Research and Application of Roof Pressure Relief and Gas Control Methods for 8208 Working Face in a Certain Mine in Shanxi
This article takes the 8208 working face of a certain mine in Shanxi as the research object.Due to the large thickness of its coal seam and high roof strength,and the impact of the overlying strata,during the mining process of the working face,the roadway beyond the front section will undergo severe coal wall compression deformation,large overall roof subsidence,and significant floor heave,resulting in insufficient sectional dimensions of local roadways,ventilation,and pedestrian difficulties.Thereby affecting the normal recovery of the working face.In order to ensure the smooth advancement of the working face,combined with the geological and actual economic conditions of the mine,a method of combining medium and shallow hole hydraulic fracturing and deep hole blasting roof cutting pressure relief was proposed.In order to prevent gas exceeding the limit,corresponding control measures have been proposed.The results show that after the roof of 8208 working face is depressurized,the roof can collapse normally,the suspended roof area is significantly reduced,the rock pressure is not obvious,there is no significant deformation in the roadway,the control is good,and there is no gas exceeding the limit.
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