No.2 Underground Mine, China Coal Pingshuo Group Ltd. Administration of Safety, China Coal Pingshuo Group
Ltd.

为了解决工作面初次来压垮落步距过大问题,针对平朔井工二矿11号煤层赋存情况及开采技术条件,通过利用基本顶固支岩梁力学模型,对该矿11号煤层首采工作面基本顶初次垮落步距进行了分析和计算,提出了在工作面开切眼中采用顶板深孔预裂爆破弱化的方法,减小工作面初次来压的垮落步距。现场矿压监测与分析结果表明,顶板经过弱化处理后初次来压步距仅为15.6 m,从而减小了采空区顶板悬露面积,有效防止了该工作面顶板大面积来压的发生,保证了近距离煤层开采中下位煤层首采工作面初采期间的安全回采。

In order to solve the problem of large initial caving step, the deep hole presplitting blasting technology had been used in interconnection of mining face t 0 decrease the initial caving step. According to the natural situations and the mining technical conditions of No. 11 coal seam in No. 2 Underground Coal Mine of Pingsh u0, the initial main roof caving step of initial mining face was calculated based on the mechanical model which the main roof was regarded as a clamped rock beam. Th e pressure detection and analysis results showed that the first collapse step was merely 15. 6 m after weakening processing and hanging area of the main roof above g oaf was reduced, which meaned the danger of large pressure while the roof caved was prevented effectively. The safety during downward mining the initial mining face i n the underlying seam of contiguous seams had been ensured.

国家自然科学青年基金资助项目(51104151)；