晁腾跃,华心祝,朱晔. 中组煤上覆煤层开采冲击荷载扰动下底板破坏深度研究[J]. 中国矿业,2024,33(1):138-146. DOI: 10.12075/j.issn.1004-4051.20230553
    引用本文: 晁腾跃,华心祝,朱晔. 中组煤上覆煤层开采冲击荷载扰动下底板破坏深度研究[J]. 中国矿业,2024,33(1):138-146. DOI: 10.12075/j.issn.1004-4051.20230553
    CHAO Tengyue,HUA Xinzhu,ZHU Ye. Study on failure depth of floor under impact load disturbance in overlying coal seam mining of middle group coal[J]. China Mining Magazine,2024,33(1):138-146. DOI: 10.12075/j.issn.1004-4051.20230553
    Citation: CHAO Tengyue,HUA Xinzhu,ZHU Ye. Study on failure depth of floor under impact load disturbance in overlying coal seam mining of middle group coal[J]. China Mining Magazine,2024,33(1):138-146. DOI: 10.12075/j.issn.1004-4051.20230553

    中组煤上覆煤层开采冲击荷载扰动下底板破坏深度研究

    Study on failure depth of floor under impact load disturbance in overlying coal seam mining of middle group coal

    • 摘要: 为研究近距离煤层中上煤层开采冲击荷载扰动下底板破坏发育情况,采用理论计算、数值模拟、现场观测等方法观察近距离煤层开采扰动下底板破坏范围,以半无限平面体理论结合摩尔-库伦破坏准则及屈服条件为基础,分析了顶板垮落冲击动荷载及静载作用下工作面底板下任意一点应力状态,计算得出底板破坏深度17.32 m;对近距离煤层开采进行数值模拟,走向方向推进25 m后,原位塑性区发育基本稳定,底板塑性区在逐步回采过程中发育呈现以煤壁下方塑性区“先垂直后水平扩散”特点,底板最大破坏深度16.12 m;采用钻孔呈像法对工作面采动前后底板破坏进行观测,工作面下方底板破坏深度范围在16.85 m附近,分析得出中组煤层61煤层开采扰动对下煤层62煤层、63煤层顶板稳定性造成破坏,验证了冲击荷载理论模型的可靠性,开采62煤层、63煤层需加强顶板支护。研究结果为近距离煤层开采扰动下底板破坏对下煤层影响范围提供参考。

       

      Abstract: In order to study the development of floor failure under the disturbance of impact load in the middle and upper coal seam mining of close distance coal seam, theoretical calculation, numerical simulation and field observation are used to observe the range of floor failure under the disturbance of close distance coal seam mining. Based on the semi-infinite plane theory combined with Mohr-Coulomb failure criterion and yield condition, the stress state of the floor at any point of the working face under the dynamic load and static load of roof collapse is analyzed, and the depth of floor failure is calculated to be 17.32 m. The numerical simulation of close distance coal seam mining is carried out. After advancing 25 m in the strike direction, the development of in-situ plastic zone is basically stable. The plastic zone of the floor develops in the process of gradual mining, which is characterized by “vertical and horizontal diffusion” under the coal wall. The maximum failure depth of the floor is 16.12 m. The borehole TV method is used to observe the floor failure before and after the mining of the working face. The failure depth of the floor below the working face is near 16.85 m. It is concluded that the failure caused by the mining disturbance of 61 coal seam in the middle group coal seam causes damage to the stability of the roof of 62 coal seam and 63 coal seam in the lower coal seam, which verifies the reliability of the theoretical model of impact load. The roof support should be strengthened in the mining of 62 coal seam and 63 coal seam. The research results provide a reference for the influence range of floor failure in the lower coal seam under the disturbance of close distance coal seam mining.

       

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