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.

多屏障概念现已成为大多数国家地质处置方案的支柱。多屏障系统的制造组件构成工程屏障系统（E.B.S）。EBS的设计受到建造处置库的深层地质环境的制约。在这样的环境中，地下水正在减少，流量很小。工程屏障系统由玻璃化废物、外包装和缓冲材料组成。选择的缓冲材料具有非常低的渗透性，因此在EBS中实际上不会发生平流。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。在施工过程中和施工结束后，准确掌握地质环境至关重要。作者提出的基于细观力学的连续介质（MBC）理论可以反映节理的密度、取向和连通性以及节理的性质。本文采用MBC分析方法对排土洞开挖过程进行了分析，并通过分析讨论了排土洞周围环境的变化，同时考虑了岩体中的节理，从数值结果可以看出：（1）初始应力方向、节理密度及其组合对排土洞围岩的力学行为有很大影响;（2）排土洞的形状或大小对节理变形有影响。（3）隧道开挖改变了渗透性等地质环境。（4）高放废物处置场建设前的数值模拟结果给出了高放废物处置场洞室开挖后环境特性的大致变化。

项目成果

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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）。

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）。

Jongpadist, P.and Horii, H.: "Analysis of Creep and Progressive Failure for Tunnel in Soft Rock"Proc. 1st Int. Conf. on Computer Methods and Advances in Geomech. A.A.Balkema. (to be appeared). (2001)

Jongpadist, P. 和 Horii, H.：“软岩隧道蠕变和渐进破坏分析”Proc。

山下英俊,堺孝司,嶋田久俊,丸茂文夫: "セメント硬化体の超音波伝播速度に及ぼす骨材および細孔構造の影響"日本コンクリート工学年次論文報告集. Vol.21,No.2. 1273-1278 (1999)

Hidetoshi Yamashita、Takashi Sakai、Hisatoshi Shimada、Fumio Marumo：“骨料和孔隙结构对硬化水泥超声波传播速度的影响”日本混凝土工程年报报告第 21 卷，第 2 期。1273 -1278 (1999)

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）。