Seismic Vulnerability Analysis of the Shallow-buried Shield Tunnel in Soft Soil Stratum
(1 Department of Geotechnical Engineering, Tongji University, Shanghai 200092; 2 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092)
Abstract：
Taking a typical shallow-buried tunnel in soft soil stratum as an example, corresponding dynamic finite
element model is established using the software ABAQUS to carry out a series of nonlinear time-history analyses.Seismic vulnerability analysis of the typical shallow-buried tunnel is conducted considering the uncertainties of site soil layer, input seismic wave and the impact of soil-structure contact effect, corresponding curve is obtained, and a contrastive analysis between this curve and existing similar vulnerability curves is carried out by taking the ratio of load bearing capacity to bending moment of lining section as damage index. The results show that the softer the soil layer, the higher the seismic vulnerability, highlighting the significant role of local soil conditions in the vulnerability analysis of tunnel. The seismic vulnerability curve quantitatively describes the probability of structural performance level of the shallow-buried tunnel under different earthquake intensities, which can provide reference and
basis for the similar tunnel in terms of seismic performance analysis, loss evaluation and risk assessment.
2020, Vol. 57 