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针对花山矿５２１３西工作面这一特大冒顶事故，通过对工作面顶板压力，从老顶失稳的两种形式（滑落、变形失稳）入手分析，工作面由于支护密度不合理是造成工作面老顶初次来压发生“压垮型”冒顶的主要原因
In view of the special roof caving accident of 5213 West Face of Huashan Coal Mine, by analyzing the roof pressure of the face and starting from the two forms of the instability of the old roof (sliding and deformation instability), the working face due to the unreasonable support density The main reason why the top of the old face pressured to the top for the first time came under pressure