The reasonable position of the upper protective seam workface is chosen by comparing the distressing effects of the twice simulation experiments of mining the upper protective seam.
比较两次开采上解放层模拟试验的卸压程度，确定了上解放层工作面的合理位置；
This paper analyze the problems of expanding mining caving lightly set-up room with traditional shield support, it took the influence to join caving lightly workface.
分析了在复杂的地质条件下 ，采用传统的架棚支护在扩掘大断面轻放切眼中出现的问题 ，给轻放工作面衔接带来的影响。
This paper analyze the problems of expanding mining caving lightly set-up room with traditional shield support, it took the influence to join caving lightly workface.
分析了在复杂的地质条件下 ，采用传统的架棚支护在扩掘大断面轻放切眼中出现的问题 ，给轻放工作面衔接带来的影响。
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