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Mechanics of Discontinuous Solids for the Safety Evaluation of Nuclear Waste Disposal- Development of Coupled Flow Analysis Method

核废料处置安全评价的不连续固体力学——耦合流动分析方法的发展

基本信息

批准号：
13555127
负责人：
HORII Hideyuki
金额：
$ 5.76万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Due to the defomiation of sliding opening of joints in fractured rock mass, consequent changes in the flow characteristics of jointed rock mass would be anticipated. The effect of deformation of joints are clarified by newly developed FE analysis method, which enable us to investigate both mechanical and hydraulic property of a joint whose surface geometry is obtained from existing rock joints. In the present study, a number of numerical techniques are employed in order to evaluate the excavation-induced changes in hydraulic properties of jointed rock mass. These are represent by the Micromechanics-Based Continuum (MBC) model analysis (FE excavation analysis in jointed rock mass), FE flow and transport analysis in the dscrete network of joints, and a separate computational module connecting these two techniques which is incorporated to modify initially imposed transmissivity into the excavation-induced ones. The effect of excavation on the hydraulic properties is evaluated by including this excavation-induced transmissivity of individual joints in the FE flow analysis in jointed rock mass. The excavation induced transmissivity of individual joint is calculated by the numerical and analytical techniques developed for flow through a single rock joint. The calculation of the excavation-induced transmissivity involves the distribution of shear displacement and normal stress around the excavation, and implicitly takes into account the effect of surface geometric roughness. Using the proposed model, test simulation for a deep underground repository is performed to illustrate the typical trends predicted in the pesent method.

由于裂隙岩体中节理的滑动张开变形，其流动特性将随之发生变化。新开发的有限元分析方法，使我们能够调查的力学和水力性能的关节，其表面几何形状从现有的岩石节理的变形的效果澄清。在本研究中，采用了一些数值技术，以评估开挖引起的节理岩体水力特性的变化。这些都是代表基于微观力学的连续体（MBC）模型分析（有限元开挖分析节理岩体），有限元流动和运输分析中的dscrete网络的关节，和一个单独的计算模块连接这两种技术，这是合并到修改最初施加transmittance到挖掘引起的。开挖对水力特性的影响进行了评估，包括在有限元流动分析中，在节理岩体开挖引起的transdischarge的个别关节。开挖引起的个别关节的transmittance计算的数值和分析技术开发的流动通过一个单一的岩石节理。开挖引起的位移计算涉及到开挖周围的剪切位移和正应力的分布，并隐含地考虑了表面几何粗糙度的影响。利用所提出的模型，对一个深埋地下处置库进行了试验模拟，以说明该方法预测的典型趋势。