Fundamental Study of the Geological Disposal of High-Level Nuclear Waste

高放核废料地质处置基础研究

• 批准号: 11555120
• 负责人: YOSHIDA Hidenori
• 金额: $ 3.26万
• 依托单位: KAGAWA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555120/
• 关键词: High-Level Nuclear Waste; Geological Disposal; Evaluation of E.D.Z; Damage of Rock; Discontinuity; Stress Reluxation; 高レベル廃棄物; 開放応力; 硬岩

The multi-barrier concept now forms the backbone of geological disposal programs in most countries. The manufactured components of the multi-barrier system constitute an engineered barrier system(E.B.S). The EBS design is constrained by the deep geological environment where the repository is constructed. In such an environment, groundwater is reducing and fluxes are small. The engineered barrier system consists of the vitriaed waste, overpack and buffer material. The buffer material is selected to have a very low permeability, so that effectively no advective flow occurs in the EBS.However, the construction, operation and closure activities will be carried out with a minimum disturbance to the geological environment in surrounding host rock. It is important to grasp the geological environment accurately during and after the construction. Micromechanics-based continuum(MBC)theory proposed by authors can reflect the effects of density, orientation and connectivity of joints as well as the property of the joints. In this study, the MBC analysis is employed to analyze the excavation of disposal tunnel and the change of the environment around the tunnel is discussed with paying attention to joints in a rock mass through the analyses.From the numerical results, it is concluded that(1)The mechanical behavior of the rock mass is strongly affected by the direction of initial stresses, the joint density, and their combinations.(2)The shape or size of the disposal tunnel has an impact on the joint deformation.(3)These results lead that the excavation of a tunnel changes the geological environment such as permeability.(4)The numerical results before the construction of disposal institution of high-level radioactive waste give us the approximate changes of environmental properties in the institution after the excavation of caverns and tunnels.

多重屏障概念现已成为大多数国家地质处置计划的支柱。多屏障系统的制造组件构成了工程屏障系统（E.B.S）。 EBS设计受到处置库所在深层地质环境的限制。在这样的环境下，地下水不断减少，流量也很小。工程屏障系统由玻璃化废物、外包装和缓冲材料组成。缓冲材料的选择具有非常低的渗透性，因此EBS中实际上不会发生平流流。但是，施工、运营和关闭活动将在对周围围岩地质环境的干扰最小的情况下进行。准确掌握施工过程中和施工后的地质环境非常重要。作者提出的基于微力学的连续体（MBC）理论可以反映关节的密度、方向和连通性的影响以及关节的性能。本研究采用MBC分析方法对处置隧道的开挖进行分析，通过分析关注岩体节理，讨论隧道周围环境的变化。从数值结果可以得出以下结论： 1）岩体的力学行为受初始应力方向、节理密度及其组合的强烈影响。（2）处置隧道的形状或尺寸对节理变形有影响。（3）这些结果表明，隧道的开挖改变了(4)高放废物处置设施建设前的数值结果给出了洞室、隧道开挖后设施内环境性质的大致变化。

项目成果

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Boulfiza, M., Sakai, K. 等人：“健全和开裂混凝土的性能评估：第二部分。氯化物侵入”Proc.3rd.Int.Conf.on 恶劣条件环境和荷载下的混凝土 (2001)。

松山哲也, 堺孝司, 吉田秀典 他: "都市ゴミ溶融スラグを用いたコンクリートの諸特性"日本コンクリート工学年次論文報告. (登載決定). (2001)

Tetsuya Matsuyama、Takashi Sakai、Hidenori Yoshida 等：“使用熔融城市废渣的混凝土的特性”日本混凝土工程年度论文报告（2001 年出版）。

Yoshida, H., Horii, H., et.al: "Analysis of Disposal Tunnel for High-Level Radioactive Waste by Micromechanics-Based Continuum Mode"Proc.36th U.S.Rock Mech.Symp.. (登載予定). (2001)

Yoshida, H.、Horii, H. 等人：“基于微力学连续体模式的高放射性废物处置隧道分析”Proc.36th U.S.Rock Mech.Symp.（即将出版）。 ）

吉田秀典, 堀井秀之 他: "大断面トンネルにおけるMBC解析と地山挙動の評価"第30回岩盤力学に関するシンポジウム講演論文集. 48-52 (2000)

吉田英德、堀井英行等：“大断面隧道岩石行为的MBC分析与评价”第30届岩石力学研讨会论文集48-52（2000）。

Hibiya, K., Yoshida, H., et.al: "Parameter Analysis of MBC Model for Underground Caver"Proc.Eurock 2001. (登載決定). (2001)

Hibiya, K.，Yoshida, H.，等人：“地下探洞机 MBC 模型的参数分析”Proc.Eurock 2001。（已决定出版）。