卸压瓦斯抽采的工作面推进速度敏感性分析  

Sensitivity analysis of longwall panel advancing rate on extraction of pressure relief gas

作　　者：张村 屠世浩 袁永 郝定溢 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院共伴生能源精准开采北京市重点实验室,北京100083 [2]中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2017年第6期1240-1248,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51374200;51404249);江苏高校优势学科建设工程项目

摘　　要：保护层卸压开采过程中,工作面推进速度直接影响着被保护层瓦斯涌出量。为了研究工作面推进速度与卸压瓦斯抽采量的相关关系,以淮南矿区某矿的4个工作面的卸压抽采数据为例分析了工作面推进速度与卸压瓦斯抽采量的相关关系。研究结果表明,保护层工作面推进速度影响着被保护层卸压区范围进而影响着卸压瓦斯抽采量。但由于层间岩体的周期性破断导致被保护层瓦斯涌出量发生波动,降低了卸压瓦斯抽采量与工作面推进速度的相关关系。将工作面推进速度进行了分区以降低工作面周期来压对拟合效果的影响,并给出了卸压瓦斯抽采量的预测公式。各个抽采方式瓦斯抽采源的不同决定着受保护层工作面推进速度影响程度。同时,根据卸压抽采量与工作面推进速度的拟合公式,提出了卸压抽采工作面推进速度敏感因子用以表征推进速度对瓦斯抽采的影响程度。分析表明工作面推进速度对地面钻井抽采、穿层抽采、大直径水平长钻孔抽采及工作面埋管抽采的影响程度逐渐升高。Advancing longwall panel rates directly affect the gas emissions during the protective coal seam mining. In order to illustrate the PRGET performance and associated longwall panel advancing rate consequences, we analyse the gas extraction production data in a Huainan coalfield longwall panel. The results show that the longwall panel advancing rate determines the range of the pressure relief area as well as the pressure relief gas extraction quantity. Due to the periodic breakage of the interlayer be-tween the protected coal seam and the protective coal seam, the gas emission from the protected coal seam varies greatly, which reduce the relationship between the pressure relief gas extraction and the longwall panel advancing rate. The PRGET production performance shows an apparent correlation （correlation coefficient=0.98） between the panel advancing rate and the gas production rate after classi-fication. The linear fitting equation of the advancing and gas extraction rates is obtained to predict gas extractions. The gas extraction source of different extraction methods determines the influence degree of longwall panel advancing rate. Meanwhile, the advancing rate sensitivity coefficient of each PRGET is proposed to evaluate the advancing rate＇s influence degree. It is obvious that the extraction productions of Gob Gas Venthole （GGV） and Crossing Seam Drilling Hole （CSDH） are less influenced by advanc-ing rates comparing to those of Large Diameter Horizontal Long Drilling Hole （LDHLDH） and Buried Pipe in Gob for Extraction （BPGE）. The sensitivity coefficient ascending orders of each PRGET are GGV, CSDH, LDHLDH and BPGE.

关 键 词：卸压抽采 推进速度 速度分区 周期来压 

分 类 号：TD823[矿业工程—煤矿开采]