Network Modelling of the Influence of Swelling on the Transport Behaviour of Bentonite
Network Modelling of the Influence of Swelling on the Transport Behaviour of Bentonite
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DOI：
10.3390/geosciences6040055
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Ignatios Athanasiadis;S. Wheeler;P. Grassl
中科院分区：
文献类型：
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作者：
Ignatios Athanasiadis;S. Wheeler;P. Grassl
膨润土的润湿是一个复杂的流体力学过程，涉及膨胀，并且如果被限制，其孔隙结构中的显著结构变化。本文提出了一个耦合结构传输网络模型，研究了膨润土润湿对保留电导率和膨胀压力响应的影响。分别代表空隙和喉道的球体和管道的传输网络依赖于拉普拉斯-杨方程来模拟润湿过程。结构网络使用一个简单的弹塑性的方法，没有硬化模型的重新安排的织物。膨胀是以特征应变的形式引入到结构单元中的，结构单元与充水球体相邻。对于一个受约束的细胞，膨胀被证明产生塑性应变，这导致在减少的管道和球体空间，因此，影响的导电性和保留行为。
Wetting of bentonite is a complex hydro-mechanical process that involves swelling and, if confined, significant structural changes in its void structure. A coupled structural transport network model is proposed to investigate the effect of wetting of bentonite on retention conductivity and swelling pressure response. The transport network of spheres and pipes, representing voids and throats, respectively, relies on Laplace–Young’s equation to model the wetting process. The structural network uses a simple elasto-plastic approach without hardening to model the rearrangement of the fabric. Swelling is introduced in the form of an eigenstrain in the structural elements, which are adjacent to water filled spheres. For a constrained cell, swelling is shown to produce plastic strains, which result in a reduction of pipe and sphere spaces and, therefore, influence the conductivity and retention behaviour.