摘要
针对塔山煤矿8230综放工作面三角区坚硬顶板悬顶致灾问题,通过分析悬顶形成机理,提出采用二氧化碳预裂爆破技术进行顶板控制。设计了包含放煤孔(KA1)和切顶孔(KB1-KB3)的差异化钻孔布置方案,采用F-57型致裂器实现长钻孔分段致裂。工程应用表明,致裂后端头三角区垮落步距由40 m降至18 m,初次来压步距由78 m缩短至35 m,降幅达55%;巷道顶底板收敛变形减少48.3%,有效避免了悬顶突垮引发的飓风灾害。研究成果为坚硬顶板条件下综放工作面安全开采提供了技术参考。
Aiming at the problem of hard roof overhanging in the triangle area of 8230 fully mechanized caving face in Tashan Coal Mine,by analyzing the formation mechanism of overhanging,the carbon dioxide pre-splitting blasting technology is proposed to control the roof.A differential borehole layout scheme including coal caving hole(KA1)and roof cutting hole(KB1-KB3)was designed,and F-57 type fracturing device was used to realize long borehole segmented fracturing.The engineering application shows that after fracturing,the caving step distance of the end triangle area is reduced from 40 m to 18 m,and the initial weighting step distance is shortened from 78 m to 35 m,with a decrease of 55%.The convergence deformation of the roof and floor of the roadway is reduced by 48.3%,which effectively avoids the hurricane disaster caused by the sudden collapse of the suspended roof.The research results provide a technical reference for the safe mining of fully mechanized caving face under the condition of hard roof.
作者
贺振金
He Zhenjin(Jinneng Holding Coal Group Tashan Coal Mine,Datong 037003,China)
出处
《煤炭与化工》
2025年第11期123-126,131,共5页
Coal and Chemical Industry
关键词
综放开采
坚硬顶板
悬顶致灾
二氧化碳致裂
fully mechanized caving mining
hard roof
suspended roof disaster
carbon dioxide cracking
