－20 ℃～50 ℃范围内盐岩的热导率研究

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Abstract To study the thermal conductivity of salt rock at temperature ranges from －20 ℃ to 50 ℃，a mathematical model of inverse heat conduction problem is established which is based on the analysis of test results of heat conduction for salt rock samples at the initial temperature of －20 ℃，0 ℃，20 ℃，45 ℃. According to information on the boundary conditions and the test results of the internal temperature distribution field，using implicit finite difference scheme and combining Matlab numerical solution procedures to solve the inverse problem，the function expression of thermal conductivity coefficient is defined. The function expression is applied into finite element procedure to simulate temperature field. Compared with the experimental results，the two fit well. The results show that the relationship between the thermal conductivity of salt rock at temperature ranges －20 ℃ to 50 ℃ and absolute temperature yields is parabolic，and the thermal conductivity drops when the temperature rises. The determination of thermal conductivity of salt rock at temperature range from －20 ℃ to 50 ℃ would provide certain guiding significance for study of temperature effects of variety of mechanical properties of rock salt as well as actual project application in salt rock storage caverns.

Key words： rock mechanics salt rock thermal conductivity coefficient inverse heat conduction problem temperature field implicit difference scheme finite element simulation

Received: 28 April 2012

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http://www.rockmech.org/EN/Y2012/V31/Is2/3725

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