青岗坪煤矿42104综放面矿压显现规律及支架工作阻力研究.pdfVIP

27m. There was participation of the upper main roof from the beginning of the second period weighting. The periodic weighting average increment of load coefficient was 1.36, and the degree of strata behavior was moderate. Support working resistance monitoring showed that reasonable working resistance of support should be controlled in 8000kN, and supporting distance ahead of working face should achieve the range of 45m in front of the coal wall. Field observation had showed that the main foof first weighting step was 57.5m, periodic weighting average step distance was 26.4m, and the working resistance of selecting 6800KN is reasonable. Referring to similar materials simulation experiment and taking into account the rocks basically belong to semi hard rocks, at the same time, considering universal applicability of support, the working resistance of support should remain in 8000KN at Qing gang ping coal mine. Research conclusions provided a useful reference for subsequent working and support resistance improvement.at Qing gang-ping coal mine. Keywords: Fully Mechanized Top Coal Caving Mining ； Plate Breaking ； Strata Behavior ；Reasonable Working Resistance ；Situ Monitoring Thesis : Applying Research 万方数据 目 录 目 录 1 绪论 ····································································································1 1.1 论文选题背景 ··············································································· 1 1.2 论文研究的目的和意义 ···································································· 2 1.3 国内外研究现状 ······························