孔隙压力对煤岩渗透率影响的试验研究

doi:10.16265/j.cnki.issn1003-3033.2017.03.014

中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (3): 77-82.doi: 10.16265/j.cnki.issn1003-3033.2017.03.014

孔隙压力对煤岩渗透率影响的试验研究

李波波^1,2,3 讲师, 杨康¹, 袁梅^1,2,3 教授, 许江⁴ 教授

1 贵州大学矿业学院,贵州贵阳 550025
2 贵州大学喀斯特山区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳 550025
3 贵州省非金属矿产资源综合利用重点实验室, 贵州贵阳 550025
4 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044

收稿日期:2016-10-28 修回日期:2017-01-04 发布日期:2020-11-22
作者简介:李波波 (1985—),男,贵州修文人,博士,讲师,主要从事煤层气渗流、矿井灾害防治等方面的教学与研究工作。E-mail:sbobo.0822@163.com。
基金资助:
国家科技重大专项项目(2016ZX05044);贵州省科学技术基金资助(黔科合J字[2015]2049号);贵州省科技厅、贵州大学联合资金计划项目(黔科合LH字[2014]7654);贵州大学引进人才科研项目(贵大人基合字(2014)57号)。

Experimental study on effect of pore pressure on permeability of coal

LI Bobo^1,2,3, YANG Kang ¹, YUAN Mei^1,2,3, XU Jiang⁴

1 College of Mining,Guizhou University,Guiyang Guizhou 550025,China
2 The National Joint Engineering Laboratory for the Utilization of Dominant Mineral Resources in Karst Mountain Area,Guizhou University,Guiyang Guizhou 550025,China
3 Guizhou Key Laboratory of Comprehensive Utilization ofNon-metallic Mineral Resources,Guiyang Guizhou 550025,China
4 State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University, Chongqing 400044,China

Received:2016-10-28 Revised:2017-01-04 Published:2020-11-22

摘要/Abstract

摘要： 为探索孔隙压力对煤岩渗透特性的影响和瓦斯运移规律,以贵州六盘水矿区的煤样为研究对象,利用自带能量扩散X射线(EDX)扫描电镜(SEM)、比表面微孔分析仪,分析煤岩的孔隙特征,同时利用自主加工的三轴渗流装置,进行不同压差下孔隙压力变化的渗流试验研究。结果表明,煤岩孔隙特征、氮气吸附量与孔裂隙发育程度成正相关关系,且与孔径的孔连通率有关。压差一定时,随着孔隙压力增加,煤岩渗透率下降,呈指数函数规律;压差小时,煤岩渗透率的减小率随孔隙压力的增大而减小。煤岩渗透率随试件两端压差的增大呈指数函数减小。

关键词: 煤岩; 孔隙压力; 有效应力; 渗透率; 压差

Abstract: In order to study influence of pore pressure on permeability of coal and gas migration law, pore characteristics of samples of two kinds of coal taken from Liupanshui mining area were studied by using a scanning electron microscope (SEM) with energy dispersive X-ray (EDX) and a specific surface area and micropore analyzer,and seepage experiments were carried out on the samples by using an independently developed traixial seepage device. The results show that the pore characteristics of coal and the amount of nitrogen adsorption are positively correlated with the pore fissure development degree, and also related to the pore connectivity,that when the pressure difference is constant, the permeability of coal decreases exponentially with the pore pressure, and when the pressure difference is small, the decrease rate of permeability decreases with the increase of pore pressure,and that the permeability of coal decreases exponentially with the increase of pressure difference between the two ends of the specimen.

Key words: coal, pore pressure, effective stress, permeability, pressure difference

中图分类号:

X936

李波波, 杨康, 袁梅, 许江. 孔隙压力对煤岩渗透率影响的试验研究[J]. 中国安全科学学报, 2017, 27(3): 77-82.

LI Bobo, YANG Kang , YUAN Mei, XU Jiang. Experimental study on effect of pore pressure on permeability of coal[J]. China Safety Science Journal, 2017, 27(3): 77-82.

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孔隙压力对煤岩渗透率影响的试验研究

Experimental study on effect of pore pressure on permeability of coal

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