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首页> 外文期刊>Tunnelling and underground space technology >Meso- and macroeffects of roof split blasting on the stability of gateroad surroundings in an innovative nonpillar mining method
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Meso- and macroeffects of roof split blasting on the stability of gateroad surroundings in an innovative nonpillar mining method

机译：创新的无桩开采方法对顶板裂口爆破的中微观影响

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摘要

The 110 mining method, an emerging and innovative nonpillar longwall mining method, can dramatically increase coal recovery rates and reduce entry accidents. One of the core techniques of this method is roof splitting, the operation that is directly related to the stability of the retained entry. In this work, a directional roof split blasting (DRSB) technique was introduced, and the effects of DRSB on the stability of the entry surroundings were comprehensively studied at the meso- and macrolevels. First, a micromechanical damage model considering the heterogeneity of the roof rock was developed using the finite element method (FEM), and the blasting-induced damage evolution in the roof rock was numerically explored using the FEM model. Subsequently, the macroeffects of DRSB were studied using the finite difference method (FDM). A meticulously validated FDM numerical model incorporating a double-yield model for the gob materials and calibrated parameters was developed to investigate the effects of roof splitting on the stabilities of the entry surroundings. The numerical simulation results were finally verified using on-site monitoring data. These results indicate that the DRSB technique could effectively control crack propagation in the roof rock and protect the entry roof from being fragmented or damaged. Macroscopic analysis revealed that applications of DRSB affected the stress distributions and failure states of the entry surroundings. As the roof splitting effects were enhanced, more vertical stresses were transferred to the gob area, causing the stress concentrations in the entry surroundings to be mitigated. Consequently, the deformations in the entry surroundings were reduced, and the stability of the retained entry was improved. The proposed models and obtained results potentially produce reasonable values for the applications of pillarless mining in similar projects.
机译：110采煤法是一种新兴且创新的无桩长壁采煤法，可以显着提高采煤率并减少进入事故。该方法的核心技术之一是屋顶分割，其操作与保留入口的稳定性直接相关。在这项工作中，介绍了定向屋顶劈裂爆破（DRSB）技术，并在中观和宏观层面全面研究了DRSB对入口周围环境稳定性的影响。首先，利用有限元方法（FEM）建立了考虑顶板非均质性的微机械损伤模型，并利用FEM模型对顶板中爆破引起的损伤演化进行了数值研究。随后，使用有限差分法（FDM）研究了DRSB的宏观效应。建立了经过仔细验证的FDM数值模型，该模型结合了采空区物料和标定参数的双产量模型，以研究屋顶劈裂对入口周围环境稳定性的影响。最终使用现场监测数据验证了数值模拟结果。这些结果表明，DRSB技术可以有效地控制顶板岩石中的裂纹扩展，并保护入口顶板免于破碎或损坏。宏观分析表明，DRSB的应用影响了入口周围环境的应力分布和破坏状态。随着屋顶劈裂效果的增强，更多的垂直应力转移到了采空区，从而减轻了入口周围的应力集中。因此，减少了入口周围环境的变形，并且改善了保持入口的稳定性。所提出的模型和获得的结果可能为类似项目中的无柱开采应用提供合理的价值。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第8期|99-118|共20页
  • 作者

    Gao Yubing; Wang Yajun; Yang Jun; Zhang Xingyu; He Manchao;

  • 作者单位

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China|China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China;

    Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China|China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China|China Univ Min & Technol, Sch Mech & Civil Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    110 mining method; Roof split blasting; Damage evolution; Stability control of the gateroad;

    机译：110采矿法;屋顶劈裂爆破;损伤演化;闸道的稳定性控制;

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