综放工作面覆岩破坏规律的观测研究

综放覆岩破坏规律,特别是近松散层开采区的实测数据现在还很少。兖州杨村煤矿采用瞬变电磁法对同一工作面的岩柱厚度大于69m的深部开采区和岩柱厚度28~69m的浅部开采区分别进行了采后覆岩破坏两带高度探测,探测结果表明浅部裂缝带高度比深部降低17%~27%,冒落带高度变化不明显。 

EXPLORATION AND RESEARCH ON OVERLAY BROKEN LAW ON MECHANIZATION CAVING MINING FACE

There is a few of measured data of the overlay broken for mechanization caving mining face,especially for the face beneath the unconsolidated lay.The paper introduces the exploration result,by transient electromagnetic method,of the overlay broken on the seam mechanization caving mining face both in the deep district with rock pillar height over 69m and the lower district with the rock pillar height of 28~69m.The results show that the height of the fractured zone in the lower district less 17%~27% than that in the deep district;the variation of the caving zone heights in both districts is not obvious.