裂隙煤岩三轴压缩特性宏细观试验研究  

Macro and Mesoscopic Experimental Research on Triaxial Compression Characteristics of Fractured Coal Rock

作　　者：岳东 霍小泉 任建喜[2] 袁增云 范志海 寇义民 侯正利 陈首佳 YUE Dong;HUO Xiaoquan;REN Jianxi;YUAN Zengyun;FAN Zhihai;KOU Yimin;HOU Zhengli;CHEN Shoujia(Shaanxi Coal Tongchuan Mining Co.,Ltd.,Tongchuan,Shaanxi 727000,China;School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China;Shaanxi Coal Tongchuan Mining Co.,Ltd.,Yuhua Coal Mine,Tongchuan,Shaanxi 727000,China)

机构地区：[1]陕西陕煤铜川矿业有限公司,陕西铜川市727000 [2]西安科技大学建筑与土木工程学院,陕西西安710054 [3]陕西陕煤铜川矿业有限公司玉华煤矿,陕西铜川市727000

出　　处：《矿业研究与开发》2022年第2期101-107,共7页Mining Research and Development

基　　金：国家自然科学基金资助项目(11872299,12072259);陕西省自然科学基金煤炭联合基金资助项目(2019JLP-01)

摘　　要：依托焦坪矿区某煤矿顺槽支护工程,以预制裂隙煤岩体为研究对象,采用宏观三轴压缩试验与细观核磁共振试验相结合的研究方法对裂隙煤岩体三轴压缩试验下宏细观变形、破坏特征及力学特性进行研究。研究结果表明:(1)完整煤样的三轴压缩强度对围压的敏感程度最高,其次为含45°倾角裂隙的煤岩样,含60°倾角裂隙的煤岩样的敏感程度最低;(2)裂隙煤岩的破坏模式随围压增加由直剪破坏向斜剪破坏过渡;(3)裂隙煤岩破坏的峰总面积及第4峰面积所占总面积百分比与围压及裂隙倾角成正相关;(4)裂隙煤岩的孔隙孔径主要分布在1~10μm,破坏后大孔径孔隙所占比例较高,随着裂隙倾角及围压的增加,裂隙煤岩内部更加破碎。Relying on the trench support project of a coal mine in Jiaoping mining area, taking the prefabricated fractured coal rock as the research object, the macro and micro deformation, failure characteristics and mechanical properties of fractured coal rock under triaxial compression tests were studied by using the research method combining macro triaxial compression test and micro nuclear magnetic resonance test. The results are concluded as follows.(1) The triaxial compressive strength of intact coal samples is the most sensitive to confining pressure, followed by coal samples with 45° dip fractures, and the coal samples with 60° dip fractures are the least sensitive.(2) The failure mode of fractured coal rock transits from direct shear failure to oblique shear failure with the increase of confining pressure.(3) The total peak area of fractured coal and rock failure, as well as the percentage of the fourth peak area in the total area are positively correlated with confining pressure and fracture dip angle.(4) The pore diameter of fractured coal is mainly distributed in 1~10 μm, and the proportion of pores with large diameters is higher after failure. With the increase of fracture angle and confining pressure, the inside of fractured coal rock is more broken.

关 键 词：裂隙煤岩 核磁共振试验 三轴压缩试验 破坏模型 孔隙分布 

分 类 号：TD313[矿业工程—矿井建设]