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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：屋顶和宏观偏移爆破在创新的非专利采矿方法中的玻璃周边环境稳定性

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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采矿方法，新兴和创新的非宝石长壁采矿方法，可以大大提高煤炭回收率并减少入境事故。该方法的核心技术之一是屋顶分裂，与保留条目的稳定性直接相关的操作。在这项工作中，介绍了定向屋顶分流爆破（DRSB）技术，并且在中间和大型钢丝中综合地研究了DRSB对入口环境稳定性的影响。首先，考虑屋顶岩石的异质性的微机械损伤模型使用有限元方法（FEM）开发，使用FEM模型进行了数值探索车顶岩石中的爆破诱导的损伤演化。随后，使用有限差分法（FDM）研究DRSB的宏观偏差。开发了一种常规验证的FDM数值模型，其具有用于GOB材料和校准参数的双产模型，以研究屋顶分裂对入口环境的稳定性的影响。最终使用现场监控数据验证数值模拟结果。这些结果表明，DRSB技术可以有效地控制屋顶岩石中的裂纹传播，并保护入口屋顶免受碎片或损坏。宏观分析表明，DRSB的应用影响了入口环境的应力分布和失效状态。随着屋顶分裂效应得到增强，将更多的垂直应力转移到GOB区域，导致进入周围的应力浓度被减轻。因此，降低了入口环境中的变形，提高了保留条目的稳定性。所提出的模型和获得的结果可能为类似项目中的避免挖掘应用产生合理的值。

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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采矿方法;屋顶分爆;损坏进化;稳定控制玻璃;

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