Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Mori, Koji*; Neyama, Atsushi*; Nakagawa, Koichi*
JNC TJ8400 2000-064, 175 Pages, 2000/03
JNC-TJ8400-2000-064.pdf:5.23MB
In this study, the following tasks have been performed in order to evaluate the stability of earthquake resistance for the engineered barrier system(EBS) of High Level Waste (HLW) geological isolation system. (1)validation studies for the liquefaction model. The function of single-phase analysis without interaction between soil and pore water in three-dimensional effective stress analysis code, which had been developed in this study, have been verified using by actual vibration test data. This fiscal year, some validation studies for the function of liquefaction analysis was conducted usig by actual measured data through the laboratory liquefaction test. (2)Supplemental Studies for JNC Second Progress Report. Through the JNC second progress report, it was considered that the stability of earthquake resistance of the engineered barrier system would be maintained under the major seismic event. At the same time we have recognized that several model parameters for joint-crack element, which takes into account for the response behavior of material discontinuous surface such as between overpack and buffer material, will become important in the response behavior of the whole EBS. This year, we have studied about several topics, which arise from technical discussion on JNC second progress report and we have discussed about total seismic stability of EBS. (3)Supplemental Studies for joint study with NRIDP. At this fiscal year, the joint study with National Research Institute for Disaster Prevention (NRIDP) will be final stage. UP to this day, incremental validation studies had been continued using by mesuared data obtained from vibration test. In this final stage, validation analysis has been conducted again using by current version new analysis code and maintained the validation data which will be contribute to the joint study mentioned above.
Furuya, Kazuo*; *; Kodama, Toshio*
PNC TJ7705 97-001, 154 Pages, 1997/03
no abstracts in English
; ; Adachi, Tetsuya; Sato, Toshinori;
PNC TN7410 95-049, 47 Pages, 1995/10
Excavation of a shaft or a horizontal drift in a rock mass probably affects the rock mass around the underground openings. It is necessary in the design, construction and safety assessment of underground facilities to consider the properties and extent of the EDZ (Excavation Disturbed Zone; the zone where rock properties and rock conditions have been changed due to excavation). In-situ experiment on excavation disturbance has been carried out in the Tono mine and the controlling factors of properties and extent of the EDZ due to blasting has been studied. In order to evaluate dependence of the change of properties and extent of the EDZ on excavation method, Machine Excavation Effects Experiment has been carried out. In FY 1992, a horizontal drift for measurements was excavated. A horizontal drift parallel to the measuring drift is scheduled to be excavated by a machine in FY 1995. The investigations and numerical analysis before excavation of the test drift were carried out in FY 1993 and FY 1994. The objectives of the investigations and numerical analysis carried out in FY 1993 and 1994 are as follows: (1)to measure and evaluate the rock properties and the rock conditions around the test drift before excavation, and (2)to predict the displacements and stress change during excavation of the test drift. The investigations and numerical analysis in FY 1994 consist of the following items: (1)core logging and borehole wall observation, (2)installation of extensometers, and (3)numerical analysis with the Finite Element Method. This report describes the details of the investigations and numerical analysis carried out in FY 1994.