Abstract
Underground tunneling is one of the alternative solutions to diminish traffic congestion in large cities. One of the most important effects of tunneling is the displacement of the ground surface, the settlement around the tunnel, and the variation in earthquake acceleration. The performance and behavior of underground structures have been studied by several researchers, but the impact of tunnel excavation on earthquake records and its effects on structures above the ground level have received less attention. This research emphasizes changes of earthquake acceleration at the ground level, structural response and Fourier spectrum by excavating a horseshoe tunnel. Results show that digging a horseshoe tunnel will change the characteristics of the earthquake record at ground level.
Highlights
Tunnel construction has been recognized as a substantial approach to reduce traffic congestion and ease of public transportation due to the population growth in urban areas and the urgent need for public and green transportation amenities
In both tunnel-free and tunnel-like conditions, earthquake records are applied to the soil mass and the soil surface record is extracted by dynamic analysis that was done in PLAXIS software
The soil surface record is given to the SeismoSignal software and the acceleration spectrum of the structure is drawn by a Single Degree of Freedom (SDOF system) for each earthquake record
Summary
Tunnel construction has been recognized as a substantial approach to reduce traffic congestion and ease of public transportation due to the population growth in urban areas and the urgent need for public and green transportation amenities With this outlook, considerable studies have been done by various researchers, on the impacts of tunneling, tunneling stability, and tunnel-structure interaction, most of which tried to anticipate the settlement of the ground around the tunnels, which were experimental, analytical and numerical. Baziar et al (2014) investigated the effects of a rectangular tunnel on ground surface acceleration using experimental and numerical models; by applying sine records (sine accelerograms) and actual ground motion records, they have concluded that the rectangular tunnels would respectively decrease and increase the short time-periods and long time-periods. Tunnel, earthquake records and structures a series of specifications are used as follows
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