Correlation analyses of effects of temperature on physical and mechanical properties of clay |
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Authors: | Weiqiang Zhang Qiang Sun Yuliang Zhang |
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Affiliation: | 1.Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education,China University of Mining and Technology,Xuzhou,People’s Republic of China;2.School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,People’s Republic of China |
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Abstract: | In determining the physical and mechanical parameters of clay, it is sometimes necessary to determine them indirectly from other parameters since they cannot be measured directly from laboratory or field tests. In order to determine the effect of temperature on the behavior of clay, an indirect approach is used here by analyzing the changes of mass ((Delta m)), density ((rho)), porosity ((phi)), P-wave velocity (({v_p})), thermal conductivity ((lambda)), specific heat capacity (c), resistivity (R) and uniaxial compressive strength (f) of clay from eastern China for a temperature range between 20 and 800 °C. The results indicate that temperature has a significant effect on these parameters. Comparisons between (Delta m) and (rho), (Delta m) and ({v_p}), (rho) and ({v_p}), (phi) and (lambda), ({v_p}) and f, R and f show a linear change among these parameters,whereas the relationships among (Delta m) and (phi), (phi) and ({v_p}), (phi) and R, ({v_p}) and (lambda), (phi) and f are exponential. It is difficult to obtain these relationships by using regression analysis with high levels of accuracy. Further refinement is therefore required. |
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