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Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression

不同高径比煤岩单轴压缩破坏过程的应力-应变-声发射响应

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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.

摘要

遗留煤柱在相邻煤层安全开采, 采空区管理和维护废弃矿井稳定性等方面发挥着重要作用。高径比影响着遗留煤柱的稳定性。本文对5 种高径比(2.0, 1.5, 1.0, 0.8 和0.6)的煤样进行了单轴压缩试验, 并对应力, 应变和声发射进行了监测。结果表明, 随着高径比的减小, 煤样的单轴抗压强度和峰值应变均增大。提出了一个用以描述单轴抗压强度和高径比关系的经验方程。煤样破坏过程中的声发射活动可被划分为四个时期, 静默期和快速衰弱期的时长与高径比呈正相关。高径比越小, 煤样的破坏特征越复杂, 当高径比为2.0, 1.5, 1.0 时, 破坏形式以剪切破坏为主, 而当高径比为0.8, 0.6 时, 破坏形式以轴向劈裂破坏为主。声发射事件点的实时空间演化可以反映微裂隙的萌生, 扩展, 聚集和联通。

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Authors and Affiliations

  1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Yu-xia Guo  (郭育霞), Yong-hui Zhao  (赵永辉), Sheng-wei Wang  (王胜伟), Guo-rui Feng  (冯国瑞), Yu-jiang Zhang  (张玉江) & Hong-yu Ran  (冉洪宇)

  2. Shanxi Province Research Centre of Green Mining Engineering Technology, Taiyuan, 030024, China

    Yu-xia Guo  (郭育霞), Yong-hui Zhao  (赵永辉), Sheng-wei Wang  (王胜伟), Guo-rui Feng  (冯国瑞), Yu-jiang Zhang  (张玉江) & Hong-yu Ran  (冉洪宇)

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  1. Yu-xia Guo  (郭育霞)
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  2. Yong-hui Zhao  (赵永辉)
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Correspondence to Guo-rui Feng  (冯国瑞) or Yu-jiang Zhang  (张玉江).

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Foundation item

Projects(51974192, 52004172) supported by the National Natural Science Foundation of China; Project(51925402) supported by the Distinguished Youth Funds of National Natural Science Foundation of China; Project(U1710258) supported by the Joint Funds of National Natural Science Foundation of China and Shanxi Province, China

Contributors

The overarching research goals were developed by GUO Yu-xia, FENG Guo-rui and ZHAO Yong-hui. ZHAO Yong-hui and GUO Yu-xia did experiment and analyzed the experimental data. The initial draft of the manuscript was written by GUO Yu-xia and ZHAO Yong-hui. WANG Sheng-wei, ZHANG yu-jiang, FENG guo-rui, RAN Hong-yu revised the original manuscript. All the authors replied to the reviewers’ comments and revised the final version.

Conflict of interest

GUO Yu-xia, ZHAO Yong-hui, WANG Sheng-wei, ZHANG yu-jiang, FENG Guo-rui and RAN Hong-yu declare that they have no conflict of interest.

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Guo, Yx., Zhao, Yh., Wang, Sw. et al. Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression. J. Cent. South Univ. 28, 1724–1736 (2021). https://doi.org/10.1007/s11771-021-4729-3

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