Flat dilatometer test (DMT) equipment of Studio Prof. Marchetti S.r.l. (Italia)
The flat dilatometer (DMT) was first developed in Italy by Prof. Marchetti in the mid 1970's as a tool to investigate soil modulus values for laterally loaded driven piles. Further experimental work was undertaken to determine other practical applications for the test to obtain correlations with geotechnical parameters (Marchetti 1980) and the equipment was further refined. Since 1980, however, the mechanical DMT equipment has remained largely unchanged.
The seismic DMT (sDMT) was first developed in 1988 with a single triaxial geophone located just above the standard mechanical DMT blade. Through the 1990's there were subsequent improvements to the system, but only one geophone was still used. The current sDMT with two geophones was developed in Italy in 2007.