中厚煤层综采工作面支架实时工作阻力确定

Determination of real-time working resistance of support in fully-mechanized working face of medium-thickness coal seam

  • 摘要: 为研究中厚煤层综采工作面液压支架实时工作阻力随顶板断裂的演化过程,建立了基于弹性基础梁的采场顶板力学模型,分析了顶板运移规律,指出上覆岩层超前工作面断裂,给出了超前断裂距的解析解。结合工程实际,分析了工作面初次来压和周期来压时顶板破断形式,得到了周期来压期间支架实时工作阻力的计算公式。研究结果表明:单个来压周期内老顶发生2次断裂,初次破断前,支架工作阻力是关于老顶悬露长度的非线性函数,当悬露长度达到极限破断距时,老顶发生破断,支架工作阻力达到最大值;二次破断前,支架工作阻力随工作面推进呈二次函数式增大,老顶发生破断时达到最大值。

     

    Abstract: In order to study evolution of real-time working resistance of hydraulic support with roof breaking in fully-mechanized working face of medium-thickness coal seam, a mechanical model of main roof was established based on elastic foundation beam, and law of main roof movement was analyzed. It was pointed out that breaking position of overlying strata was in front of working face, and analytical solution of pre-breaking distance was given. The roof breaking form of the initial weighting and period weighting of working face were analyzed combined with engineering practice, and calculation formulas of real-time working resistance of support during period weighting were obtained. The research results are as following. Main roof fractures twice in a single weighting cycle. Working resistance of support is a nonlinear function of suspension length of main roof before the first breaking. When the suspension length is equal to limit breaking distance, working resistance of support reaches the maximum value with main roof breaking. Before the second breaking of main roof, working resistance of support increases with working face advance distance as a quadratic function, and reaches the maximum value with main roof breaking.

     

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