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	裂隙岩体中力学-渗流-传输耦合离散元模拟
	赵志宏 ; 井兰如 ; 宋二祥 ; Zhao Zhihong ; Jing Lanru ; Song Erxiang
	2016-03-30 ; 2016-03-30
关键词	深部地下工程 水-力-化多场耦合 裂隙岩体 离散元 linear objects line features simplification rarefying SimpliPoly algorithm TU45
其他题名	Discrete Element Modeling of Coupled Mechanical-Flow-Transport Processes in Fractured Rocks
中文摘要	深部地下工程包括增强型地热系统、核废料的地下处置、CO2地下封存、煤炭地下气化等,都涉及到复杂的水-力-化多场耦合过程。全面理解力学过程影响下的溶质(如放射性核素)传输过程是以上各类工程成功建设和安全运行的重要理论基础。本文基于离散裂隙网络模型的思想,采用离散元方法来模拟应力-渗流耦合过程,而溶质传输过程则用粒子追踪法(Particle tracking algorithm)来进行模拟。溶质传输机理主要考虑了单岩石裂隙中的平流(Advection)、弥散(Hydrodynamic dispersion)以及原岩-裂隙之间的扩散(Matrix diffusion)。结果显示,力学过程对溶质传输过程有着显著影响,会明显改变溶质在裂隙网络中的停滞时间、传输路径和位置分布等。当水力梯度较小时,原岩-裂隙之间的扩散过程将是溶质在裂隙网络中停滞时间的决定性因素。; Deep underground projects,such as enhanced geothermal system,underground nuclear waste repository,CO2 sequestration and underground coal gasification etc,involve complex coupled hydro-mechanical-chemical(HMC)processes. A solid understanding of stress effects on solute(e. g. radioactive nuclide)transport in fractured rocks is critical for design,construction,operation and performance /safety assessments of the above projects. A hybrid framework combining discrete element method for stress-flow processes and particle tracking method for solute transport is presented. The solute transport mechanisms including advection,hydrodynamic dispersion and matrix diffusion are considered. The results show that the stress can significantly influence transport process,in terms of residence time,transport path and distribution. When the hydraulic gradient is low,matrix diffusion plays a key role in solute transport through fractured rocks.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/149088]
专题	清华大学
推荐引用方式 GB/T 7714	赵志宏,井兰如,宋二祥,等. 裂隙岩体中力学-渗流-传输耦合离散元模拟[J],2016, 2016.
APA	赵志宏,井兰如,宋二祥,Zhao Zhihong,Jing Lanru,&Song Erxiang.(2016).裂隙岩体中力学-渗流-传输耦合离散元模拟..
MLA	赵志宏,et al."裂隙岩体中力学-渗流-传输耦合离散元模拟".(2016).

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