| Project/Area Number |
05452314
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
資源開発工学
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
ISHIJIMA Yoji Hokkaido Univ., Fac.of Eng., Professor, 工学部, 教授 (10011115)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
FUJII Yosiaki Hokkaido Univ., Fac.of Eng., Instructor, 工学部, 助手 (70192309)
NAKAMURA Akira Hokkaido Univ., Fac.of Eng., Instructor, 工学部, 助手 (60125333)
|
|---|
| Project Period (FY) |
1993 – 1994
|
| Project Status |
Completed (Fiscal Year 1994)
|
| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥6,400,000 (Direct Cost: ¥6,400,000)
|
|---|
| Keywords | Physical model study / Geological disposal / Sealing ability / Coal measure strata / Equivalent model / Closure of the excavated space / Stratified strata / Elimination of the underground space / 層理面 / 変形・破壊挙動 / 地層模型 / 強度特性 / 累層構造 |
|---|
| Research Abstract |
Two dimensional large scale physical model study has been conducted to investigate the mechanical change due to the excavation of the deep cavern in the stratified sediments under the high rock stress states. For this purpose, equivalent model materials of the sedimentary stratified strata has been developed. It is cleared that the model can precisely simulate the phenomena of fracturing and/or deformation of the coal measure rock mass around the excavated area, occurring in accordance with the coal mining activities. It is also cleared that the deeply loacated cavern continue to close with progress of excavation accompanyed by development of the relaxd zone around it, and finally contact between the ceiling and the floor is realized, yielding the contact pressure, which in tern brings about the compaction of the loosened rock mass. It is anticipated that, in the final stage, complete closure of the excavated space, that is, elimination of the under-ground space is induced. This means that the rock stress states and the rock mass properties including strength and permiability, will return to their pre-mining states. This process will rather quickly advance.
These characteristics of the argillaceous sedimentary rock are interesting from view points of sealing ability against the high radioactive waste. Further investigation will be required to determine whether the sedimentary rock mass is suitable for the site of the geological disposal of nuclear waste.
|
