Deep buried thin bedrock layer with different mining heights and mining pressure manifestation in working faces and slope prevention and control technology
In view of the problems of deep coal seam,thin bedrock,thick loose layer and poor roof conditions in Zhaogu No.2 Coal Mine,taking the No.11050 working face of Zhaogu No.2 Coal Mine as the engineering background,using theoretical analysis,numerical simulation,and on-site measurement methods,the distribution characteristics of supporting pressure and the evolution law of plastic zone in No.11050 working face under different mining heights were studied.The research results indicate that under different mining height conditions,stress concentration occurs in front of the coal wall.As the mining height increases,the peak stress point gradually shifts towards the depth of the coal wall,and the range of influence also gradually increases.As the mining height increases,the range of the plastic zone of the direct top and basic top of the coal mining face gradually increases.On-site measurements showed that increasing the mining height would lead to an increase in the depth of coal wall spalling,and a series of measures were proposed to prevent coal wall spalling.The research can provide guidance for the safe and efficient mining of Zhaogu No.2 Coal Mine.
deep buried thin bedrockcoal wall spallingplastic zonelarge mining height
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