The paper describes a fast design method for horizontal drains to be used as a mitigation technique for liquefaction, developed in the framework of the European project LIQUEFACT. During the earthquake, this ground improvement technique allows to reduce the pore pressure build up under existing buildings, where more conventional vertical drains cannot be used (being it difficult to install them). By reducing the pore pressure increments, the horizontal drains can reduce the liquefaction risk for shallow foundations. The problem is modelled with a bidimensional geometry, applying the consolidation equation in the hypoth- esis of Terzaghi-Rendulic and solving it with a finite difference method. The solution is calcu- lated for different geometrical layouts and removing the simplified hypothesis (used to design vertical drains) of an indefinite symmetry; moreover, it takes into account the influence of a vertical water flow when drainage is allowed at the ground level. The pore pressure build-up is introduced in a simplified manner with an accumulation term suggested in literature. A para- metric analysis has been performed and is reported in the paper to obtain design charts. They may be used to define the spacing between drains once the geometric layout, the ground con- ditions and the seismic input are defined.

DESIGN METHOD FOR HORIZONTAL DRAINS IN LIQUEFIABLE SOIL / DE SARNO, D.; Fasano, G.; Bilotta, E.; Flora, A.. - (2019). (Intervento presentato al convegno Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, (ICEGE 2019), June 17-20, 2019, Rome, Italy tenutosi a Roma (Italy) nel 17-21 June 2019) [10.5281/zenodo.3463426].

DESIGN METHOD FOR HORIZONTAL DRAINS IN LIQUEFIABLE SOIL.

DE SARNO D.;FASANO G.;BILOTTA E.;FLORA A.
2019

Abstract

The paper describes a fast design method for horizontal drains to be used as a mitigation technique for liquefaction, developed in the framework of the European project LIQUEFACT. During the earthquake, this ground improvement technique allows to reduce the pore pressure build up under existing buildings, where more conventional vertical drains cannot be used (being it difficult to install them). By reducing the pore pressure increments, the horizontal drains can reduce the liquefaction risk for shallow foundations. The problem is modelled with a bidimensional geometry, applying the consolidation equation in the hypoth- esis of Terzaghi-Rendulic and solving it with a finite difference method. The solution is calcu- lated for different geometrical layouts and removing the simplified hypothesis (used to design vertical drains) of an indefinite symmetry; moreover, it takes into account the influence of a vertical water flow when drainage is allowed at the ground level. The pore pressure build-up is introduced in a simplified manner with an accumulation term suggested in literature. A para- metric analysis has been performed and is reported in the paper to obtain design charts. They may be used to define the spacing between drains once the geometric layout, the ground con- ditions and the seismic input are defined.
2019
DESIGN METHOD FOR HORIZONTAL DRAINS IN LIQUEFIABLE SOIL / DE SARNO, D.; Fasano, G.; Bilotta, E.; Flora, A.. - (2019). (Intervento presentato al convegno Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, (ICEGE 2019), June 17-20, 2019, Rome, Italy tenutosi a Roma (Italy) nel 17-21 June 2019) [10.5281/zenodo.3463426].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/776780
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