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1·The effect of basic rock thickness, mining height and advancing speed on roof breaking is analyzed.

并进一步分析了基岩厚度、采高、推进速度对顶板破断的影响。

2·From the theoretical and experimental study, the paper made a brief analysis of the advancing coal mining method affected on coal and gas outbursts.

从理论和试验研究两方面浅析了前进式采煤法对煤与瓦斯突出的影响。

3·The impact factors on advancing supporting speed of hydraulic support are analyzed in this article, and the path and methods to accelerate roof support speed of combined mining face are suggested.

分析了影响液压支架移架速度的因素，提出了加快综采面顶板支护速度的方法和措施。