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合理的工作面长度是指适应于一定的矿山地质条件及技术组织水平从而使采矿工作获得最好的技术经济指标的工作面长度。自1953年来,开滦各矿回采工作面平均长度虽有显著的增长(见表1),但就长度仍然是落后于矿山技术水平及机械化程度增长的速度。在1955年上半年,开滦有约70％的煤是自倾斜及缓斜一次采全厚回采工作面中采出的(见表2),因之合理的决定出这些回采工作面的长度具有着深切的国民经济意义。
The reasonable working face length refers to the working face length adapted to certain mine geological conditions and technical organization so that the mining work can obtain the best technical and economic indexes. Since 1953, although the average length of mining face in Kailuan Mine has increased significantly (see Table 1), the length is still lagging behind the technological level of mines and the growth rate of mechanization. In the first half of 1955, about 70% of the coal produced in Kailuan was extracted from inclined and gently inclined fully mechanized mining face (see Table 2), which reasonably determined that the length of these mining face has With profound national economic significance.