Abstract
AbstractThe paper compares the performance of two FEM approaches in reproducing the response of bare frame structures to tunneling in dry dense sand. A fully coupled approach, in which the tunnel, ...
Highlights
The increasing need for efficient and high-capacity transportation systems in urban areas is boosting the construction of new tunnels worldwide
The performance of the simplified Analysis of Structural Response to Excavation (ASRE) model for both linear elastic EL and elastoplastic EP conditions is compared with the centrifuge data of the F2t3b6L frame founded on the raft
The building settlement shape is reproduced reasonably well by both the EL and EP analyses. This is confirmed by the comparison of the bay β values along the building length, with ASRE results providing a satisfactory estimate of experimental outcomes, and only a marginal difference between EL and EP results
Summary
The increasing need for efficient and high-capacity transportation systems in urban areas is boosting the construction of new tunnels worldwide. Modern mechanized excavation techniques, such as those based on closed face TBMs with pressurized shields, usually limit tunneling-induced soil deformations and, the potential damage to structures and services, both above-ground and buried. Problems can arise in the case of unexpected stratigraphic changes, technical malfunctioning or errors in TBM driving, consideration of more conservative scenarios of TBM performance is recommended for the sake of safety. Traditional excavation techniques, generally associated with larger volume losses, are unavoidable in specific scenarios, e.g. for connection or platform tunnels. In the context of tunnel-soil-building interactions, reliable predictive models are essential for optimum design. Compared to commonly employed simplified and often over-conservative approaches, interaction models should provide more accurate predictions of the ground response at different levels of volume loss, accounting explicitly for the characteristics of the buildings, including their foundation system and possible material non-linearity
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