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深部近距离厚煤层开采覆岩结构空间的演化规律与应力分布特征

吕可 王金安

吕可, 王金安. 深部近距离厚煤层开采覆岩结构空间的演化规律与应力分布特征[J]. 华南师范大学学报(自然科学版), 2020, 52(3): 22-28. doi: 10.6054/j.jscnun.2020039
引用本文: 吕可, 王金安. 深部近距离厚煤层开采覆岩结构空间的演化规律与应力分布特征[J]. 华南师范大学学报(自然科学版), 2020, 52(3): 22-28. doi: 10.6054/j.jscnun.2020039
LV Ke, WANG Jin'an. Evolution and Stress Distribution of Overlying Strata in Deep and Thick Closer Coal Seam[J]. Journal of South China normal University (Natural Science Edition), 2020, 52(3): 22-28. doi: 10.6054/j.jscnun.2020039
Citation: LV Ke, WANG Jin'an. Evolution and Stress Distribution of Overlying Strata in Deep and Thick Closer Coal Seam[J]. Journal of South China normal University (Natural Science Edition), 2020, 52(3): 22-28. doi: 10.6054/j.jscnun.2020039

深部近距离厚煤层开采覆岩结构空间的演化规律与应力分布特征

doi: 10.6054/j.jscnun.2020039
基金项目: 

国家“十三五”重点研发计划项目 2017YFC1503104

详细信息
    作者简介:

    王金安,教授,Email:wja@ustb.edu.cn

  • 中图分类号: TD353

Evolution and Stress Distribution of Overlying Strata in Deep and Thick Closer Coal Seam

  • 摘要: 针对深井近距离煤层回采过程中,煤层工作面及其巷道频繁出现的形变过大、矿压突增问题,以海石湾煤矿近距离煤层开采为参考,采用相似模拟实验与理论计算方法,分别对距离相近的煤层因回采造成的覆岩结构演化、运动及围岩应力变化进行了模拟与分析.研究表明:覆岩中主关键层是否失稳破断对矿压分布的影响重大.在主关键层破断前,近场结构是矿压增量的主要来源,并使矿压具有波动性;当主关键层破断后,远场结构对于近距离各煤层矿压增量均起到主要作用,并使其变化特征具有典型的跳跃性.自下而上逐级传播的覆岩结构演化造成了主关键层的阶段性沉降,对于矿压的跳跃式变化起到了主要作用.研究发现了近距离煤层开采过程中的覆岩演化规律和矿压产生机理,对于采场矿压控制和巷道支护优化具有指导意义.
  • 图  1  各工作面的位置代号及其开采步骤

    Figure  1.  The location code of each working face and its mining steps

    图  2  关键层破断影响下的支承压力及计算模型

    Figure  2.  The mine pressure increment and calculation model under the influence of key layer breaking

    图  3  上煤层回采前期本煤层顶板支承压力的增量分布

    Figure  3.  The incremental distribution of roof support pressure in the upper coal seam in the early stage of mining

    图  4  上煤层回采后期本煤层顶板支承压力增量的分布

    Figure  4.  The incremental distribution of roof support pressure in the upper coal seam in the later stage of mining

    图  5  下煤层回采期间上煤层顶板支承压力增量的分布

    Figure  5.  The incremental distribution of roof support pressure in the upper coal seam during lower coal seam mining

    图  6  下煤层回采期间上煤层顶板支承压力增量的实验结果

    Figure  6.  The experimental result of roof support pressure in the upper coal seam during lower coal seam mining

    表  1  各关键层(组)的基本参数

    Table  1.   The basic parameters of each key layer (group)

    关键层(组)名称 关键层厚度/m 初次断裂
    距离/m
    周期断裂
    距离/m
    块体厚度
    Hi/m
    地基系数
    ki/(×107 N·m-3)
    衰减系数
    αi/m-1
    亚关键层一(Y1) 21.97 76.5 27.5 53.95 3.1 0.030
    亚关键层二(Y2) 28.79 140.6 28.3 84.54 3.4 0.028
    煤壁上方主关键层 43.70 280.7 45.7 - 3.0 0.019
    采空区上主关键层 43.70 280.7 45.7 - 1.5 0.016
    下载: 导出CSV
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  • 收稿日期:  2020-03-26
  • 刊出日期:  2020-06-25

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