An estimate of uncertainty in current laboratory pulse test practice

 

A series of pulse tests were performed in an unconfined sample of renwulded Gault clay. Three aspects were investigated: the influence of the arrival time selection method, the influence of source to receiver conliguration – azimuth and distance – and the influence of input signal characteristics-type and apparent frequency. The very high variation registered in axial measurements was a surprise. The main variance factor relates to differences between methods – up to 100% moduli

 

A series of pulse tests were performed in an unconfined sample of renwulded Gault clay. Three aspects were investigated: the influence of the arrival time selection method, the influence of source to receiver conliguration – azimuth and distance – and the influence of input signal characteristics-type and apparent frequency. The very high variation registered in axial measurements was a surprise. The main variance factor relates to differences between methods – up to 100% moduli

uncertainty – but even for a fixed method there is substantial uncertainty – between 20% and 40% in moduli. Both distance and signal characteristics seem to affect the recorded velocity. The usual bulk plane wave model that underlies pulse test interpretation is unable to explain any of these facts.


  A series …


AUTORI: Arroyo M., Greening P.D., Muir Wood D.
RIG ANNO:2002 NUMERO:1
Numero di pagine: 38


Allegato: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2003_1_38.pdf
Allegato:
Articolo completo: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2003_1_38.pdf