强震区软弱围岩矩形隧道减震层不同布置范围的减震效果OA

In order to improve the safety of shallow buried rectangular tunnels with weak surrounding rocks when subjected to strong earthquakes,a comparative analysis of the seismic damping effect of rec-tangular tunnels with different damping layer arrangements is carried out using the finite element soft-ware ABAQUS.The results show that compared with the condition without damping layer(condition 1),after adding the segmental structure,the damping effects of condition 2(cushion damping layer),con-dition 3(semi-covered damping layer),and condition 4(full-covered damping layer)were significantly improved,and condition 3 had the best damping effect.Compared with condition 1,the maximum princi-pal stress peak,minimum principal stress peak,maximum shear stress,maximum lateral displacement,maximum vertical displacement,and minimum safety factor of the damping effect in condition 3 increased by 8.893%,13.433%,5.698%,15.190%,41.860%,and 27.590%respectively.In seismic design,a semi-covered seismic damping layer construction scheme is recommended.