Choosing a proper loading rate for bonded-particle model of intact rock

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• 作者：Xiao-Ping Zhang ; Louis Ngai Yuen Wong
• 关键词：Bonded ; particle model (BPM) ; Rock ; Loading rate ; Step strain rate ; Time step
• 刊名：International Journal of Fracture
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：189
• 期：2
• 页码：163-179
• 全文大小：4,809 KB
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• 作者单位：Xiao-Ping Zhang (1)
  Louis Ngai Yuen Wong (2)
  
  1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
  2. School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, Nanyang Avenue, Singapore, 639798, Singapore
  
• ISSN：1573-2673

文摘

Bonded-particle model (BPM) is widely used to model geomaterials, in which calibration against the results from uniaxial/triaxial compressive tests, Brazilian tensile tests and shear tests have been commonly conducted. However, since different loading rates were used, it is difficult to assess the numerical results of these studies if the effects of the loading rate are ignored. This paper discusses the loading mechanisms associated with different loading rates in the BPM and examines the numerical outputs under these different rates. The results indicate that the time step is an important factor controlling the loading rate of the BPM and should be considered in addition to the velocity of the loading platen. The strain rate, which is usually employed to describe the loading rate in a physical test, cannot be used for the direct comparison of different numerical tests in \(\hbox {PFC}^{\mathrm{2D}}\) due to the time step. A proposed “step strain rate- which considers the time step, is found to be more appropriate for comparing the loading velocity on specimens of varying sizes. Six different loading rates (0.005, 0.01, 0.02, 0.08, 0.2 and 0.6?m/s) are employed in uniaxial compressive tests and Brazilian tests during this study. After comprehensive examinations, a maximum step strain rate of \(1.1 \times 10^{-8}\, \hbox {step}^{-1}\) is considered to be appropriate for quasi-static uniaxial compressive tests and Brazilian tests using the BPM.