大采高工作面煤壁片帮影响因素分析

Analysis on Influencing Factors of Large Mining Height Face Coal Wall Spalling

针对晋煤集团成庄矿5310大采高工作面煤壁片帮现状,采用现场统计和数值模拟,分析了地质构造、推进速度及停产、顶板来压、采高、支架工作阻力5个因素对片帮的影响,并提出了相应的技术措施。结果表明:地质构造破坏了煤体连续性,煤壁在压力作用下易发生片帮,推进速度慢和顶板来压均会造成片帮程度加剧;采高大于4.5 m煤壁片帮显著增加;片帮深度与支架工作阻力呈反比关系,合理支架工作阻力应保持在8 000 k N左右;通过调整采高和推进速度、提高支护质量等技术措施,可有效解决煤壁片帮问题。

For the situation of coal wall spalling on 5310 large mining height face in Chengzhuang Coal Mine of Jincheng Anthracite Mining Group,the influence of five factors,including geological structure,propulsion and shutdown speed,roof weighting,mining heights and working resistance of supports,were analysed through statistical and numerical simulation,technical measures were also put forward. The results show that： the geological structure damaged coal＇s continuity,coal wall under pressure is prone to spalling,slow advancing speed and roof pressure will result in increased spalling degree; coal wall spalling has a significant increase when mining height is higher than 4. 5 m; spalling depth is inversely proportional to working resistance of supports,the working resistance of supports should be remained at around 8000 kN; by adjusting the cutting height and advancing speed,improving the quality of supporting and other technical measures,coal wall spalling problem can be effectively solved.