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布尔台矿单轴加卸载下砂质泥岩声发射特征研究

曹金钟 杨志良 王文杰

曹金钟,杨志良,王文杰. 布尔台矿单轴加卸载下砂质泥岩声发射特征研究[J]. 工矿自动化,2022,48(6):147-153, 158.  doi: 10.13272/j.issn.1671-251x.2021110046
引用本文: 曹金钟,杨志良,王文杰. 布尔台矿单轴加卸载下砂质泥岩声发射特征研究[J]. 工矿自动化,2022,48(6):147-153, 158.  doi: 10.13272/j.issn.1671-251x.2021110046
CAO Jinzhong, YANG Zhiliang, WANG Wenjie. Study on acoustic emission characteristics of sandy mudstone under uniaxial loading and unloading of Buertai Coal Mine[J]. Journal of Mine Automation,2022,48(6):147-153, 158.  doi: 10.13272/j.issn.1671-251x.2021110046
Citation: CAO Jinzhong, YANG Zhiliang, WANG Wenjie. Study on acoustic emission characteristics of sandy mudstone under uniaxial loading and unloading of Buertai Coal Mine[J]. Journal of Mine Automation,2022,48(6):147-153, 158.  doi: 10.13272/j.issn.1671-251x.2021110046

布尔台矿单轴加卸载下砂质泥岩声发射特征研究

doi: 10.13272/j.issn.1671-251x.2021110046
基金项目: 山西省基础研究计划项目(20210302124355)。
详细信息
    作者简介:

    曹金钟(1969-),男,山东枣庄人,高级工程师,主要从事煤矿生产技术与管理工作,E-mail:84206520@qq.com

    通讯作者:

    杨志良(1987—),男,河南柘城人,讲师,博士,主要研究方向为岩石力学,E-mail: 15993791548@163.com

  • 中图分类号: TD315

Study on acoustic emission characteristics of sandy mudstone under uniaxial loading and unloading of Buertai Coal Mine

  • 摘要: 采掘反复扰动诱导的加卸载效应是造成井巷工程岩体破坏的重要诱因,但目前缺乏对西部广泛分布的弱胶结砂质泥岩在加卸载状态下力学响应的研究。针对该问题,以国家能源集团神东布尔台煤矿钻孔BK209中砂质泥岩为研究对象,采用单轴分级加卸载试验方案(设置I,II,III 3种加卸载路径,其中加卸载路径I采用位移控制,加卸载路径II,III采用荷载控制),研究不同加卸载路径下砂质泥岩的力学及声发射(AE)特征。研究结果表明:① 加卸载路径I下试样应力达到峰值后跌落较快,表现出脆性特征;加卸载路径II下试样应力达到峰值后跌落有限,有一定残余强度;加卸载路径III下试样应力达到峰值后分级跌落,表现出一定延性特征。② 加卸载路径越短,卸载阶段弹性模量增加越大,主要是因为在加载过程中新生裂隙接触面因剪切滑移产生碎屑,卸载路径短,受到拉应力脱落的碎屑充分充填到附近空隙,裂隙面之间的摩擦能力变强。③ 第1次加载阶段,路径I下AE振铃计数呈先增后减的对称变化,路径II下AE振铃计数呈左偏峰变化,路径III下AE振铃计数呈增减波动变化,中间波动较大;第2次加载阶段,在加载路径I,III下,当应力增至临近峰值,达到砂质泥岩屈服极限时,AE振铃计数陡增,出现Kaiser点;最后1次加载至峰值过程中,路径I下AE振铃计数先均匀持续发生,接着渐进式增加,路径II,III下AE振铃计数均先均匀持续发生,临近峰值应力呈跳跃式增长。④ 第1次加载阶段,由于应力较低,AE振铃计数较少,AE处于相对平静期;在卸载阶段,基本无振铃计数,AE处于间歇期;随着应力提高和加卸载次数增多,AE振铃计数相对增加,AE处于波动期;最后1次加载至峰值的过程中,砂质泥岩处于破坏阶段,AE振铃计数激增,AE进入活跃期。

     

  • 图  1  加工试样

    Figure  1.  Test samples

    图  2  试验系统

    Figure  2.  Test system

    图  3  加卸载路径

    Figure  3.  Loading and unloading schemes

    图  4  不同加卸载路径下砂质泥岩的应力−应变关系

    Figure  4.  The stress-strain relationship of sandy mudstone different loading and unloading paths

    图  5  砂质泥岩不同路径加载阶段AE振铃计数与应力关系

    Figure  5.  The relationship between AE ringing counts and stress of sandy mudstone under different loading stages

    图  6  不同加卸载路径对AE振铃计数和应力的影响

    Figure  6.  Influence of different loading and unloading paths on AE ringing counts and stress

    表  1  试样基本参数及岩层特征

    Table  1.   Sample parameters and strata characteristics

    编号直径/mm高度/mm波速/(km·s−1)密度/(g·cm−3加卸载路径抗压强度/MPa循环级数岩性描述
    1124.9450.281.3442.24I13.721灰褐色,局部破碎,夹薄层棕色泥岩,含灰绿色砂质包裹体;断口平坦,含砂量少许,夹薄层粉砂岩
    1224.8250.621.3302.22I13.191
    2124.6550.281.3022.26II12.681
    2224.5751.241.1362.24II18.742
    2324.1850.921.0872.33II22.642
    3124.8050.981.1162.17III8.061
    3224.6351.171.1792.28III11.231
    3324.8953.410.9122.12III13.161
    下载: 导出CSV

    表  2  砂质泥岩单轴加卸载弹性模量

    Table  2.   Elastic modulus of sandy mudstone during uniaxial loading and unloading

    加卸载
    路径
    试样
    编号
    加载阶段弹
    性模量/GPa
    加载阶段平均
    弹性模量/GPa
    卸载阶段弹
    性模量/GPa
    卸载阶段平均
    弹性模量/GPa
    I112.111.663.242.65
    121.212.06
    II210.940.921.551.52
    220.931.26
    230.911.74

    III
    310.630.991.16
    1.56
    321.121.74
    331.221.79
    下载: 导出CSV
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  • 收稿日期:  2021-11-18
  • 修回日期:  2022-05-25
  • 网络出版日期:  2022-04-12

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