上保护层开采卸压保护范围研究

秦汝祥; 杨珂; 程健

doi:10.13272/j.issn.1671-251x.2021050028

上保护层开采卸压保护范围研究

doi: 10.13272/j.issn.1671-251x.2021050028

秦汝祥^1,2,
杨珂²,
程健³

1. 煤矿安全高效开采省部共建教育部重点实验室, 安徽淮南 232001;
2. 安徽理工大学安全科学与工程学院, 安徽淮南 232001;
3. 淮南矿业集团有限责任公司潘二煤矿, 安徽淮南 232001

基金项目:

国家自然科学基金面上项目（51574009）。

详细信息

作者简介:
秦汝祥(1975-),男,江苏高邮人,教授,博士,现主要从事矿井通风安全技术研究工作,E-mail:309374919@qq.com。

中图分类号: TD712
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出版历程
- 收稿日期: 2021-05-12
- 修回日期: 2021-10-25
- 刊出日期: 2021-11-20

Research on the protection range of pressure-relief in the mining of upper protective layer

1. Key Laboratory of Safe and Efficient Coal Mine Mining, Ministry of Education, Huainan 232001, China;
2. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China;
3. Pan'er Coal Mine, Huainan Mining Group, Huainan 232001, China

摘要

摘要: 目前保护层卸压范围研究主要集中在分析煤层应力、变形和塑形破坏的演化特性及下保护层开采卸压范围，存在对保护层保护效果的考察较少、实测过程中取点较少造成实验结果误差较大等问题。针对以上问题,以淮南矿业集团有限责任公司潘二煤矿18125工作面为研究对象，采用数值模拟计算和现场考察分析方法研究了保护层开采后被保护层的应力分布、煤层顶底板膨胀变形率和煤层瓦斯压力变化特征。结果表明：① 被保护层走向垂直应力呈中心轴对称分布，倾向卸压区表现为类椭圆形。② 上保护层工作面开采后，在其底板形成地应力卸压区，底板煤岩层应力减小，卸压区煤岩层向上发生移动和变形，由于保护层和被保护层层间距不同，被保护层移动与变形量存在差距，越靠近开采层，被保护层膨胀变形量越大，被保护层卸压效果越明显。保护层工作面后方30～60 m是被保护层卸压抽采瓦斯的最佳区域。③ 根据瓦斯压力观测钻孔与保护层工作面初切眼位置的相对关系及瓦斯压力观测结果，得到保护层开采走向最大有效卸压角约为69.8°。④ 通过数值模拟并结合现场考察分析，根据被保护层应力分布、煤层顶底板膨胀变形率和煤层瓦斯压力变化特征，得出被保护层走向卸压角约为60°，倾向上下部卸压角均为75°。
- 瓦斯抽采 /
- 保护层开采 /
- 上保护层 /
- 被保护层 /
- 卸压范围 /
- 应力分布 /
- 煤层瓦斯压力
Abstract: At present, the research on the protective layer pressure relief range mainly focuses on the analysis of the evolution characteristics of coal seam stress, deformation and plastic failure and the pressure relief range of the lower protective layer mining.There are few investigations on the protective layer protection effect, and more error of experimental results caused by less points taken in the actual measurement process.In order to solve the above problems, taking the 18125 working face of Pan'er Coal Mine of Huainan Mining Group as the research object, the stress distribution of the protected layer, the expansion and deformation rate of the coal seam roof and floor and the change characteristics of coal seam gas pressure after the mining of the protective layer are studied by numerical simulation calculation and field investigation and analysis methods.The results are listed as follows.① The vertical stress in the direction of the protected layer is symmetrically distributed along the central axis, and the tendency pressure relief zone is elliptical.② After the mining of the upper protective layer working face, the crustal stress relief zone is formed on its floor, the stress of the floor coal rock layer is reduced, and the coal rock layer in the pressure relief zone moves upwards and deforms.Due to the different spacing between the protective layer and the protected layer, there is a gap between the movement of the protected layer and the amount of deformation.The closer to the mining layer, the greater the expansion and deformation of the protected layer, and the more obvious the pressure relief effect of the protected layer.30-60 m behind the working face of the protective layer is the best area for pressure relief and gas extraction of the protected layer.③ According to the relative relationship between the gas pressure observation borehole and the position of the initial cutting hole of the working face of the protective layer and the gas pressure observation results, the maximum effective pressure relief angle of the mining direction of the protective layer is about 69.8°.④ Through numerical simulation and combining with field investigation and analysis, according to the stress distribution of the protected layer, the expansion and deformation rate of the roof and floor of the coal seam and the change characteristics of the coal seam gas pressure, it is concluded that the pressure relief angle of the protected layer is about 60°, and the pressure relief angles of both the upper and lower tendency are 75°.
- gas extraction /
- protective layer mining /
- upper protective layer /
- protected layer /
- pressure relief range /
- stress distribution /
- coal seam gas pressure

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参考文献(15)

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