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綜放沿空異形煤柱留巷系統力學場演化規律

Stress evolution of an irregular pillar protected roadway system remained along goal in fully mechanized top-coal caving mining field

  • 摘要: 研究了不同煤柱寬度時綜放沿空異形煤柱錨網支護留巷系統圍巖應力分布和破壞特征.揭示了煤體邊緣水平應力和垂直應力峰值不耦合的規律以及巷道頂板應力峰值隨煤柱寬度不同而演化的軌跡.深入探討了綜放沿空留巷巖石力學系統的控制變量,并根據控制變量的取值對系統穩定性區域進行了劃分,對不同煤柱寬度時的巷道系統穩定性進行了綜合分析和評價,對綜放沿空留巷合理護巷煤柱寬度提出了建議.提出并實施了“以加固沿空異形煤柱為主、懸承錨網支護留巷圈為輔”的綜合控制技術.

     

    Abstract: The stress distribution and its evolution modes in surrounding rocks of a roadway were comprehensively studied with respect to different pillar widths, where the roadway had been protected by an irregular pillar remained along the goaf in mechanized top-coal caving mining and supported by bolt-mesh technique. The study manifested the uncoupled pattern of the peak stresses in vertical and horizontal directions, as well as the stress evolution trace varying with pillar width. The control variable was pointed out for the mechanical system, and the different stability areas were distinguished correspondent to its value. Through the general analysis and assessment on stability of the roadway system protected by the pillar with different widths, the reasonable pillar width was promoted for effective protection of the roadway in mechanized top-coal caving mining panel. A comprehensive control technique was proposed and employed in practice through reinforcing the irregular pillar as a main way and hanging the mesh and bolt rock mass as a auxiliary means to support the gateway remained along the goal.

     

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