Aiming at the problem of large deformation and difficult maintenance in the overrun section of 9-301 comprehensive workface of Pangpangta coal mine,we consider using grouting anchor instead of the traditional monolithic for overrun support,and use Comsol numerical simulation software to find out the reasonable parameters of the grouting anchor as follows:grouting pressure is 4 MPa,the grouting time is 400-800 s,and the grouting anchor spacing is 2.5 m and the row spacing is 2 m.The field observation results show that the grouting anchor has been optimised for the overrun section of the coal mine.The field observation results show that the cumulative roof subsidence of the roadway in the overrun section is controlled within 400 mm,and the stability of the surrounding rock is good,which ensures the safety and high production of the working face.
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