Research on Prediction and Control of Initial Drawing Pressure Intensity in 1302 Face of Yuxi Coal Mine
In order to effectively control the pressure of 1302 fully mechanized caving face at the first stage of the first caving in Yuxi Coal Mine,through theoretical analysis,empirical formula calculation,engineering analogy,industrial test and other means,the prediction of the mining pressure development strength of the roof and reasonable control technology were carried out.The results show that the initial pressing step of the basic top of the working face is about 25.8 m,and the top cutting pressure relief control is needed.The optimum hydraulic fracturing technology is used to pre-cut the top.The water pressure change curve and the water discharge of the surrounding borehole during fracturing show that the fracturing effect is good and the initial compressive strength can be significantly weakened.
the first pressurefully mechanized caving facehydraulic fracturing
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