Key technologies for surrounding rock control in deep roadway

HOU Chaojiong

Abstract：Deep coal occurrence conditions are complicated,and the roadway pressure is more radical.A considerable number of roadways are distributed in crumbly and severely deformed rock mass,coal mass or semi-coal rock body.To tackle the deep roadway failure problem,two prominent difficulties in deep roadway surrounding rock control namely floor heave and creep deformation were elaborated.Related control methods were put forward.The results show that according to the "two point and three-zone" deformation characteristics of floor heave,the depth of floor bolt and grouting hole should be below "zero displacement point" of the floor strata.Together with the rib corner reinforcement,the floor heave can be effectively controlled.Reasonable first and secondary support can be adopted to ensure that the radial stress provided by the anchoring end is greater than that required for roadway creep deformation,which can keep the roadway creep deformation rate within 0.02 mm per day and achieve longterm stability of roadway surrounding rock.The application effect is good in combination with engineering project,which is of great significance to ensure the safe exploitation of deep coal resources.