复合水体下特厚煤层综放开采安全性研究  

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

作　　者：李磊[1,2] 李德军 LI Lei;LI De-jun(China Coal Research Institute,Beijing 100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;Jalainur Coal Mining Co.,Ltd.,Hulun Buir 021412,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工开采研究院有限公司,北京100013 [3]扎赉诺尔煤业有限责任公司,内蒙古呼伦贝尔021412

出　　处：《煤炭工程》2021年第5期1-6,共6页Coal Engineering

基　　金：华能集团总部科技项目“灵东煤矿Ⅱ3特厚煤层开采防溃水溃砂技术研究”资助(HNKJ20-H29)。

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。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 mining under the composite water body of Linglu Coal Mine is taken as an example,in which theⅡ3 extra-thick coal seam in the first mining district is under the goaf water ofⅡ2-1 coal seam and the ground subsidence water.Both engineering analogy and theoretical analysis are used,the damage height of the overlying strata in fully mechanized caving mining,and the height of the water-proof pillars for waterproof,sand control and collapse prevention are calculated.Based on the difference between the distance between the water area and the mining coal seam and the height of the safe coal rock pillar,the Kriging difference method is used 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.The threat of the roof composite water body in the first mining area II3 is comprehensively analyzed,and finally x the safety of fully mechanized caving mining under composite water body is evaluated.The research results show that:mining in first mining district can meet the requirements for water-proof pillars in surface subsidence water.With the water-proof pillars,comprehensive water prevention and control measures of geophysical prospecting and drilling exploration water drainage,the safety is ensured for fully mechanized top coal caving of extra-thick coal seam under composite water bodies.

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 

分 类 号：TD823.4[矿业工程—煤矿开采]