Numerical simulation analysis of the stability of the surrounding rocks in the deep vertical shaft of the West Anshan Iron Mine
Aiming at the problem of shaft surrounding rock deformation and failure caused by auxiliary shaft excavation in West Anshan Iron Mine,based on the auxiliary shaft excavation at the depth of 700 m to 1 000 m,the three-dimensional numerical analysis of vertical shaft excavation process is car-ried out by using FLAC3D finite difference simulation software,and the evolution characteristics of shaft surrounding rock deformation and failure caused by auxiliary shaft excavation at different depths are expounded.The stress and displacement release law of surrounding rock under the support effect of shaft driving face in the process of auxiliary shaft driving is revealed,and the evolution mechanism of elastic strain energy accumulation,migration and release of shaft surrounding rock induced by aux-iliary shaft driving is obtained.The study shows that during the excavation of the auxiliary shaft,the failure mode of the plastic zone of the surrounding rock of the shaft is mainly shear failure,and the range of the plastic zone increases with the increase of the depth of the shaft excavation,and the peak value of the maximum principal stress is located at the junction of the elastic and plastic zone of the surrounding rock of the shaft.The radial displacement of wellbore surrounding rock increases linearly with depth,the maximum radial displacement is 90.64 mm,and the displacement of surrounding rock in the direction of minimum horizontal principal stress is larger than that in the direction of maximum horizontal principal stress.With the increase of shaft driving depth,the stress release rate of shaft surrounding rock at 2 m above the shaft heading face reaches 95％,and the radial displacement of shaft surrounding rock increases nonlinearly with the increase of distance from shaft heading face,and reaches the maximum at 24 m from shaft heading face.Affected by the excavation disturbance,the elastic strain energy density of the surrounding rock of the shaft increases nonlinearly,and the possi-bility of rockburst is predicted according to the rockburst criterion.
deep shafthigh stressstability analysisdeformation and failureevolution law
万方数据
维普
