大倾角煤层俯斜开采顶板破坏机理研究  

Experimental Study on Roof Failure Mechanism in Dip Mining of Large Inclination Coal Seam

作　　者：林东才[1] 王冠赵 栾恒杰[1] 贾传洋[1] 代猛猛 

机构地区：[1]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《煤炭工程》2015年第5期98-100,共3页Coal Engineering

摘　　要：以葛亭煤矿2317工作面大倾角煤层俯采采场为研究对象,采用相似材料模拟和理论分析的方法研究了顶板运动规律、采场覆岩离层的产生、直接顶破坏规律以及基本顶结构动态演化规律。结果表明:大倾角俯斜开采基本顶初次来压步距约50m,周期来压步距约25m,比同等条件下工作面沿倾向布置时的来压步距较长;采场离层带呈"锐角三角形状",离层由下位岩层开始产生,形成组合结构向上有规律地运动;直接顶不规则冒落的岩石滑向工作面,对工作面不利,同时使原来是基本顶的岩层在工作面推进到一定距离后变成了直接顶,使直接顶位置上移,基本顶结构发生明显运动的区域主要处于倾斜中上部,其在垂直岩层层面内顶板的破断和运动是稳态的,并沿倾向向上位岩层发展呈"阶梯状"。Taking the dip mining stope of large inclination coal seam in 2317 working face of Geting Coal Mine as research object, the movement laws of roof, the stope overburden bed separation, immediate roof damage rules and the dynamic evolution rules of basic roof structure were studied, using similar material simulation and theoretical analysis. The results show that, the roof weighting interval is longer under dip mining, compared with mining along strike, the first weighting interval of basic roof is 50m and the periodic weighting interval is 25m; stope overburden bed separation is in acute triangle shape, which develops from the lower strata, forms composite structure and moves regularly upward ; the irregular caving rock of immediate roof slides to working face, and the basic roof turns into immediate roof as working face advances to a certain position, obvious movement area of basic roof structure is mainly in upper part along the dip, the breakage and movement of basic roof structure in the vertical strata is steady, and basic rock beams develop to the upper strata along the dip showing ＂ stair - step＂ tendency.

关 键 词：大倾角煤层 俯斜开采 覆岩离层 垮落形态 基本顶结构 

分 类 号：TD82[矿业工程—煤矿开采]