浅埋薄基岩超长工作面液压支架群组的承载特性及安全管控研究

Bearing characteristics and safety control of hydraulic support groups in shallow-buried thin bedrock ultra-long working faces

为探究浅埋薄基岩超长工作面液压支架群组的承载特性,构建了工作面煤壁-支架-顶板的弹性基础梁力学模型,研究了7种因素对支架阻力的影响。理论计算与实测结果吻合良好。研究结果表明:支架工作阻力呈单峰值与“M”形三峰值两种分布形式;工作面长度、基本顶厚度和弹性模量影响支架阻力分布曲线形状和高阻力范围;采高和上覆岩层载荷影响曲线值;支架刚度影响高阻力范围;巷帮刚度影响靠近巷道侧的支架阻力。基于此,提出了包括确定适当面长、支架分区调控、煤壁协同控制、巷帮主动强化等手段在内的浅埋薄基岩超长工作面关键安全管控措施。研究成果可为浅埋薄基岩超长工作面支架阻力设计与灾害预防提供理论依据。

To explore bearing characteristics of hydraulic support groups in shallow-buried thin bedrock ultra-long working faces,a beam-on-elastic foundation(BEF)mechanical model was established for the coal walls,supports,and roof of the working face.The influence of seven factors on the resistance of the supports was investigated.The theoretical calculation and the actual measurement are in good agreement.Results show that working resistance of supports is distributed in two patterns:single-peak and M-shaped three-peak forms.The working face length and main roof thickness and elastic modulus have influence on the shape of the resistance distribution curve and the range of high support resistance.The mining height and overlying strata load affect the value of the curve.The support stiffness affects the range of high resistance.The roadway sidewalls stiffness affects the support resistance near the roadway side.Based on this,key safety control measures for shallow ultra-long working faces with thin bedrocks including determination of appropriate working face length,zonal regulation of supports,cooperative control of coal walls,and active reinforcement of roadway sidewalls were proposed.The research results provide a theoretical basis for design of support resistance and disaster prevention in shallow ultra-long working faces with thin bedrock.