摘要
Abstract
In view of the existing problems of poor coal pillar stability,low excavation efficiency,insufficient support strength and others during the 08 working face wind roadway excavation process in Xinji No.2 Mine,based on the theories of seepage mechanics and fracture mechanics,a comprehensive solution is proposed.A cement-water glass double liquid slurry pre-reinforcement system is designed,and a coal pillar-surrounding rock coupling support model is constructed;Renovation and upgrading are conducted on the excavation system,Equipment performance is improved by adopting XCMG-H85 hard rock cutting pick paired with KCS-35 forced internal cooling system;Based on the surrounding rock deformation characteristics,a three-step support process of"temporary support-anchor mesh support-spray mixing"is constructed.Through 3 months of on-site practice,the deformation rate of the coal pillar is reduced from 1.2 mm/d to 0.3 mm/d,the cutting pick life of the roadheader is extended from 32 h to 125 h,the single cycle operation time is shortened from 185 min to 135 min,the monthly footage is improved to 305 m,and the single meter excavation cost is reduced by 2850 yuan.The results show that this technical system effectively solves the existing problems in the excavation process,achieves safe,efficient,and rapid excavation,and provides technical reference and engineering demonstration for roadway excavation under similar conditions.关键词
新集二矿岩巷/掘进工作面/快速掘进/工艺研究Key words
Xinji No.2 Mine rock roadway/excavation working face/rapid excavation/process research分类
矿山工程
