Research on the roof control technology during 12-317 working face crossing overlying goaf in Huojitu well
In order to ensure the stability of the roof during the process of the working face crossing the overlying goaf,taking 12-317 working face of Huojitu Well in Daliuta Coal Mine as the engineering background,a technical means of using flexible mold pumping pillars to support the roof of the goaf was proposed,and numerical simulation was used to analyze the stress distribution of the surrounding rock at different periods of the working face crossing the overlying goaf.The results showed that after using flexible mold pumping pillars in the external cutting hole goaf,the stress distribution of the surrounding rock during the passage of the working face through the goaf was uniform,and there was no stress concentration phenomenon.The subsidence of the roof was significantly reduced,ensuring safe and efficient production during the 12-317 fully mechanized mining face crossing the overlying goaf.
crossing the overlying goafworking face supportnumerical simulationeffect assessment
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