Characteristic parameters

Characteristic parameters with CVsoils

Dynamic Probing software allows to define two stratigraphies: one established by the user based on the number of blows, the other on instrumental step.

The stratigraphy on instrumental step is very useful as the geotechnical parameters are returned in step, which can be exported from the command Export to other GeoStru programs, selecting file xlm for CVsoils. These files can be exported for the new GeoStru program, ‘CVsoils’, for the determination of characteristic geotechnical parameters.

In order to perform processing on instrumental step is necessary:

a)	To define in data entry, in addition to stratigraphy user, even the stratigraphy on instrumental step;

b)	To select Elaboration on instrumental step from the shortcut menu of tests.

Characteristic parameters with Dynamic

From the menm General Data, Nspt calculation, there is the opportunity to choose how to assess Nspt in the layer. In addition there is the opportunity to select several options, among them a particular clarification:

Normal distribution R.C.

The value of Nspt,k is calculated on the basis of a normal or Gaussian distribution, fixed a probability of no exceedance of 5%, according to the following expression:

where σNspt is the standard deviation of Nspt.

Normal distribution R.N.C.

The value of Nspt,k is calculated on the basis of a normal or Gaussian distribution, fixed a probability of no exceedance of 5%, treating mean values of Nspt normally distributed:

where n is the number of samples.

The first distribution gives values near the minimum, whereas the second provides values close to average.