摘要
煤体的孔隙特征及渗透率是影响注水减尘防突效果的重要因素,为了从孔隙角度揭示不同注水压力对煤体渗透率的影响。选取首山矿己15-12061工作面进行低压煤层注水现场实验,采用氮吸附法和压汞法分析各煤样微观及宏观孔隙特征,通过渗透率实验测得各煤样渗透参数。研究结果表明:煤的孔隙构成复杂,随着孔径增大,累计孔体积呈线性增大,累计孔面积呈对数型增大;压裂及延展微小裂隙效应使得低压注水能够增大煤体各孔径段孔隙量,但增幅不同;注水压力与各孔径段孔体积、比表面积呈正相关关系,各孔径段孔隙与渗透率呈线性正相关关系;注水对宏观孔隙影响更强烈,宏观孔隙对渗透率贡献相对较大。注水后的煤体孔隙系统连通性更好,渗透性能更强。
The pore characteristics and permeability of coal are the important factors affecting the effect of dust reduction and outburst prevention by water injection. In order to reveal the influence of different water injection pressures on the coal permeability in the perspective of pore,the field tests of low pressure water injection in the coal seam were carried out by selecting the Ji15-12061 working face of Shoushan mine. The micro and macro pore characteristics of each coal sample were analyzed by using the nitrogen adsorption method and the mercury intrusion method,and the permeability parameters of each coal sample were measured by the permeability tests. The results showed that the pore structure of coal was complex. With the increase of pore size,the cumulative pore volume increased linearly,and the cumulative pore area increased logarithmically.The effect of fracturing and extension of micro fractures enabled the low pressure water injection to increase the pore volume of each pore diameter section of coal,but the increase amplitude was different. The injection pressure had a positive correlation with the pore volume and specific surface area of each pore diameter section,and the pore volume of each pore diameter section had a linear positive correlation with the permeability. The influence of water injection on the macro pores was more intense,and the contribution of macro pores to the permeability was relatively larger. The pore system of coal had the better connectivity and stronger permeability after the water injection.
作者
王龙飞
蒋仲安
陈举师
张晋京
刘庆军
WANG Longfei;JIANG Zhongan;CHEN Jushi;ZHANG Jinjing;LIU Qingjun(School of Civil ＆ Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;China PingMei ShenMa Group,Pingdingshan Henan 467000,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2018年第6期108-113,共6页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(51604018)
关键词
低压煤层注水
孔隙特征
渗透率
氮气吸附
压汞法
low pressure water injection in coal seam
pore characteristics
permeability
nitrogen adsorption
mercury intrusion method
