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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression
GUO Yu-xia(郭育霞)1, 2, ZHAO Yong-hui(赵永辉)1, 2, WANG Sheng-wei(王胜伟)1, 2, FENG Guo-rui(冯国瑞)1, 2, ZHANG Yu-jiang(张玉江)1, 2, RAN Hong-yu(冉洪宇)1, 2

1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Province Research Centre of Green Mining Engineering Technology, Taiyuan 030024, China

Abstract:Residual coal pillars play an important role in mining the adjacent coal seam safely, managing the gobs and maintaining the stability of abandoned coal mines. The height to diameter ratio (H/D) affects the stability of residual coal pillars. In this study, uniaxial compressive tests of coal specimens with five H/D (2.0, 1.5, 1.0, 0.8 and 0.6) were performed, and the stress, strain and acoustic emission (AE) were monitored. Results show that the uniaxial compressive strength (UCS) and peak strain increase with H/D decreasing. An empirical equation is proposed to calculate the UCS based on the H/D. The AE activities during coal failure process can be separated into four periods. The span of quiet period and rapid decline period shorten with H/D decreasing. The smaller the H/D is, the more complicated the failure characteristics of coal will be. The failure form of coal with H/D of 2.0, 1.5, and 1.0 is primarily shear failure, while splitting failure along the axial direction is the mainly mode when H/D is 0.8 or 0.6. The initiation, expansion, aggregation and connection of micro-cracks can be reflected by the real-time spatial evolution of AE event points.

 

Key words: residual coal pillar; height to diameter ratio; uniaxial compression; acoustic emission; micro-crack evolution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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