SEISMIC RESPONSE ANALYSIS OF UNDERGROUND TUNNEL DUE TO EARTHQUAKE LOAD USING PSEUDOSTATIC AND DYNAMIC ANALYSIS

• Main Author: Kushandayani, Annisa
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/86320
• Institution: Institut Teknologi Bandung

With the development of underground structures in urban areas with high levels of seismicity, it is important to consider earthquake loads on the seismic response of tunnels. The evaluation of the seismic response of underground tunnel structures can be conducted by observing tunnel deformations in response to ground deformations. To determine tunnel deformations under earthquake loading, various methods can be used, such as pseudo-static analysis and time history dynamic analysis. This study evaluates the seismic response of a circular tunnel in an urban area. A parametric study was conducted using a two-dimensional (2D) finite element program to examine the influence of different parameters, such as site class and earthquake intensity, on the deformation of the underground circular tunnel. Various analysis methods were evaluated to assess their applicability, which can be used as recommendations for design practice. Based on the parametric study, it was found that the stiffer the site class, the larger the diametric change of the tunnel. Additionally, the greater the earthquake intensity, the larger the diametric change of the tunnel. In the case study, the soil flexibility ratio of site class SE was smaller compared to soils in site classes SD and SC. The pseudo-static analysis method resulted in smaller diametric changes of the tunnel compared to the dynamic analysis method, but the opposite was observed when considering the internal forces of the tunnel.