Abstract:

This research is to provide theoretical basis for the deformation calculation and stability analysis of roadway under seepage action. The analytical solution of circular roadway's surrounding rock stress field, and the expression of surrounding rock's permeability coefficient were put forward in consideration of intermediate principal stress based on DruckerPrager criterion and Damage Mechanics. Moreover, the relation of permeability coefficient  K  vs. pore water pressure  p  , and K   vs. radius  r of surrounding rock's plastic zone were obtained. Results showed that within the damage area, permeability coefficient  K decreased nonlinearly with the increase of  r , while increased exponentially with the rise of pore water pressure p . 

Key words: Drucker-Prager criterion, damage variable, intermediate principal stress, permeability coefficient, pore water pressure