Experimental Analysis of the Mechanical Properties and Resistivity of Tectonic Coal Samples with Different Particle Sizes

Congyu Zhong, Liwen Cao, Jishi Geng, Zhihao Jiang and Shuai Zhang
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Congyu Zhong: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Liwen Cao: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Jishi Geng: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Zhihao Jiang: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Shuai Zhang: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2021, vol. 14, issue 8, 1-13

Abstract: Because of its weak cementation and abundant pores and cracks, it is difficult to obtain suitable samples of tectonic coal to test its mechanical properties. Therefore, the research and development of coalbed methane drilling and mining technology are restricted. In this study, tectonic coal samples are remodeled with different particle sizes to test the mechanical parameters and loading resistivity. The research results show that the particle size and gradation of tectonic coal significantly impact its uniaxial compressive strength and elastic modulus and affect changes in resistivity. As the converted particle size increases, the uniaxial compressive strength and elastic modulus decrease first and then tend to remain unchanged. The strength of the single-particle gradation coal sample decreases from 0.867 to 0.433 MPa and the elastic modulus decreases from 59.28 to 41.63 MPa with increasing particle size. The change in resistivity of the coal sample increases with increasing particle size, and the degree of resistivity variation decreases during the coal sample failure stage. In composite-particle gradation, the proportion of fine particles in the tectonic coal sample increases from 33% to 80%. Its strength and elastic modulus increase from 0.996 to 1.31 MPa and 83.96 to 125.4 MPa, respectively, and the resistivity change degree decreases. The proportion of medium particles or coarse particles increases, and the sample strength, elastic modulus, and resistivity changes all decrease.

Keywords: tectonic coal; particle size; gradation; mechanical properties; resistivity; particles (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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