Abstract

Considering the changes of permeability and Biot’s coefficients, the closed-form elastic-brittle-plastic solution of lined circular tunnels was proposed employing a Mohr-Coulomb non-associated flow rule. The influence of the reserved deformation of lining structure, permeability and Biot’s coefficients on the plastic radius, displacement and water inflow was studied. With an increase in permeability of the plastic region, the plastic radius and displacement decrease, and the water inflow increases. With an increase in Biot’s coefficient, the plastic radius, displacement and water inflow approximately increase in a linear way. The pore-water pressure in the surrounding rock increases with decreasing permeability of lining structure, and the water inflow has a contrary evolution. The increasing reversed displacement of lining structure increases the plastic radius, and lining structure reduces the water inflow but increases the pore-water pressure of the surrounding rock.

摘要

考虑渗透率和Biot系数的变化，采用Mohr-Coulomb非关联流动法则，提出了衬砌圆形隧道的封闭式弹脆塑性解。研究了衬砌结构预留变形、渗透率和Biot系数对塑性半径、位移和进水量的影响。随着塑性区渗透率的增加，塑性半径和位移减小，进水量增加。随着Biot系数的增加，塑性半径、位移和进水量大致呈线性增加。围岩孔隙水压力随着衬砌结构渗透率的降低而增加，而进水量则相反。