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Inoue, Hiroyuki*; Yoshino, Naoto; Miyanomae, Shunichi*; Mizutani, Kazuhiko*; Noda, Kenji*
JNC TJ8400 2004-005, 161 Pages, 2004/02
JNC-TJ8400-2004-005.pdf:18.59MB
In this study, the laboratory mechanical tests of sedimentary soft rock sampled at HORONOBE area in HOKKAIDO prefecture were conducted in order to build the confidence of OKUBO model for long term deformation of sedimentary rock. And the stability of rock around tunnel in building under the condition assumed the underground of HORONOBE area was examined by numerical simulation using information of boring data obtained before 2002 year. As a result, authors could obtain many values of parameter in OKUBO model under various conditions. These conditions have the difference of temperature and water saturation. In addition, the life time in creep predicted by OKUBO model could be compared with the real one. And numerical simulations, assuming various conditions such as stiffness of buffer material and yielding of support, had been carried out to evaluate the long-term stability of rock surrounding buffer material. Results show the decreasing tendency of time dependency of rock.
Inoue, Hiroyuki*; Noda, Kenji*
JNC TJ8400 2002-011, 95 Pages, 2002/02
JNC-TJ8400-2002-011.pdf:9.14MB
When a formation disposal system is thought about, it is important to evaluate long-term dynamics behavior of boundary condition and near field bedrock of an artificial barrier adequately. In this study, three matters were executed for improvement of a dependability of the evaluation as follows. (1)Creep test was executed as purpose by dependability improvement of evaluation technique of creep problem by Okubo model. Okubo model constant was calculated than the unconfined compression test which let strain rate change with true rock, and the creep test which the constant was used, and estimated breaking time was done. As a result, the estimation of breaking time by Okubo model almost suffered according to the estimation although a variation of test-piece influenced it. (2)A tunnel model apparatus was produced in the purpose which grasped near field bedrock behavior, and it was tested. Simulation rock test body of 1m 
1m 0.5m was used for a test, and 15cm tunnel excavation was carried out in an initial stress bottom. Quantities of inner space displacement were measured in a test, and a hardness-test was done after dismantlement, and looseness area was grasped quantitatively. As a result, the looseness area was able to be estimated with about 17.5cm than tunnel center position. (3)A test approach in deep underground laboratory was examined, and examination / the in situ test which took advantage of rock core analysis / borehole as purpose and done examination item by grip of long-term bedrock behavior (a bord is taken advantage of, and bord itself is used) was shown. In addition, layout of the deep underground laboratory which carried out various tests about long-term behavior in 3 depth was shown.