摘要
本文以现场实测为基础,系统分析了缓斜特厚煤层放顶煤综采工作面两侧煤体的位移活动规律及其影响因素,其结论对于在缓斜特厚煤层放顶煤综采工作面实行沿空掘巷的无煤柱开采、减少煤炭损失、提高采区回采率等方面具有重大的指导作用。
Based on the field observations, thepaper systematically analysed the dis-placement regularity of coal ribs by both sides of a fully mechanized coal face withtop coal caving in gently inclined extrathick seam and its effective factors. It con-siders that the displacement of the coal ribsby both sides of the face is affected by theprocess of coal extraction, supportsshifting, top coal caving and roofmovement. Along with the advancement offace, the displacement of coal ribs may bedivided into multiple stages. The maximumdisplacement rate of both ribs near the topcoal caving line is up to 12-20mm/d,while the average in the gob is10-14mm/d. As for the horizontal dis-placement rate of the top coal along thedip, there is a dividing line at 4m on theuphill side of the lower gateway. In front offace the horizontal displacement rate of topcoal is higher by the gateway side than bythe face side, while behind the face line, it ishigher by the gob side than by the rib side.The displacement by the uphill side is larg-er than that by the downhill side. Along thedip, the caving angle of the top coal byboth uphill and downhill sides arerespectively 66°and 64°. They are sosmall that it is unfavorable to top coal cav-ing. When a roadway should be driven inthe previous gob, it should be done till thesurrounding rocks stopped moving and thestress distribution in it had been steady,and the roadway should be located in thestress relieved zone.
出处
《矿山压力与顶板管理》
1993年第3期185-191,243,共7页
Ground Pressure and Strata Control
