Study on the Dynamic Mechanical Properties of Layered Coal Under Three-dimensional Static Loading
To investigate the dynamic mechanical behavior of layered coal samples(0°,45°,90°)under different three-di-mensional stress(axial pressure of 2.70 MPa and confining pressure of 5.04 MPa;axial pressure of 13.50 MPa and confi-ning pressure of 12.60 MPa),an improved active triaxial Split-Hopkinson Pressure Bar(SHPB)experimental system was used to conduct dynamic triaxial impact experiments of layered coal samples.The effects of different bedding angle on the dynamic mechanical properties and energy dissipation characteristics of coal sample were analyzed under three-dimensional stress.The results indicate that with the increase of three-dimensional stress,the dynamic compressive strength and dynamic elastic modulus of the coal sample increase,and the energy absorption rate of coal sample is positively correlated with the en-ergy dissipation density.With the increase of bedding angle,both the dynamic compressive strength and elastic modulus of the coal samples exhibit a V-shaped distribution that decrease first and then increase,and both are the minimum value when the bedding angle is 45°.In contrast,the energy absorption rate and energy dissipation density increase first and then decrease in an inverted V-shaped distribution,reaching the maximum value when the bedding angle is 45°.The mechanical properties and energy dissipation rules obtained from the experiments can provide theoretical support for the safe and efficient extraction of coal.
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