坚硬顶板上提工作面临界支护阻力计算与压架预防

Critical support resistance calculation in the working face of improving upper limit with hard roof and prevention countermeasures of support crushing

为了防止淮南潘一矿1602(3)坚硬顶板上提工作面再次发生压架事故,基于相似模拟实验结果,研究了工作面覆岩破断特征,建立了覆岩结构力学模型,推导出压架临界支护阻力计算式,确定了压架失稳判据,分析了影响压架临界支护阻力的因素。研究认为:采取减小面长、降低采高、保持工作面直接顶完整性、防止采空区顶板悬顶、加固工作面煤壁、采前疏水降压等措施有利于坚硬顶板上提工作面支架的稳定。在此研究基础上,提出了"强制放顶、高档普采、合理的设备选型"等防压架对策,并成功地应用于1602(3)改造面,获得了良好的经济效益。

To avoid support crushing disaster again in No. 1602（3） working face of improving upper limit with hard roof in Panyi coal mine, Huainan, based on the similar simulation results, the fracture characteristics of overlying strata were studied, the structure mechanics model of overlying strata were established, the critical support resistance was deduced, the instability criterion of support crushing was determined, and the factors influencing critical support resistance of support crushing were further analyzed. The results prove that these measures such as reducing working face length, lowering mining height, keeping the integrity of immediate roof, preventing large hanging roof in the gob, strengthening the coal wall, hydrophobic step-down before mining, etc. can be in favor of the stability of support in the working face of improving upper limit with hard roof. On this basis, further prevention countermeasures of support crushing such as forced caving, high-grade conventional mining, reasonable equipment selection, etc. were proposed, which were applied to the modified No.1602（3） working face successfully, and good economic benefits were obtained.