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回撤通道直接顶下沉量计算及其影响因素分析

王树帅 王志强 黄鑫 苏泽华

王树帅, 王志强, 黄鑫, 苏泽华. 回撤通道直接顶下沉量计算及其影响因素分析[J]. 矿业科学学报, 2021, 6(4): 409-417. doi: 10.19606/j.cnki.jmst.2021.04.005
引用本文: 王树帅, 王志强, 黄鑫, 苏泽华. 回撤通道直接顶下沉量计算及其影响因素分析[J]. 矿业科学学报, 2021, 6(4): 409-417. doi: 10.19606/j.cnki.jmst.2021.04.005
Wang Shushuai, Wang Zhiqiang, Huang Xin, Su Zehua. Calculation of direct roof subsidence of retracement channel and analysis of its influencing factors[J]. Journal of Mining Science and Technology, 2021, 6(4): 409-417. doi: 10.19606/j.cnki.jmst.2021.04.005
Citation: Wang Shushuai, Wang Zhiqiang, Huang Xin, Su Zehua. Calculation of direct roof subsidence of retracement channel and analysis of its influencing factors[J]. Journal of Mining Science and Technology, 2021, 6(4): 409-417. doi: 10.19606/j.cnki.jmst.2021.04.005

回撤通道直接顶下沉量计算及其影响因素分析

doi: 10.19606/j.cnki.jmst.2021.04.005
基金项目: 

国家自然科学基金 51774289

国家自然科学基金 52074291

西部煤炭绿色安全开发国家重点实验室开放基金 SKLCRKF1903

北京市大学生创新训练 C202011074

详细信息
    作者简介:

    王树帅(1993—),男,内蒙古赤峰人,博士研究生,主要从事巷道支护及煤矿绿色充填开采的研究工作。Tel:18401624262,E-mail:wsstree@163.com

    通讯作者:

    王志强(1980—),男,内蒙古呼伦贝尔人,博士,副教授,主要从事矿山压力及岩层控制等方面的研究工作。Tel:13810796225,E-mail:wzhiqianglhm@126.com

  • 中图分类号: TD353

Calculation of direct roof subsidence of retracement channel and analysis of its influencing factors

  • 摘要: 回撤通道的直接顶下沉量对设备回撤具有重要影响,本文基于基本顶断裂位置,建立了工作面贯通后回撤通道直接顶挠度力学模型,将支承应力表达式简化为与其拟合的xn次抛物线函数,断裂位置不同,n的取值不同,推导出了回撤通道顶板中心线处直接顶下沉量表达式。312工作面基本顶断裂位置d约12 m,此时n取4,求得直接顶下沉量约为105 mm。在理论计算的基础上,对直接顶下沉量影响因素进行了分析,结果表明:直接顶下沉量随着基本顶断裂位置、煤层埋深、应力集中系数及回撤通道跨度的增大而增加,随着直接顶厚度及弹性模量的增大而减小,其余因素影响较弱。在保证设备回撤空间的条件下,尽可能减小回撤通道跨度,控制直接顶下沉量。
  • 图  1  182312工作面布置

    Figure  1.  Roadway layout of 182312 working face

    图  2  基本顶不同断裂形式示意图

    lz—基本顶周期断裂步距,平均为20 m;d—基本顶断裂位置与实体煤破碎区内边缘的距离,m

    Figure  2.  Diagram of different fracture forms of the basic roof

    图  3  回撤通道直接顶挠度力学模型

    Figure  3.  Mechanical model of direct top deflection of retracting channel

    图  4  支承应力拟合曲线

    Figure  4.  Support stress fitting curve

    图  5  应力曲线与抛物线拟合曲线对比

    Figure  5.  Stress curves and parabolic fitting diagram

    图  6  基本顶断裂位置d的影响规律

    Figure  6.  Influence law of the basic roof fracture location d

    图  7  地质因素对直接顶下沉量的影响规律

    Figure  7.  Influence of geological factors on direct roof subsidence

    图  8  工程因素对直接下沉量的影响规律

    Figure  8.  Influence of engineering factors on direct roof subsidence

    图  9  测站位置布置示意图

    Figure  9.  Station location layout diagram

    图  10  测站数据曲线

    Figure  10.  Station data curves

    表  1  312工作面地质及工程参数

    Table  1.   Geological and engineering parameters of 312 working face

    参数符号 单位 数值
    工作面埋深H m 500
    上覆岩层容重γ MPa/m 0.025
    应力峰值系数k - 2.6~3.0
    直接顶厚度h0 m 3.78
    直接顶弹性模量E GPa 26
    平均采高M m 3.2
    煤层泊松比μ - 0.25
    出煤巷宽度D1 m 4.2
    支架控顶距D2 m 4.6
    出煤巷支护阻力f1 MPa 0.25
    支架工作阻力f2 MPa 0.64
    下载: 导出CSV
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  • 收稿日期:  2020-11-06
  • 修回日期:  2020-12-08
  • 刊出日期:  2021-08-01

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