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THM Coupled Modeling in Near Field of an Assumed hlw Deep Geological disposal Repository

Journal of China University of Geosciences 2004年第4期15卷 388-394页

作者： ShenZhenyao LiGuoding LiShushen SchoolofEnvironment BeijingNormalUniversityBeijing100875China DepartmentofEnvironmentalScienceandEngineering TsinghuaUniversityBeijing100084China ChinaInstituteforRadiationProtection Taiyuan030006China

One of the most suitable ways under study for the disposal of high-level radioactive waste (hlw) is isolation in deep geological repositories. It is very important to research the thermo-hydro- mechanical (THM) coupled processes associated with an hlw disposal repository. Non-linear coupled equations, which are used to describe the THM coupled process and are suited to saturated-unsaturated porous media, are presented in this paper. A numerical method to solve these equations is put forward, and a finite element code is developed. This code is suited to the plane strain or axis-symmetry problem. Then this code is used to simulate the THM coupled process in the near field of an ideal disposal repository. The temperature vs. time, hydraulic head vs. time and stress vs. time results show that, in this assumed condition, the impact of temperature is very long (over 10 000 a) and the impact of the water head is short (about 90 d). Since the stress is induced by temperature and hydraulic head in this condition, the impact time of stress is the same as that of temperature. The results show that THM coupled processes are very important in the safety analysis of an hlw deep geological disposal repository.

关键词： hlw disposal thermo-hydro-mechanical (THM) coupled equations modeling.

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Basic analysis of rock mechanical and thermal properties in South Korea

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Rock Mechanics Bulletin 2023年第3期2卷 66-77页

作者： Byung-Gon Chae Eui-Seob Park Hyoung-Chan Kim Korea Institute of Geoscience and Mineral Resources(KIGAM) Deep Subsurface Storage and Disposal Research Center34132DaejeonSouth Korea Korea Institute of Geoscience and Mineral Resources(KIGAM) Groundwater Environment Research Center34132DaejeonSouth Korea

This study analyzed the mechanical and thermal properties of various rock types found in South *** results showed that both igneous and metamorphic rocks possess higher strength compared to sedimentary *** Young's modulus of rocks is dependent on the extent of weathering they have *** average cohesion of granites was found to be relatively higher compared to other rock types,and their friction angle also exhibited a relatively high value with a considerable *** results of uniaxial compression strength testing with respect to depth revealed that rock strength generally increased with depth,however,there was a large variance in strength distribution in each depth *** on these findings,it can be concluded that South Korea can also secure hlw disposal sites and facilities in terms of rock mechanics by using crystalline rocks,similar to countries such as Sweden and Finland where disposal facilities are being *** the thermal properties of rocks,they are influenced by the distribution of the parent *** thermal conductivity is highly concentrated in the southwest and central regions of South Korea,while the geothermal gradient is high in the northeast,west,and some parts of the southeast *** southeast region of Korea has a high geothermal heat flow,and some central northern regions also exhibit relatively high geothermal heat *** light of these distributional characteristics,it is crucial to continue conducting precise studies on the mechanical and thermal properties of rocks in the future disposal depths of spent nuclear fuel.

关键词： Rock mechanics Thermal properties hlw disposal Crystalline rocks

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Mineralogy and Geochemistry of Fracture Fillings in Beishan Granite for High-level Radioactive Waste disposal

Mineralogy and Geochemistry of Fracture Fillings in Beishan ...

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作者： Xiao TIAN Ju WANG Beijing Research Institute of Uranium Geology

In order to understand the conditions of paleo-groundwater and redox in deep geological environment for high-level radioactive waste disposal,fracture mineral investigations focusing on mineralogy and geochemistry have been preliminarily performed during site characterization in Beishan *** main types of fracture minerals contain calcite,clay minerals,chlorite,hematite and quartz,and most of them show no systematic variation in terms of occurrence with *** major and trace element compositions of fracture fillings depend on types and contents of specific minerals,as well as probably controlled by the rock type,groundwater chemistry and water/rock interaction.

关键词： Fracture filling Site characterization hlw disposal Beishan area

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