Seismic isolation effect of foamed concrete layer along the longitudinal direction of a mountainous tunnel

摘要: Foamed concrete is widely used in seismically isolated tunnels. As a linear underground structure, research on seismic isolation of the tunnel along longitudinal direction very important. However, few studies have been conducted effect foamed layer mountainous To study tunnel, crushable foam plasticity constitutive model with volumetric hardening was adopted to simulate and rate dependence behavior concrete. Then, three-dimensional finite element analyze layer. The results show that absorbs shear strain transmitted from surrounding rock, through its own deformation, reducing influence rock deformation lining.