An Analytical Model for the Excavation Damage Zone in Tunnel Surrounding Rock

An accurate theoretical model to predict the extent and mechanical behavior of excavation damage zone (EDZ) in surrounding rock deep-buried tunnel is great importance for practical engineering applications. Using elastic-plastic theory combined with analysis on stress characteristics rock, this paper present a EDZ formation evolution. A three-zone composite was established surround corresponding state displacement field three zones were derived. The effects strain softening dilatancy during deformation taken into account. correctness proposed validated by existing models. sensitivity different influencing factors also performed. results can benefit future numerical experimental studies.