PROBLEM TO BE SOLVED: To simplify processing from acquisition of measurement data for soil to calculation of soil's characteristic heat resistance and realize acquisition of a highly accurate soil's characteristic heat resistance value.;SOLUTION: A soil's characteristic heat resistance measuring device acquires measurement data that consists of: soil temperature detected by thermocouples 3b to 3d; and elapsed time after the start of energization to a heater 3. The device preliminarily generates a regression line approximated to the measurement data in a period from first elapsed time t1 after the start of the energization to second elapsed time t2 later than the first elapsed time t1, among the acquired measurement data, and calculates a correlation coefficient ρ between the measurement data in the period from the first elapsed time t1 to the second elapsed time t2 and the regression line. When the calculated correlation coefficient ρ is equal to or greater than a prescribed reference value of 0.8, the device calculates temperature values θ1 and θ2 at the first elapsed time t1 and the second elapsed time t2 from a gradient of the regression line, and then calculates soil's characteristic heat resistance on the basis of the first elapsed time t1, the second elapsed time t2 and the temperature values θ1 and θ2 at the first elapsed time and the second elapsed time.;COPYRIGHT: (C)2014,JPO&INPIT
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