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浅埋煤层过沟开采覆岩裂隙与地表裂缝演化规律数值模拟

魏江波 王双明 宋世杰 孙强

魏江波,王双明,宋世杰,等. 浅埋煤层过沟开采覆岩裂隙与地表裂缝演化规律数值模拟[J]. 煤田地质与勘探,2022,50(10):67−75. doi: 10.12363/issn.1001-1986.22.03.0134
引用本文: 魏江波,王双明,宋世杰,等. 浅埋煤层过沟开采覆岩裂隙与地表裂缝演化规律数值模拟[J]. 煤田地质与勘探,2022,50(10):67−75. doi: 10.12363/issn.1001-1986.22.03.0134
WEI Jiangbo,WANG Shuangming,SONG Shijie,et al. Numerical simulation on evolution law of overburden fractures and surface cracks in crossing ditch mining of shallow coal seam[J]. Coal Geology & Exploration,2022,50(10):67−75. doi: 10.12363/issn.1001-1986.22.03.0134
Citation: WEI Jiangbo,WANG Shuangming,SONG Shijie,et al. Numerical simulation on evolution law of overburden fractures and surface cracks in crossing ditch mining of shallow coal seam[J]. Coal Geology & Exploration,2022,50(10):67−75. doi: 10.12363/issn.1001-1986.22.03.0134

浅埋煤层过沟开采覆岩裂隙与地表裂缝演化规律数值模拟

doi: 10.12363/issn.1001-1986.22.03.0134
基金项目: 国家自然科学基金项目(41402308);榆林市科技计划重大项目(6130819001);陕西省煤炭绿色开发地质保障重点实验室重点基金项目(DZBZ2022Z-03)
详细信息
    第一作者:

    魏江波,1991年生,男,陕西长武人,博士研究生,从事矿山地质灾害防治等方面的研究. E-mail:18109071009@stu.xust.edu.cn

    通信作者:

    宋世杰,1983年生,男,山东济南人,博士,副教授,从事矿山地质灾害防治与环境保护方面的教学与科研工作.E-mail:kkkbff@163.com

  • 中图分类号: TD323

Numerical simulation on evolution law of overburden fractures and surface cracks in crossing ditch mining of shallow coal seam

  • 摘要: 浅埋煤层过沟开采在陕北矿区普遍存在,严重威胁着矿井安全生产和生态健康发展。覆岩采动裂隙及地表裂缝的发育是岩体微裂隙的延伸和扩展的结果,为更加系统地研究浅埋煤层过沟开采覆岩微裂隙的演化规律,以陕北安山井田125203工作面为背景,根据现场沟道剖面及钻孔资料,采用Particle Flow Code (PFC)数值模拟平台构建颗粒流数值采煤模型,模拟分析覆岩微裂隙的发育特征、数量变化规律和力链演化特征,揭示微裂隙的发育规律和地表裂缝发育机理。结果表明:浅埋煤层过沟开采过程中,覆岩微裂隙发育表现为“产生–延伸和扩展–聚合成群–贯通成缝”的动态演化过程;根据微裂隙的基本发育特征及分布规律,可将发育全程划分为非连续跳跃式、连续贯通式和横向扩展式3个微裂隙发育阶段;覆岩微裂隙数量随工作面推进距离的增大而增多,非连续跳跃式和连续贯通式发育阶段呈现指数增长特征,分别累计发育微裂隙547和2 867条,覆岩微裂隙逐渐发育至地表;横向扩展式发育阶段呈线性增长特征,累计发育微裂隙11 705条,微裂隙数量随岩层高度的增大而减小;覆岩力链演化过程中,强黏性力链的破坏致使微裂隙发育,局部产生应力集中,强黏性力链拱自下而上逐渐破坏并贯通至地表,导致微裂隙延伸发育至地表形成地裂缝,力链在未贯通岩层的微裂隙两侧和尖端及地表裂缝两侧形成强力链区,微裂隙处形成弱(无)力链区。该研究成果可为陕北矿区浅埋煤层过沟开采覆岩及地表损害防控提供理论指导。

     

  • 图  野外地表裂缝

    Fig. 1  Field surface cracks

    图  125203工作面菜沟段颗粒流数值模型

    Fig. 2  Numerical model of particle flow in Cai ditch section of working face 125203

    图  平行黏结模型本构模型

    Fig. 3  Constitutive model of parallel bond model

    图  工作面推进不同距离时覆岩微裂隙演化规律

    Fig. 4  Evolution law of overburden microfractures at different distance of working face advancing

    图  覆岩裂隙发育3阶段特征

    Fig. 5  Characteristics of three stages of fracture development in overlying strata

    图  覆岩微裂隙发育数量变化曲线

    Fig. 6  Variation curve of overburden microfractures number

    图  不同位置处的微裂隙数量变化

    Fig. 7  Variation in the number of microcracks at different locations

    图  工作面推进不同距离时覆岩力链变化特征

    Fig. 8  Variation characteristics of overburden force chain at different distance of working face advancing

    图  微裂隙与力链特性关系

    Fig. 9  Relationship between micro fracture and force chain characteristics

    表  1  PFC数值模型力学参数

    Table  1  Mesoscopic strength parameters of particles model

    岩性ρ/(kg·m−3)E*/GPac/MPaσc/MPaβμ
    黄土17020.240.170.060.400.40
    风化基岩22006.3012.004.000.300.25
    细粒砂岩278010.0017.106.700.100.55
    泥质粉砂岩27606.7015.905.300.500.50
    煤层14201.007.802.600.400.45
    粉砂岩27607.0016.205.400.200.50
    下载: 导出CSV
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  • 收稿日期:  2022-03-08
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