新景矿3号煤层渗透率对有效应力敏感性实验分析  

Experimental Analysis of Effective Stress Sensitivity of 3~# Coal Seam Permeability in Xinjing Mine

作　　者：谢玉华 赵坤 刘见宝 张建锋 杨昌永 XIE Yuhua;ZHAO Kun;LIU Jianbao;ZHANG Jianfeng;YANG Changyong(School of Resource and Environment,Henan University of Engineering,Zhengzhou 451191,China;Henan Engineering Laboratory of Comprehensive Treatment Technology of Environmental Geological Disaster in Coal Mine,Zhengzhou 451191,China;School of Civil Environment,Henan University of Engineering,Zhengzhou 451191,China;Henan Polytechnic University,Jiaozuo 454000,China;State Key Laboratory of Coal and CBM Co-mining,Jincheng 048000,China)

机构地区：[1]河南工程学院资源与环境学院,河南郑州451191 [2]煤矿环境地质灾害综合治理技术河南省工程实验室,河南郑州451191 [3]河南工程学院土木工程学院,河南郑州451191 [4]河南理工大学,河南焦作454000 [5]煤与煤层气共采国家重点实验室,山西晋城048000

出　　处：《煤矿安全》2020年第4期36-41,共6页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41872169);中国博士后科学基金资助项目(2018M642747);河南工程学院博士基金资助项目(D2015012)。

摘　　要：利用KDZS-Ⅱ型煤体瓦斯瞬时解吸及渗流特性测试仪在0.31、0.61 MPa气体压力条件下,开展了新景矿3号煤层渗透率对有效应力敏感性实验分析。结果表明:新景矿3号煤层渗透率对有效应力具有极强的敏感性,煤层渗透率随有效应力增加而降低,二者之间具有良好的负指数幂函数关系;相同气体压力和有效应力下各煤样试件的渗透率变化不同且分异现象显著;煤样试件的渗透率大小与孔隙度、裂隙方向密切相关,煤样试件裂隙方向平行于轴线方向、孔隙度大时,煤样试件的渗透率相对较大;煤样试件的裂隙方向垂直于轴线方向、孔隙度较小时,煤样试件的渗透率相对较小。The KDZS-Ⅱ type coal body gas instantaneous desorption and seepage characteristic tester was used to analyze the effective stress sensitivity of 3~# coal seam in Xinjing Mine under the gas pressure conditions of 0.31 MPa and 0.61 MPa. The results show that the permeability of 3~# coal seam in Xinjing Mine is extremely sensitive to effective stress, and the permeability of coal seam decreases with the increase of effective stress, and there is a good negative exponential power function relationship between them. The permeability changes of different coal sample specimens under the same gas pressure and effective stress are different and the differentiation phenomenon is significant. The permeability of the coal sample specimens is closely related to the porosity and fracture direction. When the fracture direction of the coal sample specimens is parallel to the axial direction and the porosity is large, the permeability of the coal sample specimens is relatively large. When the fracture direction of the coal sample specimens is perpendicular to the axial direction and the porosity is small, the permeability of the coal sample specimens is relatively small.

关 键 词：煤层渗透率 有效应力 应力敏感性 气体压力 MT 223-1990 

分 类 号：TD712[矿业工程—矿井通风与安全]