摘要
以陕北榆林矿区主采2#煤层为背景,采用扫描电子显微镜测试和分形理论分析方法,通过制样、烘干、测试、分析等过程,获得了对煤样裂隙尺度和分形特征。经测试,陕北榆林矿区主采煤层煤样裂隙呈现不规则分布,细微分支裂隙主要依附较大主裂隙而衍生,主裂隙宽度在90~617μm,分支细微裂隙宽度在0~21μm;采用盒子计数法分析了表面裂隙的分形特征,得到了不同分形尺度下裂隙条数,并利用最小二乘法对裂隙数量N(δ)和网格边长δ进行回归分析,获得了陕北榆林矿区主采煤层煤体裂隙分析维数在1.0115~1.5082,裂隙复杂程度一般。依据相关标准,初步判定该地区煤层导水性属于Ⅳ类或Ⅴ类,煤层煤体导水性较差,水渗难度较大,为后期开展煤层注水润湿范围预测及降尘工程应用提供基础支撑。
Based on the background of the No.2 coal seam mainly mined in Yulin mining area in northern Shaanxi,adopts scanning electron microscope testing and fractal theory analysis methods,and obtains the fracture size and fractal characteristics of coal samples through the process of sample preparation drying testing analysis.After testing,the cracks in the main coal seam samples in the Yulin mining area in northern Shaanxi show irregular distribution,with small branch cracks mainly derived from larger main cracks,and the width and size range of the main cracks are within 90-617滋m,the width range of branch fine cracks is 0-21μm.The box counting method was used to analyze the fractal characteristics of surface cracks,and the number of cracks at different fractal scales was obtained.The least squares method was used to calculate the number of cracks N(δ)and grid edge length啄through regression analysis,it was found that the analysis dimensions of coal seam fractures in the main mining seam of Yulin mining area in northern Shaanxi are between 1.0115 and 1.5082.Based on relevant standards,it is preliminarily determined that the water conductivity of the coal seams in this area belongs to class IV or class V,the water conductivity of coal seams is poor,and the difficulty of water permeability is high.This can provide basic support for the application of water injection dust reduction programs in the future.
作者
陈芳
CHEN Fang(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China)
出处
《煤炭技术》
CAS
2024年第12期276-280,共5页
Coal Technology
基金
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1184)
国家重点研发计划项目(2022YFB4703603)。
关键词
扫描电镜
分形理论
裂隙尺度
盒子计数法
分形维数
scanning electron microscopy
fractal theory
crack scale
box-counting method
fractal dimension
作者简介
陈芳(1986-),陕西镇巴人,副研究员,博士研究生,研究方向:煤矿粉尘防治技术,电子信箱:my-cafe@163.com。
