A series of pulse tests were performed in an unconfined sample of remoulded ault clay. Three aspects were investigated: the influence of the arrival time selection method, the influence of source to receiver configuration - 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.
|Number of pages||19|
|Journal||Rivista Italiana di Geotecnica|
|Publication status||Published - 2003|