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一、前言 为正确估计瓦斯和岩石突出的危险程度,必须弄清有突出危险煤层的矿山地质条件,从而选用适当的开采方法和顶板管理方法。顶板管理方法对支承压力作用下的弹性-可塑区中的煤层和围岩的形变特点,对突出危险程度之主要参数的确定均有很大影响。 大量实践资料证实了一些文章提出的假说,即在未卸压的突出危险煤层中,长壁工作面采用顶板全冒落比干式充填安全得
I. INTRODUCTION In order to correctly estimate the dangerous degree of gas and rock outburst, the geological conditions of the mine with prominent dangerous coal seam must be clarified so as to select the appropriate mining method and roof management method. The roof management method has a great influence on the deformation characteristics of the coal seam and surrounding rock in the elastic-plastic zone under supporting pressure and on the determination of the main parameters that highlight the degree of danger. A large number of practical data have confirmed the hypothesis put forward by some articles that in the unsealed, extremely dangerous coal seam, the long-wall working face adopts the roof full caving to be safer than the dry filling