Centrifuge seismic tests on small-scale physical models of tunnel in sandy soil are herein reproduced with a numerical calculation to investigate the simulation capability of a numerical model. The soil behavior under monotonic and cyclic loading is simulated fitting laboratory tests with a hypoplastic constitutive model (von Wolffersdorff 1996) coupled to the intergranular strain concept (Niemunis & Herle 1997). Four centrifuge tests have been back- analyzed, reproducing the combinations of tunnel at two depths in two different soil densities. The results from the numerical analyses are compared with those obtained from the tests and with other numerical simulations previously performed in a round robin tests. The simulation proves able to capture observations and to well reproduce ground deformation in all cases. Afterwards, a parametric analysis has been performed modifying the Coulomb friction coeffi- cients at the soil-lining interface to show the relevance of this parameter on the stresses mobil- ized in the lining.
Numerical simulation of centrifuge seismic tests on tunnel in sandy soil / Ochmański, M.; Delli Carpini, M.; Salvatore, E.; Modoni, G.; Bilotta, E.. - (2019). (Intervento presentato al convegno 7th International Conference on Earthquake Geotechnical Engineering, (ICEGE 2019), June 17-20, 2019, Rome, Italy tenutosi a Roma (Italy) nel 17-20 June 2019).
Numerical simulation of centrifuge seismic tests on tunnel in sandy soil
E. Bilotta
2019
Abstract
Centrifuge seismic tests on small-scale physical models of tunnel in sandy soil are herein reproduced with a numerical calculation to investigate the simulation capability of a numerical model. The soil behavior under monotonic and cyclic loading is simulated fitting laboratory tests with a hypoplastic constitutive model (von Wolffersdorff 1996) coupled to the intergranular strain concept (Niemunis & Herle 1997). Four centrifuge tests have been back- analyzed, reproducing the combinations of tunnel at two depths in two different soil densities. The results from the numerical analyses are compared with those obtained from the tests and with other numerical simulations previously performed in a round robin tests. The simulation proves able to capture observations and to well reproduce ground deformation in all cases. Afterwards, a parametric analysis has been performed modifying the Coulomb friction coeffi- cients at the soil-lining interface to show the relevance of this parameter on the stresses mobil- ized in the lining.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
