冲击危险性厚煤层综放开采冲击地压发生机理

基于冲击地压对深部综放开采工作面安全高效生产的严重影响性,采用有限差分软件FLAC3D研究采煤方法(包括大采高开采)对冲击地压形成的不同影响作用,分析综放开采的合理采放比及综放工作面冲击地压发生的机理。研究表明对于冲击危险性特厚煤层采用综放开采是有利于冲击地压防治。支承压力集中程度仍然超过塑性区煤体强度极限和采空区以暂时稳定梁或者其它形式积聚了大量的弹性能量的瞬间释放是综放工作面冲击地压时有发生的原因。

Mechanism of rock outburst occurred from fully mechanized longwall top coal caving and mining in thick seam with rock outburst danger in potential

Base on the rock outburst could have a serious influences to the safety production of the fully mechanized top coal caving and mining face in deep mine,a finite differential software FLAC3D was applied to study the different influences of the mining method(including high cutting mining) to the formation of the rock outburst.The paper analyzed the rational mining and caving ratio and the mechanism of the rock outburst occurred in the fully mechanized caving and mining face.The research showed that application of the fully mechanized caving and mining could be favorable to prevent and control the rock outburst in special thick seam with rock outburst danger.The support pressure concentrated degree higher than the strength limitation of the coal mass in the plastic zone and the instant releasing great elastic energy accumulated in the temporary stable roof or other structure of goaf is the cause to occur the rock outburst in the mining face.