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现场实测分析表明,在放煤过程中,四柱支撑掩护式放顶煤液压支架的承载具有动态变化特征,后柱阻力普遍小于前柱阻力,甚至有相当比例的阻力降为零,支护强度降低,致使支架不能充分发挥其有效支护作用。表明高强度支架并不一定是高可靠性支架。分析了放顶煤支架产生这种动态承载特征的原因,提出了提高综放支架可靠性的方法。
Field measurement and analysis showed that during the process of coal caving, the bearing of four-post support caving hydraulic support has dynamic characteristics, the resistance of rear column is generally less than the resistance of front column, and even a considerable proportion of the resistance is reduced to zero and the supporting strength is reduced , Resulting in stent can not give full play to its effective support role. It shows that high strength stents are not necessarily high reliability stents. The reason of the dynamic bearing characteristics of the caving support was analyzed, and the method of improving the reliability of the caving support was put forward.