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围压与冲击扰动作用下组合煤岩超低摩擦效应分析

李利萍 吴金鹏 鞠翔宇 王淋

李利萍, 吴金鹏, 鞠翔宇, 等, 2019. 围压与冲击扰动作用下组合煤岩超低摩擦效应分析. 地质力学学报, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093
引用本文: 李利萍, 吴金鹏, 鞠翔宇, 等, 2019. 围压与冲击扰动作用下组合煤岩超低摩擦效应分析. 地质力学学报, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093
LI Liping, WU Jinpeng, JU Xiangyu, et al., 2019. ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE. Journal of Geomechanics, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093
Citation: LI Liping, WU Jinpeng, JU Xiangyu, et al., 2019. ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE. Journal of Geomechanics, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093

围压与冲击扰动作用下组合煤岩超低摩擦效应分析

doi: 10.12090/j.issn.1006-6616.2019.25.06.093
基金项目: 

国家重点研发计划 2016YFC0600901

国家重点研发计划 2017YFC0804208

国家自然科学基金项目 51874165

国家自然科学基金项目 51974148

辽宁省"兴辽英才计划"项目 XLYC1807130

详细信息
    作者简介:

    李利萍(1983-), 女, 博士, 副教授, 主要从事深部岩体力学特性方面的教学与研究工作。E-mail:llpah@126.com

  • 中图分类号: TD324

ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE

  • 摘要: 深部煤岩在垂直扰动作用下发生振动,当水平冲击足以克服块体间摩擦阻力时,极易发生超低摩擦型冲击地压。文章以细砂岩-煤-细砂岩组合块体为研究对象,考虑顶板-煤-底板临近工作面开采工况,采用数值模拟方法,建立围压与冲击扰动下组合煤岩数值模型,以煤块水平位移、垂直加速度差值作为超低摩擦效应特征参数,分析围压、垂直冲击及水平冲击对特征参数的影响规律。研究结果表明:在垂直冲击与围压共同作用下,煤岩体残余位移及水平位移峰值随围压增大且呈指数增长趋势;在垂直冲击、水平冲击和围压三者共同作用下,煤岩体超低摩擦效应强度与作用时间都随着围压呈增加趋势;垂直冲击对组合煤岩超低摩擦效应的影响最为显著。

     

  • 图  1  冲击能量力学转化形式

    Figure  1.  Mechanical transformation of impact energy

    图  2  数值模拟模型图

    Figure  2.  Diagram of the numerical simulation model

    图  3  数值模拟与已有实验对比

    Figure  3.  Comparison between numerical simulation and previous experiments

    图  4  围压与水平位移关系曲线

    Figure  4.  Curves of relation between confining pressure and horizontal displacement

    图  5  工作块体残余位移、水平位移峰值与围压关系曲线

    Figure  5.  Curves of residual displacement, horizontal displacement peak and confining pressure of the working block

    图  6  不同围压下垂直加速度差值变化曲线

    Figure  6.  Curves of vertical acceleration difference under different confining pressures

    图  7  冲击与残余位移关系曲线

    Figure  7.  Curves of impact and residual displacement

    图  8  冲击、围压与残余位移关系曲线

    Figure  8.  Curves of relation between impact, confining pressure and residual displacement

    图  9  垂直加速度差值与围压关系曲线

    Figure  9.  Curves of relation between difference of vertical acceleration and confining pressure

    表  1  模型力学参数

    Table  1.   Relevant mechanical parameters of the numerical simulation model

    砂岩
    参数名称 取值 参数名称 取值
    密度/(g/cm3) 2.80 密度/(g/cm3) 1.38
    抗拉强度/MPa 11.12 抗拉强度/MPa 0.15
    粘聚力/MPa 5.87 粘聚力/MPa 1.25
    内摩擦角/(°) 53.05 内摩擦角/(°) 32.00
    泊松比 0.11 泊松比 4.90
    弹性模量/GPa 50.80 弹性模量/GPa 2.10
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-10-15
  • 修回日期:  2019-09-10
  • 刊出日期:  2019-12-31

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