Influence of time-dependence on failure of echelon rock joints through a novel DEM model
Influence of time-dependence on failure of echelon rock joints through a novel DEM model
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DOI：
10.1080/19648189.2015.1064624
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发表时间：
2015-09
影响因子：
2.1
通讯作者：
M. Jiang;Chao Sun;A. Rodriguez-Dono;Ningxi Zhang;J. Shao
中科院分区：
文献类型：
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作者：
M. Jiang;Chao Sun;A. Rodriguez-Dono;Ningxi Zhang;J. Shao
本文研究了化学风化对平行岩石节理剪切破坏行为的时间依赖性影响，这种影响可以看作是岩石材料的广义时间依赖性。将表征键合材料累积相对质量去除量的时变参数α引入到一种新的离散元键合接触模型中。该模型是基于一系列的力学性能测试与不同的键合几何铝杆。对不同α值的梯形节理直剪数值试验结果表明，随α值的增大，岩石节理的起裂应力和峰值应力均减小。这是伴随着不断增长的比例的微观压缩-剪切-扭转（CST）粘结失效的粘结失效的总次数，除了没有风化的影响的情况下。高α值使材料桥成为待切割的较弱部分，沿中心剪切轴沿着产生大量CST粘合断裂。
This article investigates the time-dependent influence on the shear failure behaviour of parallel rock joints in the echelon arrangement due to chemical weathering, which can be treated as a generalised time-dependency of the rock material. A time-dependent parameter α, identifying the accumulated relative mass removal of bonding material, has been implemented into a novel distinct element method bond contact model. This model is based on a series of mechanical test on bonded aluminium rods with different bond geometries. The numerical direct shear test results of echelon rock joints characterised by different values of α show that increasing time-dependent parameter α can lead to a lower crack initiation and peak stresses. This is accompanied by a growing ratio of the microscopic compressive–shear–torsional (CST) bond failure number of bond failures to the total number of failures, except for the case without weathering influence. High values of α render the material bridge a weaker part to be cut through, generating a large number of CST bond breakages along the central shear axis.