Saturated dislocations transient propagation-evolution in olivine structure under ultra high-coupled thermal-force fields

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• 作者：B.J. Zhu^a ; ^b ; ^{cynosureorion@gucas.ac.cn} ; C. Liu^a ; ^b ; ^c ; Y.L. Shi^a ; ^b ; X.Y. Liu^a ; ^b
• 关键词：Saturated dislocations propagation&ndash ; evolution ; Molecular-micro-transient scale fracture model ; Flow driven pore-network crack model ; First principle ; Ionic fluid transport&ndash ; dehydration ; Ultra high temperature and pressure
• 刊名：Theoretical and Applied Fracture Mechanics
• 出版年：2012
• 期刊代码：174_01678442
• 类别：et
• 出版时间：April, 2012
• 卷：58
• 期：1
• 页码：9-20
• 文件大小：7072 K

摘要

Based on the first principle and flow driven pore-network crack theory, the crystal size saturated dislocations transient (10^鈭?-10^鈭? s) propagation-evolution in olivine structure under ultra high-coupled temperature (200-500 掳C) and pressure (0.4-1 GPa) are studied on the parallel CPU&GPU platform. First, the molecular-micro-scale transient fracture model is established by using hybrid hypersingular integral equation and Lattice Boltzmann method, the hydrogen ion and oxonium ion transport-dehydration (HI-OI-TD) in olivine [(FeMg)SiO₄] crystal are explored. The bond-strength-length as function of thermal-force-time fields, the limited thermal-force value for HI-OI-TD through the crystal, and the ion state water adsorption in the crystal are calculated, respectively. Then, based on the above results, the crystal size saturated dislocations/defects propagation-evolution is studied. The relationship between the stress distribution and micro-strain under different velocity-time conditions, the saturated dislocations/defects propagation-evolution as function of coupled thermal-force-time fields are obtained. All these findings can helpful understand the mechanism of the dehydration fracturing shale gas, the coal-gas outbursts, and the coseismic triggering issues.