A Design Method for Row Spacing Between Pressure Relief Boreholes
A design method and support pressure technology, applied in calculation, instrumentation, geometric CAD, etc., can solve the problems of increasing the amount of drilling engineering, unfavorable coal and rock mass stability, and the lack of pressure relief effect of row spacing
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[0031] refer to Figure 1~6 The present invention is described, a method for designing the row spacing between pressure relief boreholes, the method is divided into three steps:
[0032] (S1) The application site of pressure relief drilling in coal mines is generally located in the working face, roadway and its adjacent positions. Before designing the row spacing between pressure relief drilling holes, it is first necessary to evaluate the stress environment at the pressure relief site and calculate the supporting pressure of the surrounding rock of the working face or roadway Peak σ p and its position L p . For the peak bearing pressure σ of the surrounding rock of the working face p and its position L p The calculation method is shown in formulas (1) and (2), according to the working face mining height m, side pressure coefficient A, coal internal friction angle Coal internal cohesion c, stress concentration coefficient k, average body force γ of overlying strata, buri...
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