通过阅读大量有关资料，结合义马耿村煤矿的现场实测，并参考其他放顶煤工作面的观测成果，探讨了综放开采顶煤变形及破断规律。
By reading large relative data, combining actual measurement in Gengcun mine, Yima, and consulting observation of other top coal caving face, authors discussed distortion and rupture...
利用上述规律，可以对顶板破断的过程及其强度进行有效的评价和预测。
With above rules, the process and intensity of roof fracture and pressurization can be evaluated and predicted effectively.
利用上述规律，可以对顶板破断的过程及其强度进行有效的评价和预测。
With above rules, the process and intensity of roof fracture and pressurization can be evaluated and predicted effectively.
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