Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading

WANG Chen-lin; ZHANG Xiao-dong; DU Zhi-gang

doi:10.16285/j.rsm.2018.1187

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Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading

更新时间：2026-06-25

- Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading
- Vol. 40, Issue 6, Pages: 2140-2153(2019)
- 作者机构：
  
  1. 河南理工大学能源科学与工程学院,河南,焦作,454000
  2. 河南理工大学中原经济区煤层气（页岩气）协同创新中心,河南,焦作,454000
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.1187
  CLC： TU457
- Online First：20 June 2019，
  
  Published：2019
- 稿件说明：
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WANG Chen-lin, ZHANG Xiao-dong, DU Zhi-gang. Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading[J]. 2019, 40(6): 2140-2153.
DOI：

WANG Chen-lin, ZHANG Xiao-dong, DU Zhi-gang. Experimental study of the permeability of coal specimen with pre-existing fissure under cyclic loading and unloading[J]. 2019, 40(6): 2140-2153. DOI： 10.16285/j.rsm.2018.1187.

摘要

应用三轴加载煤岩渗流试验装置，对预制贯通裂隙煤样开展循环加卸载轴压渗透率试验，分析循环加卸载轴压作用下预制裂隙煤样渗透率的变化规律及其之间的差异。研究结果表明：预制裂隙煤样渗透率与轴压呈负指数函数关系，渗透率对应力敏感性随加卸载次数增加而降低。加载阶段渗透率差值与卸载阶段渗透率差值随加卸载次数增加而降低，渗透率差值与应力敏感性系数呈正相关性。加载阶段与卸载阶段渗透率存在明显差值，渗透率产生明显损失量，其随加卸载次数增加而降低。竖直裂隙煤样渗透率与应力敏感性系数明显高于水平裂隙煤样与完整煤样，水平裂隙煤样渗透性与完整煤样渗透性相差不大，但水平裂隙煤样应力敏感性系数高于完整煤样。竖直裂隙煤样渗透率差值与渗透率损失量明显高于水平裂隙煤样与完整煤样，水平裂隙煤样渗透率差值高于完整煤样，但两者渗透率损失量相差不大。循环加卸载轴压结束后，完整煤样渗透率损失率最大，水平裂隙煤样渗透率损失率居中，竖直裂隙煤样渗透率损失率最小；竖直裂隙煤样渗透率恢复率最大，水平裂隙煤样渗透率恢复率居中，完整煤样渗透率恢复率最小。

Abstract

The cyclic loading and unloading axial compression tests of coal specimens with the pre-existing transfixion fissure were carried out by triaxial loading coal rock seepage testing device. The permeability variation of coal specimen with pre-existing fissure and the difference with permeability of intact coal specimen were analyzed. The results show that the relationship between permeability and axial compression is a negative exponential function and the stress sensitivity of permeability decreases with the increase of the loading and unloading numbers for coal with pre-existing fissure. The permeability difference of the loading stage and permeability difference of unloading stage decrease with the increase of the loading and unloading numbers. There is a positive correlation between permeability difference and stress sensitivity coefficient. There exists a significant permeability difference during the loading and unloading stage

which indicates that there is apparent loss in permeability and it decreases with the increase of the loading and unloading numbers. The permeability and stress sensitivity coefficient of coal specimens with vertical fissure are higher than those of the coal specimens with horizontal fissure and the intact coal specimens. The permeability of coal specimen with horizontal fissure is similar to that of the intact coal specimen

but the stress sensitivity coefficient is higher than that of the intact coal specimen. The permeability difference and the loss quantity of permeability of coal specimens with vertical fissure are higher than those of the coal specimens with horizontal fissure and intact coal specimens. The permeability difference of coal specimens with horizontal fissure is higher than that of the intact coal specimens

but there is slight difference in the loss quantity of permeability between them. After the cyclic loading and unloading axial compression

the loss rate of permeability is the largest for intact coal specimen

followed by the coal specimen with horizontal fissure and last is the coal specimen with vertical fissure. The recovery rate of permeability is the largest for the coal specimen with vertical fissure

followed by the coal sample with horizontal fissure

and last is the intact coal sample.

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