采矿与安全工程学报
採礦與安全工程學報
채광여안전공정학보
JOURNAL OF MINING AND SAFETY ENGINEERING
2013年
4期
538-541,547
,共5页
浅埋旺采工作面%厚层坚硬顶板%能量平衡%时间差
淺埋旺採工作麵%厚層堅硬頂闆%能量平衡%時間差
천매왕채공작면%후층견경정판%능량평형%시간차
shallow Wongawilli face%thick-hard roof%energy balance%time difference
神东矿区浅埋深厚层坚硬顶板地质条件和旺采工艺致使工作面采空区顶板极易形成大面积悬顶,当工作面一个区段刚刚回采至极限面积时,厚层坚硬顶板可能会大面积垮落造成设备损坏、人员伤亡。论文运用断裂力学理论,从裂纹扩展的能量平衡观点出发,推算出了理想状态下,无爆破扰动的情况下,厚层坚硬顶板旺采面采空区达到极限面积之后顶板从破坏到垮落的最短时间,为厚硬顶板合理控制提供了理论依据。
神東礦區淺埋深厚層堅硬頂闆地質條件和旺採工藝緻使工作麵採空區頂闆極易形成大麵積懸頂,噹工作麵一箇區段剛剛迴採至極限麵積時,厚層堅硬頂闆可能會大麵積垮落造成設備損壞、人員傷亡。論文運用斷裂力學理論,從裂紋擴展的能量平衡觀點齣髮,推算齣瞭理想狀態下,無爆破擾動的情況下,厚層堅硬頂闆旺採麵採空區達到極限麵積之後頂闆從破壞到垮落的最短時間,為厚硬頂闆閤理控製提供瞭理論依據。
신동광구천매심후층견경정판지질조건화왕채공예치사공작면채공구정판겁역형성대면적현정,당공작면일개구단강강회채지겁한면적시,후층견경정판가능회대면적과락조성설비손배、인원상망。논문운용단렬역학이론,종렬문확전적능량평형관점출발,추산출료이상상태하,무폭파우동적정황하,후층견경정판왕채면채공구체도겁한면적지후정판종파배도과락적최단시간,위후경정판합리공제제공료이론의거。
The geological condition of shallow thick-hard roof is very common in Shendong mining area, which would be particularly conductive to form a large area hanging roof especially when the Wongawilli production practice is adopted. If one of the working face sections stopped to limit area, large-area caving zone will come into being on the thick-hard roof, which will result in casualties and equipment damage. In this paper, fracture mechanics theory is adopted to study the cracking of thick-hard roof. Based on energy balance in the process of crack extension, the minimum duration from initiating cracking to large area caving of thick-hard roof on Wongawilli face under ideal conditions without blasting disturbance is derived, and it provides a theoretical basis for reasonable control of thick-hard roof.