The seismic dilatometer test sdmt in geotechnical inshore and offshore investigation
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The Seismic Dilatometer test (SDMT) in geotechnical inshore and offshore investigation. Studio Prof Marchetti. www.marchetti-dmt.it. Some examples of maritime construction. Mooring. Trench for pipe. Wind generators. Sheet piles. Oil and gas platform.

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The Seismic Dilatometer test (SDMT) in geotechnical inshore and offshore investigation

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The seismic dilatometer test sdmt in geotechnical inshore and offshore investigation

The Seismic Dilatometer test (SDMT) in geotechnical inshore and offshore investigation

Studio Prof Marchetti

www.marchetti-dmt.it


Some examples of maritime construction

Some examples of maritime construction

Mooring

Trench for pipe

Wind generators

Sheet piles

Oil and gas platform


Common tests in offshore investigation

Common tests in offshore investigation

Close water (harbours and bays)

- inshore tests

Open water (sea)

- offshore tests

Shallow water < 30 m

Deep water > 30 m

  • Short test (5 m)

  • cables

  • - pipes

Short test (5 m)

Deep test (30 m)

- foundations

Deep test (30 m)


Harbour dmt test from pier

La Spezia (Italy)Shipyard Beconcini

Pier

Guidepipe

Seabed

Harbour: DMT test from pier

Steps

  • Make a hole in the deck;

  • Set up the guidepipe;

  • Fix the penetrometer and do the test;


Harbour dmt test from provisional pier

Beam braching

Harbour: DMT test from provisional pier

Salerno harbour (Italy)

Trapezio Deck


Dmt test with floating wheels module

DMT test with Floating Wheels Module

Two ton static penetrometer mounted on a floating raft, with screws for anchoring.

Only for very shallow water: 1-2 m;

Short test: 5 m


Dmt with spt hammer for shallow water costa rica

DMT with SPT hammer for shallow water: Costa Rica


Dmt test with torpedo layout

DMT test with Torpedo - layout

Rig

Jackup

SEA LEVEL

SEABED


Dmt test from jack up

Vado Ligure, ItalyNew embankement area

Venice lagoon, Italy (MO.SE.)

DMT test from Jack-up


Sdmt tests from a floating barge

SDMT tests from a floating barge


Sdmt test from a floating barge layout

SDMT test from a floating barge: layout

Test execution

Barge is free to float.

The upper end of the telescopic pipe is fixed on the pontoon, the lower end is on the seabed. It is a guide for the dilatometer rods.

The operator pushes the rods carefully during floatation.

When the prefixed depth is reached, the operator stops the pushing system, disconnects rods and starts to take the DMT readings.

All the reading are taken when the DMT is fixed, not during penetration.


Sdmt from a floating barge genova italy

SDMT from a floating barge: Genova (Italy)

New Terminal Container – Calata Bettolo (Genova Horbour)


Dmt from a pontoon pushing phase

DMT from a pontoon: pushing phase


Dmt from a pontoon reading phase

DMT from a pontoon: reading phase


Jackup vs floating barge cost comparison

10 days rental ≈ 10.000 €

Jackup vs Floating Barge: cost comparison

10 days rental ≈ 300.000 €

In 10 days you save 290.000 €


Dmt from floatinf barge and jackup barcelona es

DMT from floatinf barge and jackup: Barcelona (ES)

Enlargment Barcelona harbour – collapse of the pier


Dmt test with torpedo in deep water layout

DMT test with torpedo in deep water: layout

Expensive heave compensated ship for offshore test

DMT test for seabed < 100 m of depth;

Test depth: 30-40 m;


Seafloor dmt for shallow water

Seafloor DMT for shallow water

Pontoon

Test depth: 5-7 m


Seafloor dmt in deep water

Seafloor DMT in deep water

Ok usingany vessel with at least 2 ton crane

Test depth: 5-7 m

Limitation:

Max seabed depth: 100m

(due to DMT cable)


What about dmt tests at depth 100 m

What about DMT tests at depth > 100 m ?

No pneumatic cable between vessel and DMT

MEDUSA PROJECT


Medusa project

Medusa Project

Elettronic Board

Pressure Transducer

Pressure Generator

Designed for seabed up to 2000m


Summary and conclusions

Summary and Conclusions

  • Same blade for offshore and onshore sites

  • No calibration necessary for the (high) pore pressure

  • DMT test is independent from the method and speed of penetration (same high quality data using many different penetration methods)

  • Test is rapid and economical if performed with a penetrometer on a floating barge

  • Today SDMT tests are possible up to 100m (using expensive vessels)


In the near future

In the near future..

  • The seafloor DMT will allow to perform shallow tests (5-7 m depth) with a seabed up to 100 m. The test will be very economical because it may be performed using a common vessel with a little crane (2 ton)

  • The Medusa DMT will allow to perform DMT tests up to the depth of 2000 m


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