Flat Dilatometer test consists in advancing a blade into the ground with any common field machine. At each test depth, a circular steel membrane located on one side of the blade is expanded horizontally against the soil. The pressure readings are recorded at specific moments during the membrane expansion. The blade is advanced to the next test depth, typically with 0.20 m depth interval.
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The seismic dilatometer is an add-on module that may be combined with the dilatometer or with the CPT for measuring the shear wave velocity Vs (SDMT) and optionally compression wave velocity Vp (SPDMT).” The supplied software is user-friendly and provides shear wave velocity results real time during test execution.
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The Medusa DMT is a probe able to autonomously perform dilatometer tests, which generates and measures the pressure directly at depth. The obtained DMT readings are extremely accurate and repeatable, because the fluid is liquid (incompressible) and the pressure regulation is electronically controlled. New test procedures are possible, such as high resolution dissipation tests and horizontal pressure measurements during continuous penetration.
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The Seafloor DMT is a penetrometer for advancing the DMT, the SDMT and the Medusa DMT with multiple short length strokes (0.10 m or 0.20 m). It is very cost-effective compared to competitive devices because it does not require to advance the probe at a specific speed (2 cm/s for CPT). A first prototype was built and tested, but the system is still at a development stage.
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In-house developed software is required for data acquisition and for managing the results of the tests. Additional software is available for specific geotechnical applications using the output parameters of the test measurements.
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