PROPOSAL OF THERMOPHYSICAL PROPERTIES EVALUATION METHOD OF BEDROCK BY IN-SITU TEST AND NUMERICAL ANALYSIS USING CHARACTERISTICS OF UNDERGROUND SPACE IN OYA AREA

Abstract

 In order to continuously use the cold energy of the underground space at the Oya stone mining sites, it must be properly predicted the temperature rise of the underground space. Forecasting by numerical simulation requires thermophysical properties of Oya stone. However, Oya stone has different lithofacies depending on the location, and the thermophysical properties show higly uneven distribution. Accurate future prediction requires evaluation of the spatial thermophysical property distribution in the area. Therefore, we proposed a simple evaluation method of thermophysical properties based on an in-situ survey method using underground space and one-dimensional unsteady heat conduction analysis. The in-situ test data were obtained from the previous test performed by Utsunomiya City. As a result, the reproducibility calculation of the test using the thermophysical properties by the existing literatures were well reproduced. Therefore, the usefulness of the proposed method was confirmed. In addition, the tasks to be solved for future practical application were grasped.