Test time optimization of thermal response under bedrock geological conditions

Presents the influence of the test time on the soil thermal conductivity under bedrock geological conditions. According to the analysis of the measured data, obtains the optimal test duration of 60 h and 50 h and the abandoned initial hours of less than 20 h and 10 h for single Utype and double Utype conditions, respectively. In addition, according to the CFD software simulation, analyses the influence of test environment on long time thermal response test result.