基洛夫矿务局各矿山,用不同方案的分段崩落法开采采矿技术条件复杂的富铁矿床,用深孔大量崩矿,并在崩落的覆盖岩石下放矿。目前开采工作在800～900m 深处进行。在400～500m 深处开采时,顶板岩石发生大量崩落,崩落达到地表,形成塌陷漏斗。从此,开采中地压显现强烈,顶板废石(滑石页岩)进入采场,从而造成了极大因 Various mines in the Kirov Mines Bureau use different schemes of subsided caving methods to exploit complex iron-rich deposits of mining conditions, extensively collaborate with deep holes, and deposit them under caving rock cover. The current mining work at depths of 800 ~ 900m. When mined in the depth of 400 ~ 500m, a large number of roof rock avalanches, collapse to the surface, forming collapse funnel. Since then, the pressure of mining has become so intense that roof waste rock (talc shale) enters the stope, resulting in a great cause