煤炭工程 ›› 2021, Vol. 53 ›› Issue (5): 1-6.doi: 10.11799/ce202105001

• 设计技术 •    下一篇

复合水体下特厚煤层综放开采安全性研究

李磊,李德军   

  1. 中煤科工开采研究院有限公司
  • 收稿日期:2020-08-24 修回日期:2020-11-11 出版日期:2021-05-20 发布日期:2021-05-17
  • 通讯作者: 刘义新 E-mail:hnlglyx@163.com

Safety of fully mechanized caving mining in extra-thick seam under surface and aquifers waters

  • Received:2020-08-24 Revised:2020-11-11 Online:2021-05-20 Published:2021-05-17

摘要: 为解决采空区和地表塌陷积水组成的复合水体下综放开采安全性问题,以灵露煤矿一采区Ⅱ3特厚煤层所面临的由Ⅱ2-1煤层采空积水和地面塌陷积水组成的复合水体下开采为例,采用工程类比和理论分析相结合的方法,计算得出了综放开采覆岩破坏高度以及防水、防砂和防塌安全煤岩柱高度|基于采空区积水区和开采煤层之间的距离与安全煤岩柱高度的差值,采用克里格差值法分别绘制了采空区积水对开采煤层充水、溃砂和防塌的影响图,综合分析了一采区Ⅱ3受顶板复合水体威胁情况,最终评价了复合水体下综放开采的安全性。研究结果表明:一采区开采能满足对地表塌陷积水留设防水安全煤岩柱的要求,地表塌陷水体下特厚煤层综放开采是安全的|对复合水体采取留设安全煤岩柱,物探和钻探疏放水相结合等综合防治水技术措施后,复合水体下综放开采是安全可行的。

关键词: 复合水体, 特厚煤层, 综放开采, 水体下开采, 覆岩破坏高度, 安全煤岩柱

Abstract: In order to solve the safety problem of fully mechanized caving mining under the compound water body composed of goaf and ground subsidence water, the II3 extra-thick coal seam in the first mining area of Linglu Coal Mine is faced by the II2-1 coal seam mined water and ground subsidence water. Take the mining under the composite water body as an example. Using the method of combining engineering analogy and theoretical analysis, the damage height of the overlying strata in fully mechanized caving mining, as well as the height of the coal and rock pillars for waterproof, sand control and collapse prevention are calculated; The difference between the distance between the water area and the mining coal seam and the height of the safe coal rock pillar, using the Kriging difference method to draw three maps of the influence of the water in the goaf on the water filling, sand break and collapse prevention of the mining coal seam. Comprehensively analyzed the threat of the roof composite water body in the first mining area II3, and finally evaluated the safety of fully mechanized caving mining under the composite water body. The research results show that: mining in a mining area can meet the requirements for water-proof and safe coal and rock pillars in surface subsidence water; fully-mechanized caving mining in extra-thick coal seams under surface subsidence water is safe; combined geophysical prospecting and drilling to determine the mined-out area volume After the water has been drained, the safe mining of the submerged water in the goaf can be realized; after the composite water body is taken to leave safe coal and rock pillars, combined with geophysical and drilling, and carry out comprehensive water prevention and control measures such as drainage of the water in the goaf, Fully mechanized caving mining under complex water bodies is safe and feasible.