The balance structure of main roof and its action to immediate roof in large cutting height workface;

本文分析了顶板运动对冲击矿压的作用，采用“砌体梁”理论研究了断层倾向对顶板平衡结构的影响。

This paper introduces that tilting prevention support group is developed and applied result in inclined seam workface.

介绍专为倾斜煤层采煤工作面研制的单体防倒组合支架及其应用效果。

Because gas drainage is strong in 3308 workface of Chengzhuang coal mine, stop production often takes place for above-the-common.

成庄煤矿3308综放面由于瓦斯排放量大，多次造成因瓦斯超限停产。

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。

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；

The reason of the spontaneous combustion at fully mechanized workface with top caving are analyzed. The comprehensive preventing measures are elaborated. The good effect is obtained.

对综采放顶煤工作面自燃发火的原因进行了分析，阐述了所采取的综合性预防措施，及取得了良好的效果。