Dynamic Tensile Strength of Coal under Dry and Saturated Conditions

Yixin Zhao, Shimin Liu, Yaodong Jiang, Kai Wang, Yaqiong Huang

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

The tensile failure characterization of dry and saturated coals under different impact loading conditions was experimentally investigated using a Split Hopkinson pressure bar. Indirect dynamic Brazilian disc tension tests for coals were carried out. The indirect tensile strengths for different bedding angles under different impact velocities, strain rates and loading rates are analyzed and discussed. A high-speed high-resolution digital camera was employed to capture and record the dynamic failure process of coal specimens. Based on the experimental results, it was found that the saturated specimens have stronger loading rate dependence than the dry specimens. The bedding angle has a smaller effect on the dynamic indirect tensile strength compared to the impact velocity. Both shear and tensile failures were observed in the tested coal specimens. Saturated coal specimens have higher indirect tensile strength than dry ones.

Original languageEnglish (US)
Pages (from-to)1709-1720
Number of pages12
JournalRock Mechanics and Rock Engineering
Volume49
Issue number5
DOIs
StatePublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Geology

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