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Experimental and numerical study on loading rate effects of rock-like material specimens containing two unparallel fissures

  • Geological, Civil, Energy and Traffic Engineering
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Abstract

A series of laboratory experiments and PFC numerical simulations for rock-like material specimens containing two unparallel fissures were carried out. On the basis of experimental and numerical results, the stress-strain curves, mechanical properties, AE events, cracking behavior and energy characteristics were analyzed to reveal the macro-mechanical behavior and meso-mechanism of pre-fissured specimens under different loading rates. Investigated results show that: 1) When the loading rate is relatively low, the stress-strain curves show a brittle response. When the loading rate is relatively high, the curve shows a more ductile response. Both of the peak strength and elastic mudulus increase with the increase of loading rate, which can be expressed as power functions. 2) Four crack types are identified, i.e., tensile crack, shear crack, far-field crack and surface spalling. Moreover, the tensile crack, far-field crack and surface spalling are under tensile mechanism, while the shear crack is under shear mechanism. 3) The drops of the stress-strain curves all correspond to the crack initiation or coalescence, which is also linked to a sudden increasing in the accumulated micro-crack curve. 4) Both of the maximum bond force and energy have the similar trend with the increase of loading rate to peak strength, which indicates that the trend of peak strength can be explained by the meso-mechanics and energy.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Yan-hua Huang  (黄彦华), Sheng-qi Yang  (杨圣奇) & Wei Zeng  (曾卫)

Authors
  1. Yan-hua Huang  (黄彦华)
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  2. Sheng-qi Yang  (杨圣奇)
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  3. Wei Zeng  (曾卫)
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Corresponding author

Correspondence to Sheng-qi Yang  (杨圣奇).

Additional information

Foundation item: Project (BK20150005) supported by the Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars, China; Project (2014YC10) supported by the Fundamental Research Funds for the Central Universities, China

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Huang, Yh., Yang, Sq. & Zeng, W. Experimental and numerical study on loading rate effects of rock-like material specimens containing two unparallel fissures. J. Cent. South Univ. 23, 1474–1485 (2016). https://doi.org/10.1007/s11771-016-3200-3

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  • DOI: https://doi.org/10.1007/s11771-016-3200-3

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