工作面上覆岩层蠕变活动对支架工作阻力的影响

Effect of overburden strata creep activities on working face support resistance

针对工作面推进速度对支架工作阻力有较大影响的实际情况,特别是在工作面非生产期间,支架工作阻力并没有维持不变,而是在缓慢增阻,没有相关理论解释这种现象。对比岩石蠕变曲线和在非生产期间支架工作阻力曲线的相似性,通过岩石蠕变特性和理论模型,分析不同时期(检修、长时间停产)支架工作阻力"蠕变"特性,并以崔木煤矿21305工作面为研究对象,采用西原简化模型分析了支架阻力与时间的关系。研究结果表明:检修期间和长时间停产期间支架工作阻力与时间关系符合简化西原模型蠕变方程,且不同支架间拟合曲线具有较强的一致性,说明工作面非生产期间,顶板蠕变活动是影响支架工作阻力的主要因素之一;拟合曲线相关度较高,说明通过该理论利用已有数据可以较为准确预测支架工作阻力(在同一循环内)。研究结果解释了工作面推进速度影响支架工作阻力的原因。

According to the influence of advance speed of working face on support working resistance,especially during the non-productive period of working face,support working resistance does not remain unchanged,but slowly increases. Currently there has been no theory to explain this phenomenon. Based on the creep characteristics and theoretical models of rock,and by contrasting the similarity of creep curve of rock and support working resistance curve during the non-productive period,this paper analyzed the support working resistance ＂creep＂characteristics at different stages（ production,maintenance,long-time off production）. By studying No. 21305 working face in Cuimu Mine,China,the paper also fitted the relationship between support working resistance and time. It indicates that the creep equations and fitting curves of Nishihara simplified model have a strong consistency during the period of maintenance and long-time off production. This indicates that if off production time is longer,the influence of roof creep activities on support working resistance is more obvious. Fitting curve correlation is relatively high. By using existing data,this theory can accurately predict future support working resistance（ in the same circle）. The results explained the influence of working face advance velocity on support working resistance.