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[1]孙光中,等.含瓦斯构造煤卸围压作用渗透性变化特征试验研究[J].中国安全生产科学技术,2016,12(7):65-70.[doi:10.11731/j.issn.1673-193x.2016.07.012]
 SUN Guangzhong,TIAN Kunyun,ZHANG Ruilin.Experimental study on characteristics of permeability variation for tectonic coal containing gas under unloading confining pressure[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2016,12(7):65-70.[doi:10.11731/j.issn.1673-193x.2016.07.012]
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含瓦斯构造煤卸围压作用渗透性变化特征试验研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
12
期数:
2016年7期
页码:
65-70
栏目:
现代职业安全卫生管理与技术
出版日期:
2016-07-30

文章信息/Info

Title:
Experimental study on characteristics of permeability variation for tectonic coal containing gas under unloading confining pressure
作者:
孙光中12田坤云12张瑞林12
(1. 河南工程学院 安全工程学院,河南 郑州 451191;2.河南省煤矿安全重点实验室培养基地,河南 郑州 451191)
Author(s):
SUN Guangzhong12 TIAN Kunyun12 ZHANG Ruilin12
(1. School of Safety Engineering, Henan University of Engineering, Zhengzhou Henan 451191, China; 2. Key Laboratory of Coal Mine Safety Training Base in Henan province, Zhengzhou Henan 451191, China)
关键词:
含瓦斯煤卸围压渗流特性试验研究
Keywords:
coal containing gas unloading confining pressure characteristics of permeability experimental study
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2016.07.012
文献标志码:
A
摘要:
针对含瓦斯煤轴压恒定卸围压渗透性演化规律,以新登煤业二1煤原煤样为研究 对象,利用自主研发的含瓦斯煤岩三轴应力蠕变渗流试验装置,开展不同围压下轴向应 力恒定卸围压渗流测试试验。基于实验结果表明:构造煤在应力加载阶段渗透率降低, 且轴压围压同时加载,渗透率变化与轴向应变符合线性变化,轴压加载阶段,渗透率与 轴向应变符合负指数函数变化规律;围压卸载阶段,渗透率在卸围压过程中一直减小, 随着轴向应变的增加,渗透率出现反弹,但未出现突变现象,渗透率增加阶段与时间变 化符合退化的负指数函数关系;构造煤渗透率卸围压失稳后,渗透率没有出现突变原因 认为煤样中没有形成较大的有效渗流通道,且在一定的有效应力作用下瓦斯渗流的有效 通道出现自愈合现象。
Abstract:
Aiming at the evolution regulations of permeability for coal containing gas under unloading confining pressure with constant axial pressure, taking the raw coal samples二1 coal in Xindeng Coal Industry as the research object, the test experiments on seepage during unloading different confining pressure with constant axial pressure were carried out by using the self-developed experimental apparatus on three axis stress creep seepage for coal containing gas. The results showed that the permeability of tectonic coal in the stress loading stage decreases, and when loading the axial pressure and confining pressure simultaneously, the change of permeability accords with linear change against axial strain. In the stage of loading axial pressure, the permeability accords with the change law of negative exponential function against axial strain. In the stage of unloading confining pressure, the permeability always decreases in the process of unloading confining pressure. With the increase of axial strain, the permeability rebounds, but without mutation phenomenon, and the permeability in the increasing period accords with the degraded negative exponential function against time. After the instability of tectonic coal under unloading confining pressure, the reasons of without mutation for permeability is that larger effective seepage channels have not been formed in the coal samples, and the self-healing phenomenon has appeared in effective channels of gas seepage under the effect of certain effective stress.

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备注/Memo

备注/Memo:
国家自然科学基金项目(51174082);河南省重点科技攻关项目 (132102210485);河南省高等学校重点科研项目(17A440002)
更新日期/Last Update: 2016-08-04