| 深部低渗透强突出煤层群首采下保护层确定和效果考察 |
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| 引用本文： | 程详,赵光明,孟祥瑞,李英明.深部低渗透强突出煤层群首采下保护层确定和效果考察[J].中国安全生产科学技术,2016,12(10):18-23. |
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| 作者姓名： | 程详 赵光明 孟祥瑞 李英明 |
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| 作者单位： | 程详，赵光明，孟祥瑞，李英明 |
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| 摘 要： | 软岩保护层在深部低渗透强突出煤层群首采保护层选择中具有潜在的应用前景。在阐述下保护层开采覆岩移动与采场裂隙演化及瓦斯运移关系的基础上,以芦岭矿为工程背景,通过FLAC3D数值试验,研究软岩保护层开采后的卸压效果,并和不同层位的薄煤层开采卸压效果对比分析。结果表明,在采厚相同的情况下,开采10煤保护层相对于软岩保护层,卸压程度弱,保护范围小,保护效果差。软岩保护层开采后,被保护层处于弯曲下沉带的下限范围。受采动影响,有大量的离层裂隙生成。考察期范围内上覆被保护层(8、9煤层)瓦斯抽采率达62.9%,表明软岩保护层开采能够对上覆被保护层(8、9煤层)起到显著的卸压效果。研究结果可为其他矿区保护层开采选择提供参考,丰富国内保护层开采实践。
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| 关 键 词： | 深部 软岩保护层 卸压增透 效果考察 数值模拟 |
Determination and effect investigation on the first mining lower protective
layer in deep coal seam group with low permeability and strong outburst |
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| CHENG Xiang,ZHAO Guangming,MENG Xiangrui,LI Yingming.Determination and effect investigation on the first mining lower protective
layer in deep coal seam group with low permeability and strong outburst[J].Journal of Safety Science and Technology,2016,12(10):18-23. |
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| Authors: | CHENG Xiang ZHAO Guangming MENG Xiangrui LI Yingming |
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| Affiliation: | Key Laboratory of Mining Coal Safety and
Efficiently Constructed by Anhui Province and Ministry of Education,
Anhui University of Science and Technology, Huainan Anhui 232001, China |
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| Abstract: | The soft rock protective layer has the potential application prospect in the selection of
first mining protective layer for the deep coal seam group with low permeability and strong outburst.
The relationship of the overlying strata movement in lower protective layer mining with the stope
fracture evolution and gas delivery was discussed. On this basis, taking the Luling Mine as engineering
background, the pressure relief effect after the soft rock protective layer mining was studied through
FLAC3D numerical tests and compared with the pressure relief effect of thin coal seam mining in
different position. The results showed that when the mining thickness was same, compared with the soft
rock protective layer, the degree of pressure relief was weaker, the protection range was smaller, and
the protection effect was worse for mining No.10 coal protective layer. After the mining of soft rock
protective layer, the protected layers were in the lower limit range of bending subsidence zone. Large
amount of delamination fracture generated by the influence of mining. The gas extraction rate of
overlying protected layer (8, 9 coal) can reach 62.9% during the investigation period, which indicated
that the mining of soft rock protective layer could play a significant pressure relief effect for the
overlying protected layers (No.8 and 9 coal seam). The results can provide references for selection of
protective layer mining in other mining areas, and enrich the practice of protective layer mining in
China. |
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| Keywords: | deep soft rock protective layer pressure relief and permeability enhancement effect investigation numerical simulation |
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