One should enter the geometrical and geotechnical parameters pertaining to the stratigraphy surveyed trough drilling and the number of blows relative to each test; some corrective parameters can be entered that enable one to limit the perturbations in the interpretation of the data caused by the way the test is performed and the type of instrument that is used.

When interpreting the CPT test results, the program divides, as normal practise, granular terrains with a prevalence of sand from cohesive terrains made up mostly of clay.

For granular terrains, it is able to determine (from the data that has been entered) the friction angle, the drained compressibility and the relative density, while for cohesive terrains it evaluates the shear resistance in undrained conditions, compressibility, sensitivity and the degree of over-consolidation.

For the interpretation of this test the data required are, yet again, extremely simple: the classification of the terrain that has to be used, the measured test values and any correction factors that prove necessary to limit perturbations in the interpretation of the data.

With the DP test interpretation, which is mainly used in granular terrains and to localise resistant strata, the program supplies all the information previously mentioned for the SPT test.

The INSITU program can be adapted to any measurement instrument.

EXAMPLES OF GRAPHIC OUTPUTS

Here are some examples of program-generated graphic outputs:

• SPT - terrain identification method: Skempton;
• SPT - terrain identification method: Schmertmann;
• CPT - terrain identification method: Schmertmann;
• CPT - terrain identification method: Begemann;
• CPT - terrain identification method: Douglas and Olsen;
• CPT - terrain identification method: Olsen and Farr;
• CPT - terrain identification method: Searl;
• DP - terrain identification method: Schmertmann;
• DP - terrain identification method: Skempton