近水平远距离下保护层开采卸压范围

为了确定晋城矿区保护层开采的卸压保护范围,采用相似模拟、现场实测的方法,研究了保护层开采过程中被保护层的竖向变形规律,得出了保护层开采的有效卸压范围,为相似条件下保护层开采及被保护层巷道布置提供依据。研究表明:保护层开采后,被保护层煤体出现明显的竖向变形,沿工作面推进方向上依次分为压缩区、膨胀区、卸压膨胀区、膨胀区、压缩区;沿煤层上山方向的有效卸压保护角为81.6°,下山方向的有效卸压保护角为79°,走向有效卸压保护角为67.7°;在工作面后方37 m以远,3#煤体膨胀逐渐趋于稳定膨胀值为93 mm,膨胀率为1.55%,煤体卸压充分。

Pressure relief boundary of protected seam mining with subhorizontal long-distance

In order to determine the layer mining relief range of Jincheng mine, adopt similar stimulation and spot-measure methods, study the vertical deformation law of the protective layer during mining, ob- tained protective layer mining efficient relief range, provide basis for protective layer mining and roadway layout. The study shows that there is obvious vertical deformation after protection layer mining, along the advance direction of working face, the deformation area of the protective coal seam was divided into five regions, which were compressive deformation region, swelling region, discharging swelling deformation re- gion, swelling region and compressive deformation region; Along the seam uphill efficient relief protec- tion angle is 81.6° ,downhill angle is 79° ,coal seam strike efficient relief protection angle is 67.6° ; In 37 m beyond the rear face ,3 # coal swelling gradually stabilized expansion is 93 mm ,expansion rate is 1.55 %, coal relief fully.