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研究基于实现被保护层倾向充分、连续卸压的下保护层开采展开。分析与实验表明,保护层工作面长度、层间距、卸压边界线与留设煤柱造成的远距离被保护层倾向无法实现卸压、近距离被保护层倾向存在高应力区域或者卸压不充分区域,无法实现被保护层倾向的安全、连续开采。在此基础上,提出使用无煤柱布置被保护层回采工作面,接续工作面回采时上覆岩层的运动与首采工作面形成一个整体,实现了倾斜方向的连续开采长度,覆岩的采动程度更加充分,被保护层在裂隙带中的层位相对降低,卸压程度更加充分,因此无煤柱开采实现了被保护层倾向的充分、连续卸压。结合实际工程背景,综合回采率和巷道工程量考虑,煤2采用无煤柱开采方案比原方案增加回采利润2.84亿元;与5 m小煤柱沿空掘巷相比,减少岩巷工程费用计600万元,增加回采利润1.4亿元。
The research is based on realizing the exploitation of the lower protective layer that has the tendency of sufficient and continuous pressure relief by the protected layer. Analysis and experiment show that the long distance caused by the working face length, interlayer spacing, pressure relief boundary line and the remaining coal pillar can not be relieved by the protection layer. The high-stress region tends to exist in the protective layer at short distance or the pressure relief is not Full area, can not be protected by the tendency of the safe, continuous mining. On this basis, it is proposed to adopt non-coal pillar arrangement to protect the working face, and the movement of the overlying strata during the recovery of the continuous working face forms a whole with the first mining face, realizing the continuous mining length in the inclined direction, The degree of dynamic action is more sufficient. The layers of the protected layer in the fractured zone are relatively reduced and the pressure relief degree is more sufficient. Therefore, the non-coal pillar mining realizes the full and continuous pressure relief of the protected layer. Combined with the actual engineering background, the comprehensive recovery rate and the amount of roadway engineering considerations, the coal-mining method adopted by coal 2 increased the recovery profit by 284 million yuan compared with the original scheme. Compared with 5-m small coal pillar driving along gob-side entry, the project cost of rock roadway was reduced Calculated 6 million yuan, an increase of 140 million yuan mining profits.