A multiple-code simulation study of the long-term EDZ evolution of geological nuclear waste repositories

A multiple-code simulation study of the long-term EDZ evolution of geological nuclear waste repositories
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地质核废料处置库长期EDZ演化的多代码模拟研究

DOI:
10.1007/s00254-008-1536-1
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发表时间:
2009-05
期刊:
Environmental Geology
影响因子:
--
通讯作者:
Kobayashi, Akira
Kobayashi, Akira
中科院分区:
其他
文献类型:
--
作者:
Lee, Hee-Suk;Huang, Xiao-Hua;Jing, Lanru;Koyama, Tomofumi;Hudson, John;Rinne, Mikael;Rutqvist, Jonny;Backstrom, Ann;Chijimatsu, Masakazu;Shen, Baotang;Feng, Xia-Ting;Pan, Peng-Zhi;Kobayashi, Akira

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该模拟研究表明,如何广泛不同的模型方法,可以适应模拟周围的加热核废料侵位漂移在断裂岩石的开挖扰动区(EDZ)的演变。该研究包括耦合热-水文-力学(THM)过程的建模,简化考虑化学耦合随时间变化的强度退化或亚临界裂纹扩展。在这项研究中应用的不同的模型方法包括边界元,有限元,有限差分,颗粒力学和弹塑性细胞自动机方法。模拟结果表明,在前100年(即,在就位和漂移闭合之后)。此外,研究结果表明,随时间变化的机械变化可能只发挥很小的作用,在第一个100年的温度和热应力的增加,而这种随时间的变化是微不足道的峰值温度后,因为降低热应力。
This simulation study shows how widely different model approaches can be adapted to model the evolution of the excavation disturbed zone (EDZ) around a heated nuclear waste emplacement drift in fractured rock. The study includes modeling of coupled thermal-hydrological-mechanical (THM) processes, with simplified consideration of chemical coupling in terms of time-dependent strength degradation or subcritical crack growth. The different model approaches applied in this study include boundary element, finite element, finite difference, particle mechanics, and elasto-plastic cellular automata methods. The simulation results indicate that thermally induced differential stresses near the top of the emplacement drift may cause progressive failure and permeability changes during the first 100 years (i.e., after emplacement and drift closure). Moreover, the results indicate that time-dependent mechanical changes may play only a small role during the first 100 years of increasing temperature and thermal stress, whereas such time-dependency is insignificant after peak temperature, because of decreasing thermal stress.
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