After many rounds of gas extraction and through layer boreholes in the bottom pumping roadway of Cheji coal mine,the surrounding rocks of the roadway produces more cracks leading to poor sealing of the drilling holes,which affects the effect of gas extraction.In view of the problem,curtain grouting technology was selected to reinforce the roadway.Firstly,a numerical model of solid coal rock borehole grouting was established by COMSOL Multiphysics software.Then,according to the numerical simulation results,the diffusion law of the grouting slurry in the crack rock was analyzed,and the suitable grouting scheme was designed.Finally,the experimental research of the drilling integrated curtain grouting and grouting integrated sealing grouting process was carried out in the field.The results show that curtain grouting measures can effectively seal the cracks and increase the gas extraction concentration.Compared with the non-curtain grouting drilling holes,the average initial pumping concentration of a single hole in the test borehole increases by 9.4 percentage points,and the average re-pumping concentration of a single hole increases by 14.5 percentage points.This technology provides a technical reference for curtain grouting projects in similar mines.
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