Based on the theory of continuum damage mechanics, a modified Mohr-Coulomb failure criterion according to plastic damage evolution and the seepage-stress coupling is applied to analyze the excavation damage of Boom clay influenced by the evolution of pore pressure and plastic strain. Considering the actual case of the construction of the connecting gallery for the feasibility study of radioactive waste disposal in the deep Boom clay formation in Belgium, a nonlinear finite element damage model for simulating shield tunneling is proposed in order to study the evolution of damage, pore pressure and permeability of the surrounding rock. The variations of damage and permeability around the tunnel with time are analyzed in detail. The presented method can provide the references for the influence of tunnel drainage on geological environment and creep process analysis of surrounding rock.
|Journal||Rock and Soil Mechanics|
|State||Published - Jan 2009|