Title: Testing and comparative analysis of dynamic and quasi-static compressive and tensile properties of hard coal

Authors: Xianjie Hao; Bingrui Chen; Guangyao Pan; Qian Zhang; Yulong Chen; Yingnan Wei

Addresses: Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China; State Key Laboratory of Water Resource Protection and Utilisation in Coal Mining, Beijing 100083, China; Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology), Huainan 232001, China; School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China ' School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China ' School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Abstract: The comparison of mechanical properties of hard coal under different conditions is important for the occurrence of coal mine dynamic disasters. This study adopted six tests, namely, the static tensile test, static tensile test, dynamic compressive test, dynamic tensile test, and coupled dynamic-static tensile and compression test, to analyse the relationship of the mechanical properties of coal under different conditions. The results show that, first the tensile strength of this type of hard coal under dynamic loading is 2-7 times higher than that under static loading. Second, the static tension-compression ratio is between 1/16 and 1/64, and the dynamic tension-compression ratio is between 1/2 and 1/40. The tension-compression ratio of coal is approximately three times higher under dynamic loading compared with that under static loading. Lastly, the dynamic strength increases with the axial static load within a certain range, but the dynamic strength of coal may decrease beyond this range. [Received: February 21, 2021; Accepted: October 15, 2022]

Keywords: coal; strength; tension-compression ratio; static loading; dynamic loading; coupled dynamic-static loading.

DOI: 10.1504/IJOGCT.2023.130380

International Journal of Oil, Gas and Coal Technology, 2023 Vol.33 No.1, pp.37 - 54

Accepted: 15 Oct 2022
Published online: 18 Apr 2023 *

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