岩层破坏与移动对地面瓦斯抽放的影响分析

Analysis of impact on surface gas drainage from strata movement and damage

为了研究多煤层联合开采下多采空区相互影响条件下的瓦斯抽放规律,采用理论分析和FLAC3D数值模拟相结合的方法,分析了唐山矿5、9煤层覆岩采动后冒落裂隙发育状况及T2291工作面相邻采空区煤柱裂隙发展及分布特征,揭示了T2291工作面采空区横向方向上贯通了与之相邻的多个采空区和纵向上贯穿了多个煤层现象.研究结果表明,布置在该工作的地面钻孔可同时进行多个采空区和多煤层的瓦斯抽放,提高了钻孔的服务年限及抽放效率.研究结论有助于指导唐山矿在类似区域瓦斯抽放钻孔的布置.

In order to investigate the characteristics of gas drainage under the conditions of multiple seam extractions and multiple goaf drainages,this study uses both theoretical analysis and numerical simulation with FLAC3D software to analyze the development of rock fractures after mining the 5th and 9th coal seams and the development of fractures within coal pillars in T2291 goaf.The analysis shows that the borehole of T2291 penetrates more than one coal seam in longitudinal and horizontal directions.The results show that not only the gas in T2291 goaf and other nearby goafs,but also in other coal seams can be extracted by T2291 borehole.This will significantly increase the efficiency of gas drainage and the service life of T2291 borehole.The study can help to design surface boreholes in a similar area at Tangshan coal mine.