大采高工作面末采阶段联合注浆加固技术

Application of Joint Grouting Reinforcement Technology in the End Mining Project of Large Mining Height Working Face

针对寺河矿大采高工作面末采阶段矿压显现剧烈,易出现片帮、冒顶,进而影响液压支架顺利撤出的问题,采用新型无机注浆材料对距主撤架通道后40m范围煤体进行超前预加固,并在撤架通道开采侧煤体局部地区补注少量有机注浆材料的联合注浆加固技术,有效解决了大采高工作面末采阶段片帮、漏顶等难题,实现了工作面与主撤架通道的安全快速贯通。通过对末采时间和末采注浆成本的对比分析,联合注浆加固较单纯使用有机材料注浆加固获得了更好的经济效益。

In view of the great mining height of the Shihe Mine,the mining pressure at the end of the mining stage appeared severely,easily leading to the occurrence of the film gang,the top of the situation,affecting the smooth withdrawal of the hydraulic support further. A new inorganic grouting material was used in advance pre-reinforcement of coal body within 40 meters from the main draw-off passage. In addition,a small amount of organic grouting material was refilled in local areas of the mining side of the withdrawal channel. The application of the joint grouting reinforcement technology effectively solved the problems such as chipping and leaking at the final mining stage of large mining face, and realized the safe and rapid penetration of the working face and the main withdrawal channel. By comparing the final mining time and the grouting cost at the end,the joint grouting reinforcement achieved better efficiency and benefit than simply using organic material grouting reinforcement.