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Modeling shear behavior of rock joints: A focus on interaction of influencing parameters
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijrmms.2020.104449
Nima Babanouri , Mostafa Asadizadeh , Zahra Hasan-Alizade

Abstract One of the principal issues in the design of surface and underground structures on/in rock is the shear behavior of rock discontinuities that irreparable damages are caused when neglecting it. Several parameters are involved in the shear behavior of rock discontinuities which can interact with each other. The purpose of this study is to model the shear behavior of rock joints with regard to the individual impact of the influencing parameters and their interaction. To do so, a number of direct shear tests was performed where the values of independent parameters including the compressive strength (σc), normal stress (σn), modulus of elasticity (E), joint roughness coefficient (JRC) and basic friction angle (ϕb) were varied. Then, the response surface methodology (RSM) was used to incorporate the individual influence and interaction of the parameters into constitutive relationships for the peak shear strength, peak shear displacement, and dilation angle. For the shear strength, the most significant interaction was found to be between E and ϕb, for the peak shear displacement between JRC and E, and for the dilation angle between σc and E. The results show that the proposed model performs better in estimating the shear behavior characteristics than the model obtained from the nonlinear regression and the Barton-Bandis model. Therefore, the application of RSM is a winning approach for modeling the rock shear behavior which is capable of modeling the most complex interactions and provides a reliable performance.

中文翻译:

模拟岩石节理的剪切行为:关注影响参数的相互作用

摘要 岩石上/内地表和地下结构设计的主要问题之一是岩石不连续性的剪切行为,忽视它会造成不可修复的损坏。岩石不连续性的剪切行为涉及多个参数,这些参数可以相互影响。本研究的目的是模拟岩石节理在影响参数及其相互作用的个体影响方面的剪切行为。为此,进行了许多直接剪切试验,其中独立参数的值包括压缩强度 (σc)、法向应力 (σn)、弹性模量 (E)、接头粗糙度系数 (JRC) 和基本摩擦角 ( ϕb) 变化。然后,响应面方法 (RSM) 用于将参数的个体影响和相互作用纳入峰值剪切强度、峰值剪切位移和膨胀角的本构关系。对于剪切强度,发现最显着的相互作用是 E 和 ϕb 之间、JRC 和 E 之间的峰值剪切位移以及 σc 和 E 之间的膨胀角。 结果表明,所提出的模型在估计剪切行为特征与从非线性回归和 Barton-Bandis 模型获得的模型相比。因此,RSM 的应用是模拟岩石剪切行为的一种成功方法,它能够模拟最复杂的相互作用并提供可靠的性能。
更新日期:2020-10-01
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