工作面初采顶板预裂爆破防治大面积悬顶技术应用

Application of Precracking Blasting Technology to Prevent Large Area Overhanging Roof in Working Face

厚硬顶板工作面初采期间难以随采垮落,造成大面积悬顶,是煤矿开采中常见的安全隐患。采用工作面初采顶板预裂爆破防治大面积悬顶技术,避免2505综放工作面厚硬基本顶在初采期间难以垮落而造成大面积悬顶。通过理论计算,得到2505综放工作面顶板预裂爆破的炮孔布置参数,并进行现场应用。研究结果表明:组内爆破钻孔间距为6 m、组间间距为16 m和垂直处理高度为15.8 m的爆破参数,能够有效破坏厚硬顶板的完整性。爆破后,支架后方顶煤立即垮落,液压支架工作阻力随采呈现周期性变化,后续回采未出现大面积悬顶现象,保障了工作面的安全生产。

Large overhanging roof caused by difficult caving of thick hard roof during initial mining is a common safety hazard in coal mine mining.In order to avoid the heavy and hard basic roof of 2505 fully mechanized caving face which is difficult to collapse during the initial mining period,the gun hole layout para meters of 2505 fully mechanized caving face roof precracking blasting are obtained through theoretical calculation and applied in the field.The results show that the blasting para meters with the spacing of drilling holes within the group is 6 m,the spacing between groups is 16 m,and the vertical processing height is 15.8 m can effectively destroy the integrity of the thick hard roof.After blasting,the top coal immediately collapses behind the support,and the working resistance of the hydraulic support changes periodically with mining.There is no phenomenon of large hanging roof in the subsequent mining process of the working face,ensuring the safe production of the working face.