Ground Behavior Due to Tunnel Excavation with Existing Foundation

Behavior of Ground and Response of Existing Foundation Due to Tunneling

“…The position of the applied dead load is depicted at the top of theˆgures. It is seen in theseˆgures that the maximum surface settlement occurred underneath the building load, and it was larger than that of the greenˆeld condition in the same way as was observed in tests with the trap door apparatus by Shahin et al (2004a) and Sung et al (2006). For the applied amount of building load, the strip foundation tilted in the opposite direction of the excavation.…”

“…In the elastoplastic analyses, the results showed a good agreement with the results of the model tests in the tunnel excavation, including proper consideration of the existing building loads. The same constitutive model described well the 3D eŠects on the earth pressure and the displacements (Shahin et al, 2004b) and the in‰uence of the existing foundation on the ground behavior (Sung et al, 2006) due to the tunnel excavation under 3D conditions. Therefore, theˆnite element analysis, in which the elastoplastic stress-strain behavior of the soil and the construction process are properly taken into consideration, is a powerful tool for the prediction of ground movements and earth pressure in tunneling.…”

“…The bottom of the iron table, over which the mass of aluminium rods was placed, had ten moveable blocks used in the trap door tunnel experiments (Nakai et al, 1997; Shahin et al, 2004a;Sung et al, 2006). The reason for using this type of base was to adjust the initial stress conditions of the ground in such a way that the stress distribution would become similar to that of the ground without a tunnel (K0 stress conditions for the mass of aluminum rods).…”

“…This experiment was later improved to investigate the eŠect of the existing building load, simulated by a loaded plate, and the results of the numerical analyses showed that the constitutive model can precisely reproduce the observed patterns of surface settlement and earth pressure under two-dimensional conditions, as demonstrated by Nakai et al (2005). Sung et al (2006) showed the capability of the constitutive model to predict the general patterns of ground behavior in model tests with existing piled and non-piled raft foundations.…”

Interaction of tunneling and existing structure considering the location of foundation

“…To investigate the influence of shallow tunneling on existing building, two-dimensional (2D) model tests and the corresponding elastoplastic finite element analyses have been carried out (Shahin et al, 2004;Sung et al, 2006. It was revealed that the tunneling influences on the settlements of the foundations and the earth pressure distribution around the tunnel.…”