The first part of the paper introduces previous past experience in offshore DMT and SDMT testing. The second part of the manuscript introduces the recently developed Medusa DMT. This device is a self-contained cableless probe that is able to autonomously perform dilatometer tests up to a maximum pressure of 25 MPa. Hydraulic pressurization is achieved with a motorized syringe, enabling volumetric control during membrane expansion. Initially conceived only for offshore testing, the Medusa DMT provides higher quality dilatometer data onshore, with the possibility of additional measurements not feasible with the traditional pneumatic equipment.
Mariano A., Amoroso S., Arroyo M., Monaco P., Gens A. (2018)
“Case Study: SDMT-based numerical analyses of a deep excavation in soft soil”
The paper illustrates how SDMT results were used to estimate the G-gamma decay curves to input in Plaxis, for the project of the excavation of Verge de Montserrat Station (Barcelona, Spain)
The estimation of building settlements on saturated sandy and silty soils are a relevant task for the structure serviceability and stability assurance. On these grounds, a need arises for the performance of in situ tests which disturb less the soil when it is explored to depths up to 30 m or more. Results obtained with the CPTU and DMT devices for an urban renovation project with buildings founded on saturated sands and silts in Concepción city, are presented. These results allow the estimation and comparison of structure settlements obtained from CPTU and DMT.