Abstract: Due to the effects of spectacular geological formations and high in-situ stress, the stratigraphic heave after excavation, roof collapse and floor heave in the coal seam roadway in deep steeply inclined soft rock masses are easy to appear, resulting in extremely difficulty in supporting. Through field exploration and tests of roadway in Xinji Coal Mine No.3 -700 m, this paper proposes a new support scheme by applying steel arch of shoring and unsymmetrical prestressed anchor reinforcement in roadway supporting according to the asymmetric deformation, obvious floor heave and the stratigraphic heave deformation. A numerical model is established by finite element software ABAQUS and is compared with the original support scheme. The results show that the displacement of floor heave decreases by 66%; the largest tensile stress reduces from 0.58 MPa to 0.38 MPa, the plastic zone distribution is much smaller than the original scheme; and stress distribution of supporting structure is more uniform by using the improved support scheme. The study can provide useful references to some similar roadways in deep steeply inclined soft rock mass.

Key words: deep soft rock, steeply inclined coal seam, unsymmetrical loading roadway, support parameter