EXPERIMENTAL RESEARCH ON DYNAMIC MECHANICAL CHARACTERISTICS OF LAYERED COMPOSITE COAL-ROCK

Shizhuo Zou; Li Wang; Jianmin  Wen; Xiaoling Wu; Yu Zhou

doi:10.1590/1679-78256721

EXPERIMENTAL RESEARCH ON DYNAMIC MECHANICAL CHARACTERISTICS OF LAYERED COMPOSITE COAL-ROCK

Authors

Shizhuo Zou Key Laboratory of Ministry for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China https://orcid.org/0000-0002-7701-4529
Li Wang PowerChina Road Bridge Group Co., Ltd., Beijing 100048, China https://orcid.org/0000-0001-9951-5386
Jianmin Wen Key Laboratory of Ministry for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China https://orcid.org/0000-0001-6921-5657
Xiaoling Wu Key Laboratory of Ministry for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China https://orcid.org/0000-0002-3481-5609
Yu Zhou Key Laboratory of Ministry for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China https://orcid.org/0000-0003-4247-299X

DOI:

https://doi.org/10.1590/1679-78256721

Abstract

USING THE SEPARATE HOPKINSON PRESSURE BAR TEST DEVICE, A SERIES OF DYNAMIC IMPACT TESTS WERE CARRIED OUT ON THE SINGLE COAL AND WHITE SANDSTONE NEAR THE INCIDENT BAR. WHEN THE STRESS WAVE PROPAGATES IN A COMPLEX WITH DIFFERENT WAVE IMPEDANCE MATCHING EFFECTS, ITS DYNAMIC MECHANICAL PROPERTIES CHANGE, ENERGY DISSIPATION LAW AND DAMAGE CHARACTERISTICS ARE STUDIED. THE RESEARCH RESULTS SHOW THAT: (1) WITH THE INCREASE OF IMPACT VELOCITY, THE PEAK STRESS AND DIF OF LAYERED COMPOSITE COAL-ROCK INCREASE LINEARLY. AT THE SAME SPEED, WHEN THE STRESS WAVE CHANGES FROM HARD TO SOFT, THE PEAK STRESS AND DIF ARE LARGER THAN THE STRESS WAVE FROM SOFT TO HARD. (2) THE DISSIPATED ENERGY DENSITY OF LAYERED COMPOSITE COAL-ROCK INCREASES IN A QUADRATIC FUNCTION WITH THE INCREASE OF THE INCIDENT ENERGY DENSITY, AND THE COMPOSITE BODY WITH BETTER WAVE IMPEDANCE MATCHING EFFECT HAS A HIGHER DISSIPATED ENERGY DENSITY. (3) THE FRACTAL DIMENSION AND THE DEGREE OF FRACTURE
OF LAYERED COMPOSITE COAL-ROCK INCREASE WITH THE INCREASE OF THE SPEED. THE WHITE SANDSTONE COMPONENT IS MOSTLY SHEAR FAILURE, AND THE COAL COMPONENT IS MOSTLY CRUSHED.

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Published

2021-10-13

Issue

Vol. 18 No. 8 (2021)

Section

Articles

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