Various information on SDMT testing procedure, including SDMT, is contained in the general document on SDMT.

Additional information can be found in SDMT Specifications(en/ita).

 

Note

In order to execute a seismic test (by SDMT), the membrane has to be closed, for completeness of the electrical circuit. Therefore, if the soil pressure is insufficient to close the membrane, the operator should apply a depression during the SDMT execution.

 

References

Butcher A.P., Campanella R.G., Kaynia A.M., Massarsch K.R. (2005). “Seismic cone downhole procedure to measure shear wave velocity – a guideline“.

ASTM 2008 “Standard Test Methods for Downhole Seismic Testing“.

Protezione Civile (2008) “Indirizzi e criteri per la microzonazione sismicaUniversità di L’Aquila, Dipartimento DISAT, Prova SDMT pp. 397-405.

 

 

SEISMIC SOURCE ONLAND AND OFFSHORE

Correct hitting direction: should be (at least approximately) perpendicular to the line from the rods to the center of the source.

 

 

SEISMIC SOURCE ONLAND

 

 

SEISMIC SOURCE OFFSHORE

 

SDMT seismic measurements are possible also in offshore sites. A modified version of the shear wave source is lowered to the seafloor and is actioned from the operator at surface. Measurements of Vs have been performed with a maximum water level of 50 m and at a maximum depth of 40 m below the seafloor.

 

SDMT_Offshore_Genova
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