Unsaturated hydro-mechanical-chemical constitutive coupled model based on mixture coupling theory: Hydration swelling and chemical osmosis
Unsaturated hydro-mechanical-chemical constitutive coupled model based on mixture coupling theory: Hydration swelling and chemical osmosis
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DOI：
10.1016/j.ijengsci.2016.04.010
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发表时间：
2016-07-01
影响因子：
6.6
通讯作者：
Small, Joe
中科院分区：
文献类型：
--
作者：
Chen, XiaoHui;Pao, William;Small, Joe
渗透性极低的土壤和岩石可作为实际的半透膜，如果含有蒙皂石粘土矿物，也有可能膨胀。本文基于非平衡动力学和毕奥弹性理论，将非饱和极低渗透膨胀岩的混合物耦合理论扩展到非饱和极低渗透膨胀岩中，发展了新的耦合数学模型，将非饱和化学渗透和水化膨胀考虑在内。亥姆霍兹自由能已被用来推导固体变形和多相输运之间的联系。扩展了达西定律，并考虑了膨胀对应力应变的影响。数学公式表明，膨胀能力可能有很大的影响，在化学渗透过程中的寄主岩石（如核废料处理）的变形，这是证明了两个代表性的情况下，通过数值模拟。该模型和分析的重要工程应用突出。(C)2016爱思唯尔有限公司版权所有
Very low permeability soils and rocks may act as actual semi-permeable membranes and also have the potential to swell if they contain smectite clay minerals. This study extends mixture coupling theory for unsaturated, very low permeability swelling rock, based on non-equilibrium dynamics and Biot's elasticity, and develops new advanced coupled mathematical formulations, by including unsaturated chemical osmosis and hydration swelling. Helmholtz free energy has been used to derive the link between solid deformation and multiphase transport. Darcy's law has been extended and the influence of swelling on stress and strain has been included. The mathematical formulation shows that swelling capacity may have a strong influence on the deformation of host rocks (e.g. for nuclear waste disposal) in the chemical osmosis process, which is demonstrated by a numerical simulation of two representative cases. Important engineering applications of this model and analysis are highlighted. (C) 2016 Elsevier Ltd. All rights reserved.