铁新煤业坚硬厚层K_(2)灰岩顶板强制放顶技术研究

Study on forced caving technology of hard thick layer K_(2)limestone roof in Tiexin Coal Industry

为解决铁新煤业9号煤层综采工作面端头处K_(2)灰岩顶板悬而不垮的问题,以9226工作面开采为工程背景,开展坚硬厚层K_(2)灰岩顶板强制放顶技术研究。根据9226工作面实际条件进行压裂钻孔参数设计,提出了小孔径定向预裂施工方案,并通过钻孔窥视和工作面端头悬顶长度来监测评价预裂控顶效果。实践表明,9226工作面端头处悬顶距由压裂前的10~30 m减小为5 m以内,悬顶问题得到有效治理,保障了工作面生产安全。

In order to solve the problem of K_(2)limestone roof hanging at the end of fully mechanized mining face in No.9 coal seam of Tiexin Coal Industry,taking No.9226 Face mining as the engineering background,the forced caving technology of hard and thick K_(2)limestone roof is studied.According to the actual conditions of No.9226 Face,the parameters of fracturing drilling are designed,and the construction scheme of small aperture directional pre-splitting is put forward.The effect of pre-splitting and roof control is monitored and evaluated by drilling peep and the length of hanging roof at the end of working face.The practice shows that the suspended roof distance at the end of No.9226 Face is reduced from 10~30 m before fracturing to less than 5 m,and the suspended roof problem is effectively controlled to ensure the production safety of the working face.