thermal conductivity coefficient were introduced. Controlled factors included stratum lithology, porosity, water content, temperature and anisotropy. Thermal conductivity coefficient ranked by descending order with stratum lithology was marine carbonate, continental clastic rock and igneous rock, and thermal conductivity coefficient of metamorphic rock was related with the parent rock and metamorphoses degree. Thermal conductivity coefficient increased when the sedimentation and depth increased. Water content had significant influence on thermal conductivity coefficient of weak rock; thermal conductivity coefficient increased with the increase of porosity; the stratum with big porosity should be checked with saturation. Thermal conductivity coefficient of different lithology was complex when the temperature changed, so it should be concluded according to the actual stratum in application. Thermal conductivity coefficient was anisotropic because of the structural plane. Measuring methods of thermal conductivity coefficient included field test, indoor test, component types distinguishing, P-wave velocity estimation, etc. Thermal conductivity coefficient with field test data was usually calculated by linear and columnar source models. Indoor test included steady and unsteady measuring methods, which were applied in the materials with low-middle and high thermal conductivity coefficient respectively. For component types distinguishing method, thermal conductivity coefficient of the parallel plate phase distribution material was anisotropic; thermal conductivity coefficient was minimum when the direction of heat exchange was parallel to parallel plate and maximum when the direction was vertical to parallel plate. For the geological unit which can not be directly measured, P-wave velocity estimation was used to calculate thermal conductivity coefficient. In order to obtain accurate thermal conductivity coefficient, optimal measuring method should be selected based on the characteristics of samples and the extent of thermal conductivity coefficient of rock and soil mass.

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Last Update: 2011-12-20