Fracture mechanism of coal-rock combination under 
unilateral confinement compression

PENG Yang; GAO Yong-tao; WANG Wen-lin; FUER Kate; WEN Jian-min; ZHOU Yu

doi:10.16285/j.rsm.2021.0797

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Fracture mechanism of coal-rock combination under unilateral confinement compression

更新时间：2026-06-25

- Fracture mechanism of coal-rock combination under unilateral confinement compression
- Vol. 44, Issue S1, Pages: 387-398(2023)
- 作者机构：
  
  1. 北京科技大学金属矿山高效开采与安全教育部重点实验室,北京,100083
  2. 陕西华彬煤业股份有限公司,陕西,咸阳,713500
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0797
  CLC： TD313
- Online First：19 November 2023，
  
  Published：2023
- 稿件说明：
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PENG Yang, GAO Yong-tao, WANG Wen-lin, et al. Fracture mechanism of coal-rock combination under unilateral confinement compression[J]. 2023, 44(S1): 387-398.
DOI：

PENG Yang, GAO Yong-tao, WANG Wen-lin, et al. Fracture mechanism of coal-rock combination under unilateral confinement compression[J]. 2023, 44(S1): 387-398. DOI： 10.16285/j.rsm.2021.0797.

摘要

对深部煤层与周围岩体组成煤−岩系统的研究已成为深部开采的热门研究方向之一。借助L型模具开展岩−煤−岩组合体单侧限压缩试验，结合数字图像相关（digital image correlation，DIC）技术及颗粒流PFC2D的计算数据分析单侧限压缩煤-岩组合体的试验强度、破坏特征及裂纹分布等规律。研究表明：（1）单侧限压缩煤岩组合体的主应变集中区域均处于试样煤层的临空侧。（2）单侧限压缩下两端岩层对煤层的共同约束随着煤层高宽比增大而减小，试样破坏由煤层临空面中部逐渐转移到煤层的端部。（3）单侧限压缩下组合体岩煤岩比例为1∶1∶1和1∶2∶1时，计算模型的破坏形态在煤层中部呈<状破裂，表现在临空面一侧。岩煤岩比例为1∶4∶1时，宏观破坏逐渐转移到煤层中上部，渐渐演变为剪切破坏。（4）计算模型微观裂纹主要位于临空面一侧，表现为张拉型裂纹，模型内部的张拉型裂纹数目是剪切型裂纹的4.5倍左右。

Abstract

The research of the coal-rock system composed of deep coal seams and surrounding rock masses has become one of the popular research directions in deep mining. In this study

the L-shaped mold is used to carry out the unilateral confinement compression test on the rock-coal-rock combination

and the digital image correlation technology (DIC) and the particle flow PFC2D are used to analyze the test strength

failure characteristics and crack distribution of the coal-rock combination. (1) The main strain areas of coal-rock combination are all concentrated on the free side of the sample coal seam. (2) Under unilateral confinement

the joint restriction of the two rock layers on the coal seam decreases as the height-to-width ratio of the coal seam increases. The damage of the sample is gradually transferred from the middle of the coal seam to the end of the coal seam. (3) When the ratio of coal-rock combination is 1:1:1 and 1:2:1

the failure mode of the calculation model shows a <-shaped fracture

which appears on the free side in the middle of the coal seam. When the rock-to-rock ratio is 1:4:1

the macroscopic damage gradually shifts to the middle and upper part of the coal seam

and evolves into shear failure. (4) The microscopic cracks of the calculation model are mainly located on the free side

which appear as tensile cracks. The number of the tensile cracks inside the model are about 4.5 times that of the shear cracks.

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