WANG C Y, WEI S J, ZHAI L W, et al.Experimental study on physical and mechanical properties of coal rock composite samples based on gypsum rock[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):36-44.

doi:10.16186/j.cnki.1673-9787.2021020019

Received:2021/02/06

Revised:2021/05/24

Published:2022/11/25

Experimental study on physical and mechanical properties of coal rock

composite samples based on gypsum rock

WANG Chongyang, WEI Sijiang, ZHAI Liwei, ZHANG Sheng

School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:To study the influence of rock height ratio index n on the physical and mechanical properties of coalrock composite samples，gypsum rock-like composite samples were used to study their uniaxial compression strength，triaxial compression strength and acoustic emission phenomenon in the process of experiment.The conclusions were as follows：The mechanical properties of the composite samples were closely related to the rock formation proportion coefficient n，and the uniaxial compressive strength and the triaxial compressive strength under different confining pressures increased with the increase of n.The larger n was，the larger the impact energy index of the combined sample is，and the more obvious the rockburst tendency was.With the decrease of the pores and“joints”in the sample，the acoustic emission characteristics of the samples tended to be“inactive”during triaxial compression.The failure of the compoite sample was related to the strength and proportion of each component sample.The lower the strength was and the larger the proportion of the component sample was，the more likely the failure was to occur.The research results could be used as a reference for understanding the instability mechanism and stability control of coal-rock combined pillar.

Key words:gypsum;coal rock compoite sample;mechanical propery;uniaxial compression;triaxial compression;acoustic emission

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