当前位置: X-MOL 学术Eng. Fract. Mech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Incorporating asperity strength into rock joint constitutive model for approximating asperity damage: An insight from DEM modelling
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.engfracmech.2021.107744
Mahdi Saadat , Abbas Taheri , Youhei Kawamura

This paper presents a DEM experiment for developing a rock joint constitutive model that is able to consider lab-scale geometrical parameters of waviness and unevenness. We carried out a systematic parametric study using DEM framework to investigate the influence of asperity area and asperity angle on the peak shear strength and peak dilation angle. Based on the insights obtained from numerical outputs, we defined an asperity strength parameter that was incorporated into the failure criterion of the rock joint model. We defined an asperity damage function to characterise the degradation of asperity strength parameter. Besides, we developed a separate damage function to consider the deterioration of frictional components of rock joints. Also, we augmented the dilative response of the rock joint model by defining a new dilation predictor that mimics the normal displacement with respect to the progressive shear displacement of the rock joint. The damage function was linked to plastic displacement of rock joint in all damage functions. We compared the model outputs with the results of experimental direct shear tests conducted on natural rock joints and observed a good agreement.



中文翻译:

将粗糙强度整合到岩石节本构模型中以近似粗糙损伤:DEM建模的见解

本文介绍了一个DEM实验,该实验用于开发岩石节本构模型,该模型能够考虑实验室规模的波纹度和不均匀度的几何参数。我们使用DEM框架进行了系统的参数研究,以研究粗糙面面积和粗糙面角度对峰值剪切强度和峰值膨胀角的影响。基于从数值输出中获得的见解,我们定义了一个粗糙强度参数,该参数被并入到岩石节理模型的破坏准则中。我们定义了一个粗糙损伤函数来表征粗糙强度参数的下降。此外,我们开发了一个单独的损伤函数来考虑岩石节理的摩擦分量的恶化。还,我们通过定义一个新的膨胀预测变量来增强岩石节理模型的扩张响应,该预测因子模拟了相对于岩石节理的渐进剪切位移的法向位移。在所有损伤函数中,损伤函数都与岩石节的塑性位移有关。我们将模型输出与在天然岩石节理上进行的直接剪切试验的结果进行了比较,并观察到了很好的一致性。

更新日期:2021-04-24
down
wechat
bug