Optimization of gob ventilation boreholes design in longwall mining

作     者：Saqib Ahmad Saki Jürgen F.Brune Muhammad Usman Khan Saqib Ahmad Saki;Jürgen F. Brune;Muhammad Usman Khan

作者机构：University of Engineering and Technology LahoreLahore 54890Pakistan Colorado School of MinesGoldenCO 80401USA 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2020年第30卷第6期

页      面：811-817页

核心收录：

学科分类：0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 

基　　金：the Colorado School of Mines thankfully acknowledges all financial support from the NIOSH under contract number[200-2009-31409] 

主　　题：Longwall mining Explosive gas zones Computational fluid dynamics Gob ventilation boreholes 

摘      要：Gob ventilation boreholes(GVBs)are widely used for degasification in *** coal *** on geological conditions,30–50%of methane can be recovered from longwall gob using GVBs.A NIOSH funded research at the Colorado School of Mines confirmed that GVBs can efficiently reduce methane at the ***,GVBs can also draw some fresh air from the face and create explosive gas zones(EGZs).Explosive gas mixtures may be formed in gob areas due to the increased ingress of oxygen from *** is critical to identify the locations for GVBs for maximizing extraction of methane and minimizing hazards of *** study analyzes the effect of operating parameters and design of GVB on methane extraction,EGZs formation,and face and tailgate methane *** extraction,formation of EGZs,and concentration of methane in working areas are significantly impacted by various *** factors include the distance of work face and tailgate from GVBs,diameter of GVBs,vacuum pressure of wellhead,GVB distance from the roof of the coal seam,and number of operating GVBs in a *** fluid dynamics(CFD)evaluations suggest optimal design and operating parameters of GVBs that can contribute to maximum benefits with minimum risks.