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1 基本情况义马煤田的2-1煤、2-2煤及部分2-3煤的煤层厚度大都为4～5m,倾角10°～15°,顶板为泥质页岩或砂质页岩。为解决厚煤层开采问题,自1984年就开始酝酿选用大采高液压支架,对这类煤层实行一次采全高,经过反复的调研及技术论证,于1987年选定了QY350-25/47二柱掩护式液压支架,于1987年10月在耿村矿12061工作面安装投产。工作面走向长670m,倾斜长120m,储量57万t,煤层厚度4.3～5.2m,倾角14°～16°,局部最大17°～18°,直接顶板为厚层泥质页岩,厚约20m,煤层底板为砂岩。工作面内有一走向斜交断层,与工作面呈25°左右交角,落差3.5～4.0m,自工作面下巷出露后沿工作面推进方向延展200m左右,在
1 Basic Conditions The coal seams of 2-1 coal, 2-2 coal and some 2-3 coal of Yima Coalfield are mostly 4 ~ 5m thick and have a dip angle of 10 ° ~ 15 °. The roof is shaly shale or sandy shale. In order to solve the problem of thick seam mining, since 1984, brewing large mining high hydraulic support, the implementation of this type of coal seam mining full height, after repeated research and technical feasibility studies, in 1987 selected QY350-25 / 47 two columns Cover hydraulic support, in October 1987 in Gengcun 12061 face installation and commissioning. The working face is 670m long, inclined to 120m with a reserve of 570,000 t. The thickness of coal seam is 4.3 ~ 5.2m, dip angle is 14 ° ~ 16 ° and local maximum is 17 ° ~ 18 °. The direct roof is thick shale shale with a thickness of about 20m The coal floor is sandstone. There is a syncline dip in the work surface, and the working surface is about 25 °, with a gap of 3.5-4.0m. After the work surface is exposed from the roadway, it extends along the working face and extends about 200m.