Liquefaction hazard during earthquakes at Nocera Scalo, ItalyPart II: Total and effective stress analyses for liquefaction potential assessment

 

The application, described in PART I [CRESPELLANI et al., 2002], of the CPT- based procedure proposed by Robertson e Warm; [1997] (R & W), and suggested by Youd at al. [2001], showed the opportunity of further analyses to confirm the possibility of liquefaction in the alluvial fillings of`Nocera Scalo during the design earthquake.

 

The application, described in PART I [CRESPELLANI et al., 2002], of the CPT- based procedure proposed by Robertson e Warm; [1997] (R & W), and suggested by Youd at al. [2001], showed the opportunity of further analyses to confirm the possibility of liquefaction in the alluvial fillings of`Nocera Scalo during the design earthquake.

Thus, also in consideration of high site effects registered during the aftershocks of the seismic sequence in 1997, an upper level approach for more accurate liquefaction hazard evaluation, inclusive of seismic response analysis and non linearity effects due to cyclic loading and water pore pressure generation, accumulation and dissipation, was performed.

As the site topography is nearly flat, and the properties ofalluvial lillings are relatively uniform, one-dimensional stress-strain models (1D) were considered appropriate for calculating seismic response in the central zone of the valley where the hamlet is located and where previous analyses showed the highest soil liquefaction risk.

Since the area is too large for an accurate definition of dynamic soil properties with the available budget, two sites, representative of the alluvial Glling conditions in the deposit, were chosen to enhance knowledge of liquefaction hazard.

This paper illustrates the results of the dynamic testing investigations and of total and effective stress-strain numerical analyses carried out. The findings are also compared with those obtained by applying the simplified procedures presented in PART I.


  The appl …


AUTORI: Crespellani T., Madiai C.
RIG ANNO:2001 NUMERO:4
Numero di pagine: 48


Allegato: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2002_4_48.pdf
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Articolo completo: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2002_4_48.pdf