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Experimental study on three-point-bending characteristics of hard and soft rock-like materials under different loading rates

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Abstract

Bending failure is a common failure mode of layered rock mass. Making clear the mechanical behaviors and energy evolution characteristics of layered rock mass, it is beneficial to prevent geological disasters caused by the bending deformation of layered rock mass. In this study, the mechanical behaviors and energy evolution characteristics of hard and soft rocks by conducting the three-point-bending (TPB) test with different loading rates were investigated. The results show that as the loading rate increases, both the peak load of hard and soft rock increases, the peak displacement of hard rock decreases, while the peak displacement of soft rock increases. The horizontal crack width at the bottom of the sample of hard rock is greater than that of soft rock, but the instantaneous crack widths show opposite results. Both the failure pattern of hard rock and soft rock are the typical tensile fracture, yet the fracture surface of hard rock is denser and smoother than that of soft rock. For hard rock, the total input energy, elastic energy, and dissipated energy increase with the increase of loading rate. For soft rock, however, the total input energy and elastic energy increases, while the dissipated energy decreases. Under the TPB test, the peak load, displacement, instantaneous crack width, total input energy, elastic energy, and dissipated energy of both hard rock and soft rock present linear relationships with the common logarithm of the loading rate.

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Funding

This work is supported by the National Natural Science Foundation of China (Nos. 41972297), and the Supporting program of hundred promising innovative talents in Hebei provincial education office (No. SLRC2019027).

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Authors and Affiliations

  1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin, 300401, China

    Da Huang, Yang Liu, Yunyun Yang, Zhao Li & Qiujie Meng

  2. College of Geology Engineering and Geomatics, Chang’an University, Xi’an, 710054, China

    Da Huang

Authors
  1. Da Huang
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  2. Yang Liu
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  3. Yunyun Yang
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  4. Zhao Li
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  5. Qiujie Meng
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Correspondence to Yang Liu.

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The authors declare that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Huang, D., Liu, Y., Yang, Y. et al. Experimental study on three-point-bending characteristics of hard and soft rock-like materials under different loading rates. Arab J Geosci 14, 1951 (2021). https://doi.org/10.1007/s12517-021-08284-9

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  • DOI: https://doi.org/10.1007/s12517-021-08284-9

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