Analysis of stress state in mine shaft lining, taking into account superficial defects

The article presents the results of numerical modeling of mining shaft lining while taking into account defects of its surface. The simulations were carried out for 64 variants, including various widths and depths of cavities in the lining. The results of the simulation are presented as distributions of the minimal principal stress and strength factor. The analysis of the obtained results allowed to indicate characteristic places in the cross-section of lining which were exposed to tensile stress. The article also analyzed the influence of the width and depth of the defects on the occurrence of tensile stress and the increase of strength factor in the lining.