doi:10.16186/j.cnki.1673-9787.2020.4.2

Received:2019/11/22

Revised:2020/01/16

Published:2020/07/15

Study on the characteristics of micropore size structure of stratified coal samplesafter dynamic loading

LIANG Weimin, XIN Haojie, LIU Heng, YUE Gaowei, YANG Jie

School of Civil Engineering， Henan Polytechnic University ，Jiaozuo 454000 ， Henan， China

Abstract:In order to study the influence of the microstructure change law of coal sample and the structural anisotropy of coal mass on the microstructural change law after dynamic loading（impact loading） ， the Hopkinson experimental system （ SHPB） was used to impact the coal samples in different directions to different degrees. The low -temperature liquid nitrogen adsorption test of coal samples before and after impact loading， the microaperture structure characteristics of coal samples under different impact loads were compared and analyzed. The results showed that the micropore content of the impacted coal sample was significantly lower than that of the original coal sample， and the micropore content gradually decreased with the increase of the impact load. Under the impact loading， the microstructure of the coal sample had a tendency to transform from micropores to small pores and small pores to medium and large pores. With the increase of impact loading， the total pore volume， specific surface area and adsorption amount had a trend of decreasing gradually， and had a good correlation with the total pore volume. Under the same kind of impact loading， the total pore volume， specific surface areaand adsorption amount of the coal sample in the vertical bedding direction were higher than those in the parallel bedding direction.

Key words:impact loading;Hopkinson experimental system;low temperature nitrogen adsorption;structural;

动载后层理煤样微观孔径结构特征研究_梁为民.pdf