复合结构型特厚软煤层“结构性”冲击机理研究

    Mechanism Research on "Structural" Rock Burst of Thick and Soft Coal

    • 摘要: 为分析各种煤-矸(煤)组合结构与冲击地压之间的关系,采用理论分析、数值模拟及现场验证相结合的方法,提出了复合结构型特厚软煤层“结构性”冲击的概念,探讨了可冲击软煤层的结构模型,并模拟了其应力演变过程。研究表明:复合结构型特厚软煤的缺陷性可能引发“结构性”冲击;“结构性”冲击发生时,沿走向结构承载体的应力集中过程分为3个阶段:复合结构型煤体向结构承载体过渡阶段,结构承载体附加超前应力阶段,结构承载体破坏阶段;随着工作面接近结构煤层,工作面超前支承压力峰值增大,影响范围减小。

       

      Abstract: In order to analyze the relationship between rock burst and the composite structure, using a variety of methods, the concept named "structural rock burst" was proposed. We discuss the structural model of "structural" rock burst, and simulate stress evolution of the structure carrier. The results show that rock burst might cause the defective of thick and soft coal seam; stress concentration process of carrier position is divided into three phases along strike when it is "structural" rock burst: first stage is the transitional phase which is from the composite structure type of thick and soft coal on bearing structure, adding advance stress on bearing structure at the second phase, finally, bearing structural damage; with working face close to bearing structure, the face abutment pressure peak increased and the range of impact reduced.

       

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