The distribution law of inner stress field and its effect on controlling underground impact pressure are discussed, when sub-level caving method is introduced.
讨论了放顶煤开采的采场应力场的分布规律及其对冲击地压的控制作用。
Sub-level caving is an efficient and safe mining method.
无底柱分段崩落采矿法是一种高效安全的采矿法。
It adopt dry filling method in the orebody above -350m level and adopt the method of sublevel caving in the orebody under the level. Exploitation engineering already reach -385m level.
目前- 350水平以上还在采用干式充填法还在出矿，- 350水平以下采用无底柱分段崩落法，已开采到- 385水平。
It adopt dry filling method in the orebody above -350m level and adopt the method of sublevel caving in the orebody under the level. Exploitation engineering already reach -385m level.
目前- 350水平以上还在采用干式充填法还在出矿，- 350水平以下采用无底柱分段崩落法，已开采到- 385水平。
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