急斜特厚煤层开采方法转变顶板垮落及防治

急斜特厚煤层的开采在中小型煤矿一直沿用大放高非机械化开采方式，造成采区回采率低下，煤损严重。由于目前的煤炭效益越来越好，许多原有的地方煤矿开始进行采煤方法的改革，其中在从房柱式开采向综放开采转变过程中出现的顶板垮落现象直接危害到工作面的安全生产。文中通过相似模拟实验对此进行了研究，得出控制顶板垮落动力灾害的关键在阶段煤柱的留设。

The collapse and control of steep dip thick seam roof with change of the mining method

High top-coal non-mechanized mining method was always adopted in the exploitation of steep dip thick coal seam in small to middle coal mine, which induced low proportion of extraction in section and coal loss was serious. Recently benefits of coal mines become more and more better, many local coal mines begin to reform the original mining method, among those changes, roof fall arose from room-and-pillar mining to fully mechanized mining directlythreaten the safety of production. To control the dynamic disaster, the similar imitate experiment was used in this thesis to gain the key technology, which isto control the size of the remained crown pillar.