Dynamic mechanical properties of structural anisotropic coal under low and medium strain rates

The static mechanical properties of coal rock show anisotropism, which makes the permeability have anisotropic characteristics partly. The dynamic impact mechanical characteristics of structural anisotropic coal under low and medium strain rates were studied by using self-made vertical Split Hopkins...

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Bibliographic Details
Published in:PloS one 2020-08, Vol.15 (8), p.e0236802-e0236802
Main Authors: Li, Minmin, Liang, Weimin, Yue, Gaowei, Zheng, Xinjun, Liu, Heng
Format: Article
Language:English
Subjects:
Anisotropy
Bedding
Civil engineering
Coal
Coal mining
Core analysis
Coring
Dynamic mechanical properties
Elastic anisotropy
Engineering and Technology
Failure analysis
Gas seepage
Geological research
Impact loads
Load
Load distribution
Mechanical properties
Permeability
Physical Sciences
Researchers
Seepage
Storage modulus
Strain
Strain rate
Stress
Studies
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Summary:The static mechanical properties of coal rock show anisotropism, which makes the permeability have anisotropic characteristics partly. The dynamic impact mechanical characteristics of structural anisotropic coal under low and medium strain rates were studied by using self-made vertical Split Hopkinson Bar (SHPB) equipment. The peak stress, the strain rate, dynamic elastic modulus and failure characteristics of raw coal with three coring directions were analyzed under the influence of five impact loads and structural anisotropy. The peak stress increases linearly with impact load, and the maximum strain rate and the dynamic elastic modulus increase exponentially with impact load. The coal samples display anisotropic mechanical characteristics. The values of maximum strain rate, peak stress and dynamic elastic modulus are ranked with directions by the perpendicular to bedding direction (Z direction), the parallel to bedding direction (X direction), and the oblique 45° to bedding direction (Y direction). Dynamic mechanical properties of structural anisotropic coal provide a theoretical basis for gas seepage in far-blasting field.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0236802