Abstract: When the stope route in -140 m level of No.1 mining area in Dazhuohe Iron Mine has been excavated,part of the roadway surrounding rock is continuously contracted inward and characterized by creep property,which caused certain security hidden danger to the normal production and management of the mine.In order to analyze the deformation mechanism of roadway surrounding rock,the situ test is conducted in stope route roadway in the middle section of No.1 mining area,the suitable creep model is selected based on the test data curve characteristics of circular roadway.According to the viscoelastic creep displacement formula,the parameters required by the model are deduced by adopting Origin software.The rheological behavior of the built-in creep model is modified by increasing or decreasing the parameters of the built-in model in FLAC3D software,so as to conform to the variation regularity of the measured curve obtained by roadway creep test.The creep deformations of roof,floor and both sides of roadway surrounding rock are simulated and analyzed based on the creep parameters obtained by the evolution of the measured curve of circular roadway,and the comparison and analysis of them are conducted.The study results show that the displacement curves of them are similar with each other,which further indicated that the obtained data of this paper has certain value,and the creep deformation analysis of circular roadway surrounding rock can be done effectively by the evolution of viscoelastic parameters based on the method proposed in this paper.

Key words: Soft rock roadway, Creep parameter, Direct screening method, FLAC3D, Numerical simulation