China Coal Pingshuo Group Company Limited

为实现近距离特厚煤层协同开采,以平朔矿区4号和9号煤层为研究对象,采用理论分析、数值模拟和现场观测的方法,确定工作面放煤工艺参数、巷道布置方式、巷道支护方式、区段煤柱尺寸及终采线位置。结果表明:9号煤层综放工作面采用一刀一放、分段、两轮顺序放煤可提高煤炭采出率2.1%;9号煤层工作面在加强巷道支护的基础上采用内外错组合巷道布置方式,可有效防止工作面片帮冒顶事故的发生;4号煤层工作面区段煤柱尺寸不小于17 m且终采线距主要巷道50 m时,有效保证4号煤层大巷及9号煤层水仓的稳定性。

In order to realize the coordinated mining in contiguous ultra thick seams, taking No. 4 and No.9 seams in Pingshuo Mining Area as the study objects, th e theoretical analysis, numerical simulation and the site observation method were applied to determine the top coal caving parameters of the coal mining face, gateway layout mode, gateway support mode, sectional coal pillar size and terminal mining line location. The results showed that the fully-mechanized top coal caving mining fac e in No.9 seam with one cutting and one caving, sectional and twice sequence top coal caving could improve the coal mining recovery rate by 2.1%. Based on the enh anced gateway support of the coal mining face in No. 9 seam, an internal and external dislocated combined gateway layout mode applied could effectively prevent the C oal wall spaling and roof falling accident occurred. When the sectional coal pillar size of the coal mining face in No.4 seam was not less than17 m and the terminal min ing line had a distance of 50 m to the mine main roadway, thus the stability of the mine roadway in No.4 seam and the water bunker in No. 9 seam could be effectively ensured.