梁为民, 信豪杰, 刘恒,等.动载后层理煤样微观孔径结构特征研究[J].河南理工大学学报（自然科学版）,2020,39(4):12-19.

LIANG W M, XIN H J, LIU H, et al.Study on the characteristics of micropore size structure of stratified coal samplesafter dynamic loading[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(4):12-19.

动载后层理煤样微观孔径结构特征研究

梁为民, 信豪杰, 刘恒, 岳高伟, 杨杰

河南理工大学 土木工程学院，河南焦作454000

摘要:为研究动载（冲击荷载作用）后煤样微观孔径结构变化规律及煤体结构异性对其微观孔径结构变化规律的影响，采用霍普金森试验系统（SHPB），对不同方向的煤样进行不同程度的冲击，并完成冲击前后煤样的低温液氮吸附试验，对比分析不同冲击荷载作用后的煤样微观孔径结构特征。结果表明：受冲击煤样的微小孔含量明显低于原煤样的，随着冲击荷载增大，微小孔含量逐渐减小；冲击荷载作用后，煤样微观孔径结构有从微孔向小孔，小孔向中大孔转化的趋势；随着冲击荷载增加，总孔容、比表面积和吸附量呈现逐渐减小的趋势，比表面积和吸附量与总孔容表现出较好的相关性；同种冲击荷载作用后，垂直层理方向煤样总孔容、比表面积以及吸附量均比平行层理方向的煤样高。

关键词:冲击荷载;霍普金森试验系统;低温氮吸附;结构异性;微观孔径结构

doi:10.16186/j.cnki.1673-9787.2020.4.2

基金项目:国家自然科学基金资助项目（41772163 ）

收稿日期:2019/11/22

修回日期:2020/01/16

出版日期: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