摘要
采用理论分析和数值模拟手段深入研究8210工作面特厚煤层放顶煤开采对地表变形的影响。理论分析表明按照完全放顶煤的方式,地表呈现"漏斗"状下沉曲线,地表下沉量为3.8m^7.0m,最大下沉量高差为3.2m,地表变形严重。按照只采底煤不放顶煤的方式,地表下沉量为1.4m^2.1m,最大下沉量高差为0.7m,减少的幅度各为75.3%、78.1%。采用了数值模拟进行了验证,地表呈现"驼峰"状下沉曲线。因此,可以在8210工作面采用不放顶煤的方式来减少对地表建筑物的影响。
The effect of top coal caving on the surface deformation in No. 8210 working face with extra-thick coal seam was studied by theoretical analysis and numerical simulation. The theoretical analysis results show that, if the complete top coal caving is adopted, the severe surface deformation occurs, presenting a funnel-shaped subsidence curve. Besides, surface subsidence ranges from 3.8 to 7.0 meters and the maximum height difference of subsidence is 3.2 meters, if we mine floor coal without the top coal caving, the surface subsidence ranges from 1.4 to 2.1 me- ters and the maximum height difference is 0.7 meters, dropping by 75.3% and 78.1 respectively. The numerical simulation is used to validate the results, which show a hump-shaped subsidence curve. In conclusion, mining without the top coal caving on No. 8210 working face could reduce the mining effects on surface buildings.
作者
张林
李吉世
ZHANG Lin LI Jishi(Madaotou Mining Co. , Ltd. , Datong Coal Mine Group, Datong 037001, China)
出处
《山西煤炭》
2017年第3期8-11,共4页
Shanxi Coal
关键词
特厚煤层
放顶煤
地表变形
extra-thick coal seam
top coal caving
surface deformation
