Steel tube concrete support applied to dynamic pressure roadway inkilometers deep mine

In order to solve the large surrounding rock deformation value and long sustained deformation time problems occurred in a support process of-1 100 meters level roadway in Huafeng Mine,a site geological survey,theoretical calculation and site monitoring and measuring combined method was applied to analyze the surrounding rock deformation features and roadway stability lost and failure causes. Based on the circumstances ,according to the pressure bearing ring strengthened support theory,the paper provided a high strength composite support method based on the steel tube concrete support. The cross section of the support designed was a semi arch support in an arc form wall.The main frame steel tube was selected with口194 mmx8 mm seamless steel tube and was flled with C40 steel fiber concrete.The bolt-mesh-anchor supp orting and surrounding rock reinforced grouting were applied as the auxiliary support.The study results showed that the support system could provide a support counterforc e over 0.93 MPa to the surrounding rock and could effectively restrain the movement of the surrounding rock forward to the space of the roadway.After the support stabilize d,the final deformation value of the surrounding rock along the roadway was less than 150 mm and could meet the deformation requirement of the roadway.An asymmetry 0 f the surrounding rock structure could cause an asymmetric deformation of the surrounding rock. In combination with the loading force monitoring and measured data of the support,a control of the deformation key part should be enhanced.