MARCHETTI DILATOMETER ®
The Marchetti Dilatometer (DMT) provides a simple method for the rapid, accurate, and economical insitu determination of important soil parameters. GPE, inc. has distributed and manufactured the DMT in North America for over 20 years since its introduction to the U.S. by Dr. John Schmertmann. Developed in Italy by Dr. Silvano Marchetti, the DMT is now used in over 35 countries and is the topic of over 300 research publications. The ASTM Suggested Method (ASTM Geot. Testing Journal, June, 1986) is currently being revised as a Standard Method.
THE BLADE is constructed of high-strength stainless steel. Normally the blade is advancing by pushing from a cone penetrometer rig, at up to 250 tests per day. It may also be pushed with the hydraulic capability of a drill rig. Penetration by driving with SPT or lighter equipment is possible as well. Testing can also start from the bottom of a borehole. The DMT data are then analyzed by computer using published methods described in the users manual.
THE TEST starts by inserting the dilatometer blade into the ground. Gas pressure supplied through tubing from a control unit at the surface is then used to expand a flexible membrane on the face of the blade. The operator determines the A-pressure required to initiate movement of the membrane and the B-pressure required to move its center 1 mm into the soil. Typically the operator performs this simple test at depth intervals of 20 cm or 1 ft.
THE DMT determines these soil parameters:
THE EQUIPMENTsupplied conforms to Marchettis original drawings and includes recent improvements in durability and functionality. It is simple to operate and understand, rugged to use, and mechanically oriented. It is fully portable (dimensions within those of airline luggage) and does not require an external electrical source. The standard hardware and software package includes the following:
FOR EXPLORATION FIRMS
FOR CONSULTING ENGINEERS