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Bridges, quay walls, dikes, tunnels, they must be sustainable, economical and safe. This requires an appropriate investigation of the subsoil. The Geotechnics Division (GEO) has the task of investigating the nature and characteristics of the soil and to predict its behaviour. Geotechnical tests and measurements are carried out in the field and in the laboratory to investigate nature, stratification and characteristics of the soil. Our division invests in innovative technologies such as advanced testing and online monitoring.

Geotechnics corporate video

"She is so ingenious, the earth. Capable of mobilizing her particles to masses, to operas and symphonies of mud and subsidences and slides, … "

- From “While the gods were sleeping” by Erwin Mortier


GEO is one of the 3 partners of the Database of the subsoil of Flanders (DOV). This project valorizes the geotechnical, geological, geothermal, hydrological and pedological data in Flanders. The data collected on the soil in Flanders are made available free of charge. DOV opts for an open data policy and operates in accordance with Flemish decrees and international agreements. You can find more info at

Databank Ondergrond Vlaanderen



The construction of the Deurganckdock lock is one of the largest building sites currently being worked on in Belgium. In order to draw up the design, a comprehensive testing program was conducted by the Geotechnics Division. Geotechnical design calculations were also made, with particular attention paid to the swell of the Boom clay. We are also closely involved with the execution of the project. Geotechnical follow up of activities on the site linked with an intensive monitoring program for the estimation of the swell of the Boom Clay, was a challenge.




Bouw van een Nieuwe Sluis in Terneuzen

De bouw van de Nieuwe Sluis in Terneuzen is een uitdagend project dat wordt uitgevoerd binnen
een nauw samenwerkingsverband tussen Nederland en Vlaanderen. In dit artikel wordt
een overzicht gegeven van het grondonderzoek dat in de voorbereidingsfase werd uitgevoerd.
Tevens worden de belangrijkste geotechnische aspecten en risico’s toegelicht, verbonden aan
de specifieke ondergrond in het projectgebied, met name door de aanwezigheid van Boomse
klei en glauconiethoudend zand.

T1 formulier

One-dimensional consolidation of overconsolidated clay using Constant Rate of Strain testing

The main method for the determination of consolidation parameters in Flanders is still the incremental loading test (IL test). This method can take up to several weeks for some typical Flemish overconsolidated (OC) clays. In theory, the same relationship between settlement and vertical stress can be obtained by performing a constant rate of strain test (CRS test).