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1991年9月6日,某矿202南东高档普采工作面发生一起伪顶局部冒落事故。该工作面采用托伪顶开采方式。伪顶为0.3～0.7m的碳质页岩,层状、性脆,强度低,顶板来压后易断裂而脱落。要求煤层采空后,必须及时进行支护,并要求支护具有托起伪顶而不让其在工作面控顶距内发生位移。因此,作业规程规定,工作面落煤后要及时跟机挂梁,打临时支柱和贴帮支柱,空顶距不大于0.4m,支柱顶梁要全部铰接,以控制伪顶。
September 6, 1991, a mine 202 South East high-grade Cape mining face with a pseudo-top local caving accident. The face using pseudo top mining method. The pseudo-top 0.3 ~ 0.7m carbonaceous shale, layered, brittle, low strength, easy to break after the roof pressure and fall off. After the coal seam is required to be emptied, the support must be promptly carried out and the support required to hold the false top without displacement of the coal roof in the controllable roof. Therefore, the operating rules stipulate that the coal face of the coal face shall be timely connected with the hanging beams, the temporary pillars and the posts and pillars, and the distance between the top and the top should be no more than 0.4m. The top pillar of the pillar should be hinged to control the false top.