近距离煤层坚硬顶板控制高度研究

Study on Control Height of Hard Roof in Short Distance Coal Seam

针对I010203工作面顶板活动剧烈、冲击危险性高、顶板控制高度不明的问题,采用理论计算、数值模拟、微震监测、钻孔窥视的研究方法,综合确定了近距离煤层坚硬顶板控制高度,优化了近距离煤层坚硬顶板控制高度参数,开展了顶板控制效果工程验证。研究表明,4种研究方法确定的顶板垮落带分别为27~32、44、43、28~47 m,综合考虑垮落带高度和裂隙带高度影响的防冲控制范围,确定坚硬顶板合理处理高度为40 m;优化了I010203工作面坚硬顶板深孔预裂爆破确定的控制高度,开展了I010203工作面顶板深孔预裂爆破工程实践,有效减小了I010203工作面坚硬顶板大能量微震事件活跃高度及强度,降低了I010203工作面冲击危险性,验证了确定的I010203工作面顶板处理高度的合理性。

In view of the problems of intense roof activity,high impact risk and unknown roof control height in I010203 working face,the control height of hard roof in close distance coal seam is comprehensively determined by using the research methods of theoretical calculation,numerical simulation,microseismic monitoring and borehole peeping,the control height parameters of hard roof in close distance coal seam were optimized,and the engineering verification of roof control effect was carried out.The research shows that the roof collapse zones determined by the four research methods are 27-32 m,44 m,43 m and 28-47 m respectively.Considering the impact of the height of the collapse zone and the height of the fracture zone,the reasonable control height of the hard roof is 40 m;the control height determined by deep hole presplitting blasting of hard roof in I010203 working face is optimized,and the engineering practice of deep hole presplitting blasting of roof in I010203 working face was carried out,which effectively reduced the active height and intensity of large energy microseismic events of hard roof in I010203 working face,reduced the impact risk of I010203 working face,and verifies the rationality of the determined roof treatment height of I010203 working face.