Abstract:In order to study the depth and failure mode of the plastic zone in the excavation process of a vertical shaft, a study was conducted on the depth and failure mode of the plastic zone in the surrounding rock of a certain metal mine in the 1000-1200m section of the well engineering through geological investigation, theoretical analysis, numerical simulation, on-site testing and other technical means. The results show that the engineering geological conditions in the 1000-1200m section are good, and the depth of damage to the surrounding rock of the wellbore is 2.94m at 1000m, 2.23m at 1100m, and 2.45m at 1200m, respectively. Further theoretical calculations and numerical simulations were conducted to determine the failure mode of the surrounding rock of the wellbore, all of which were determined to be ear shaped failure. By studying the forms and depths of wellbore damage during excavation, scientific basic parameters can be provided for the lining and support of the surrounding rock of the wellbore, ensuring safe and reliable excavation of the wellbore.
