At present,there are two methods for measuring thermal properties of rock and soil:constant heat flow method and constant temperature method.This paper introduces the difference between the two test methods and the model algorithm.Based on the test results of a public construction project in Beijing,TRNSYS software is used to simulate the test conditions of constant heat flow method and constant temperature method respectively,and the simulation results are analyzed.By comparison,when the test time reached 48 hours,the error between the heat transfer of the two test methods simulated by software and the field test results was less than 10%,indicating that if the formation thermal property parameters around the project,such as the formation thermal conductivity and thermal diffusive rate,were known,the software simulation results could be used as the basis for the design of the early buried pipe system.It can be used as reference data for verification of subsequent thermal property survey results.In addition,according to the simulation results,due to the large temperature difference between the buried pipe fluid and the soil under the design condition in summer,in order to make the fluid reach the design condition point as soon as possible,a larger power should be selected during the constant temperature test;otherwise,the test results within 48 hours will greatly deviate from the actual value.
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