A Physical Model Study on Elimination of Underground Space

地下空间消除的物理模型研究

• 批准号: 05452314
• 负责人: ISHIJIMA Yoji
• 金额: $ 4.61万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452314/
• 关键词: 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

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.

开展二维大型物理模型研究，研究高岩石应力状态下分层沉积物中深部洞穴开挖引起的力学变化。为此，开发了沉积层状地层的等效模型材料。事实证明，该模型可以精确模拟采煤区周围煤系岩体因采煤活动而发生的破裂和/或变形现象。还可以看出，随着开挖的进展，深部溶洞不断闭合，周围松弛区不断发展，最终实现顶板与底板的接触，产生接触压力，进而产生压实作用。松散的岩体。预计在最后阶段，将导致挖掘空间的完全封闭，即地下空间的消除。这意味着岩石应力状态和岩体特性（包括强度和渗透率）将恢复到开采前的状态。这一过程将很快推进。从对高放射性废物的密封能力的角度来看，泥质沉积岩的这些特征很有趣。需要进一步调查以确定沉积岩体是否适合核废料地质处置场。