The Analitical evaluation of coupled thermal-hydro-mechanical experiment

Amemiya, Kiyoshi*; TRAN DUC PHI*; Yamashita, Ryo*

In the case of geological disposal of high level radioactive wastes, a coupled Phenomenon involving thermal (T), hydrological(H), and mechanical (M) processes occurs in the buffer materials and surrounding rocks. This coupled phenomenon implies hydromechanical (HM) processes by heat dispersion, thermomechanical (TM)processes by ground water seepage, and thermohydrological (TH) processes by swelling of buffer materials and deformation of surrounding rocks. In order to understand the deep geological condition in fractured crystalline rock, JNC initiated the in-situ experiments in the Kamaishi Mine, where early Cretaceous granodiorite hosts the experiments. The coupled thermo-hydro-mechanical (T-H-M) experiment in situ has been planned as a task of Kamaishi in-situ experiments in order to establish the coupled T-H-M conceptual models and to build up confidence to the mathematical models and computer codes. The T-H-M experiment has the following two test phases. The first is heating phase, and the second is cooling phase. Throughout the experiment, data concerning T-H-M phenomena was obtained. In this research the data is examined and analysis or T-H-M phenomena is performed. And the mechanical behavior of test pit is analyzed by using discontinuity deformation method. These results have been presented at the international co-operative research program. The shearing properties of buffer material are either examined.