Comparison between measured displacements and numerical analysis in a 39 meter deep excavation in Tehran

Seyed Nima Mirhadi, Ali Yazdansepas, Roozbeh Salehabadi

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Field Cases II

ABSTRACT: The new Atiyeh Hospital project in Tehran, Iran consists of a 25-story building includes 7 levels of underground parking and 2 levels of underground building facilities, requiring a 39m deep excavation immediately adjacent to city streets and residential properties. Soil nail wall system combined with ground anchors and concrete piles are designed to retain the excavation. Excavating has been done about 20m below groundwater level. In the presented paper the predicted displacements calculated by numerical analysis are compared to real deformations. Finite element models were used to assess the deformations of the excavation. Hardening soil model is implemented to investigate the soil deformations. Instrumentation results show good but not perfect agreements with the predicted displacements. Conclusions show that soil strength parameters and numerical modelling assumptions have major effects on predicted results.

RÉSUMÉ: mètres de profondeur à Téhéran sont comparés aux résultats prévus par la méthode d'analyse des éléments finis. Pour bonne concorpeut être fonction des raisons différentes qui seront étudiées dans cet article. Les premiers résultats montrent que les paramètres de résistance, les hypothèses de la mde jouer le rôle majeur sur ledit écart.

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