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.

已经进行了二维大型物理模型研究，以研究由于高岩力应力状态下分层沉积物中深洞穴的发掘而导致的机械变化。为此，已经开发了相同的沉积分层地层模型材料。可以清楚地看出，该模型可以精确模拟根据煤矿开采活动发生的煤层岩石质量的破裂和/或变形的现象。还可以清楚地看到，深层散落的洞穴继续与开挖的进展相结合，并伴随着周围的松弛区域的发展，最后实现了天花板和地板之间的接触，产生了接触压力，这在Tern中带来了松动岩石质量的压实。可以预料，在最后阶段，挖掘空间的完全封闭，即消除地下空间。这意味着岩石应力状态和岩石质量特性在内，包括强度和允许，将返回其前矿体状态。这个过程将很快发展。从与高放射性废物的密封能力的观点角度来看，这些质量沉积岩石的特征很有趣。将需要进一步研究以确定沉积岩质量是否适合核废料的地质处置地点。