基于德鲁克-普拉格准则的围岩损伤区渗透系数研究

利用损伤力学，考虑了中间主应力作用，应用德鲁克-普拉格准则，推导了圆形巷道围岩应力场的解析解，给出了围岩渗透系数的表达式，并对孔隙水压力和围岩塑性区域半径与渗透系数之间的关系进行了研究。研究表明：在损伤区域范围内，渗透系数 K随着r 的增加呈非线性减小，随着孔隙水压力 p 的增大呈指数增加。研究成果可为巷道在渗流作用下变形破坏计算及稳定性分析提供理论依据。

Permeability Coefficient of Damage Zone of Surrounding Rock Based on Drucker-Prager Criterion

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 .