魏国营, 王泽华, 贾天让.三轴压缩蠕变条件下煤岩裂隙演化规律试验研究[J].河南理工大学学报（自然科学版）,2020,39(2):15-21.

WEI G Y, WANG Z H, JIA T R.Experimental study on evolution law of coal-rock fracture under triaxial compression creep[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(2):15-21.

三轴压缩蠕变条件下煤岩裂隙演化规律试验研究

魏国营1,2, 王泽华1, 贾天让1,2

1.河南理工大学安全科学与工程学院，河南焦作 454000;2.河南省瓦斯地质与瓦斯治理重点实验室，省部共建国家重点实验室培育基 地，河南 焦作 454000

摘要:为了研究蠕变条件下煤体内部裂隙演化规律对其渗透率和瓦斯抽采效率的影响，本文以焦作赵固二矿原煤为研究对象，采用三轴压缩蠕变试验及工业CT扫描技术，运用MATLAB软件对图像进行均衡化二值处理，研究不同载荷条件下煤样内部裂隙的分布特征及演化规律。结果表明：煤样内部裂隙分布受主裂隙控制且分布不均；随着载荷增加和时间的延长，煤样内部裂隙体积占煤样体积百分比有所增加；裂隙不仅变宽而且逐渐贯穿煤样，主裂隙附近还会生多条新的次生裂隙，交叉裂隙将主裂隙互相连通；煤岩体裂隙发育的方向主要是沿着轴向应力的方向或与其呈较小夹角扩展；裂隙的发育主要是微裂隙的破坏，其应力集中促进大裂隙的发育。研究结果可为研究钻孔周围煤体内瓦斯流动规律和确定抽采钻孔影响范围提供依据。

关键词:煤岩;蠕变;三轴加载;裂隙演化;CT扫描

doi:10.16186/j.cnki.1673-9787.2020.2.3

基金项目:国家自然科学基金资助项目（51574112 ）；国家重点研发计划项目（2017YFC0804207 ）；中国博士后科学基金资助项目 （2017M622343 ）；河南省博士后基金资助项目（001703047）；河南理工大学博士基金资助项目（B2016-03 ）

收稿日期:2019/05/18

修回日期:2019/06/22

出版日期:2020/03/15

Experimental study on evolution law of coal-rock fracture under triaxial compression creep

WEI Guoying1,2, WANG Zehua1, JIA Tianrang1,2

1.School of Safety Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.Research Center of the National Gas Geology and Gas Prevention Engineering， Jiaozuo  454000 ， Henan， China

Abstract:Under creep condition， the evolution law of fractures inside the coal affects the permeability of coal and gas extraction efficiency. Taking the raw coal of Zhaogu No. 2 coal mine in Jiaozuo mining area as the research object， and using the triaxial compression creep test and industrial CT scanning technology， and MATLAB software， the image equalization processing and binary image processing technology were carried out， the distribution characteristics and evolution rules of the internal fractures of coal samples under different loading conditions were studied. The results showed ： the internal fracture distribution of coal sample was controlled by the main fracture and was unevenly ； with the increase of loading and extension of loading time， the percentage of the internal fracture volume increased in the coal sample. The fracture widened and also gradually penetrated the coal sample. There were several new secondary fractures near the main fracture， and the main fracture was connected by the cross fractures. The direction of fracture development of coal-rock mass was mainly along the direction of its axial stress or extending with a small degree of the angle ； the development of fractures mainly was the first failure of micro-fractures， and the stress concentration promoted the development of large fractures. Therefore， the conclusion laid a foundation for the gas flow rule of coal-mass around the gas extraction boreholes and the determination of their influence range.

Key words:coal rock;creep;triaxial loading;fracture evolution;computed tomography scan

三轴压缩蠕变条件下煤岩裂隙演化规律试验研究_魏国营.pdf