Scale effects on strength of geomaterials, case study: Coal
Scale effects on strength of geomaterials, case study: Coal
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DOI：
10.1016/j.jmps.2011.01.009
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发表时间：
2011-05-01
影响因子：
5.3
通讯作者：
Khanal, Manoj
中科院分区：
文献类型：
--
作者：
Scholtes, Luc;Donze, Frederic-Victor;Khanal, Manoj
利用离散元模型研究了尺度效应对煤体强度的影响。该模型的关键在于它能够区分“严格样本量”效应和“离散断裂网络(DFN)密度”对力学响应的影响。进行了真三轴压缩试验的模拟，以确定它们各自的作用。在考虑低分辨率位形的情况下，详细研究了离散单元模型的离散化尺寸分布可能引起的偏差。该模型能够定量地再现最大强度对样品大小的依赖关系。这种关系主要依赖于DFN密度。对于所有给定的尺寸，只要DFN密度保持恒定且均匀分布，或者如果所考虑的介质中没有间断，则材料的最大强度保持恒定。皇冠版权所有(C)2011由爱思唯尔有限公司出版。保留所有权利。
Scale effects on the strength of coal are studied using a discrete element model. The key point of the model is its capability to discriminate between the "strictly sample size" effect and the "Discrete Fracture Network (DFN) density" effect on the mechanical response. Simulations of true triaxial compression tests are carried out to identify their respective roles. The possible bias due to the discretization size distribution of the discrete element model is investigated in detail by considering low-resolution configurations. The model is shown to be capable of quantitatively reproducing the dependency of the maximum strength on the size of the sample. This relationship mainly relies on the DFN density. For all given sizes, as long as the DFN density remains constant with a uniform distribution or if discontinuities are absent in the considered medium, the maximum strength of the material remains constant. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.