2:15 PM - 2:30 PM
[HCG25-15] For development of evaluation technique for long term behavior between engineered barrier and host rock in near field
Keywords:Geological disposal, Long term behavior evaluation, Centrifuge model test, Coupled analysis
Constructing the method of the validation and verification of the evaluation of the long term behavior (such as the numerical simulation), it has been carried out in the following viewpoints in the present study.
1) Organizing of environmental factors that affect the long term integrity of engineered barrier (thermal, mechanics, hydraulic, etc.).
2) Employment of numerical code of coupled thermal-hydraulic-mechanical (THM) processes.
3) Considering various environmental conditions to which are exposed after the emplacement of an engineered barrier, the equivalent data of long term behavior is measured by a centrifuge model test which can be time acceleration test on the basis of the scaling law of centrifugal force field.
4) In the period of several decades in which the surrounding of the waste is headed for saturation, it is considered that mechanical behavior is the most dominant by the reflooding of groundwater in post-closure. Therefore, the evaluation period by centrifuge model test requires period in which the behavior of the post-saturation can also be partially measured.
5) In order to reduction of uncertainty in input value in numerical analysis, we measure the physical properties of the material used in the centrifuge model test, and enter the value in the numerical analysis code.
6) We conduct a sensitivity analysis in parameters of the numerical analysis code, and reveal the sensitivity of the parameters.
7) Then, we improve the accuracy of the analysis code by comparing the results of numerical simulation and centrifuge model test, and contribute to the validation of the evaluation technique of long term behavior.
This research includes portions of the results of the “Study on Performance Evaluation for Engineering Components of HLW,FY2015” under a grant from the Agency for Natural Resources and Energy (ANRE) in the Ministry of Economy, Trade and Industry (METI) of Japan.