STUBORE® provides the technical conditions necessary for high-quality sampling—from controlled core extraction in loose rock to layer-specific sampling in varying geological formations.

The quality of a drill core sample is non-negotiable. It determines which soil properties can be reliably determined at all: moisture content, grain size distribution, consistency limits, unit weight, or—in the highest category—strength and deformation behavior. Any disturbance caused by the sampling method cannot be corrected in the laboratory.

The following applies to the classification of sampling methods: The lower the degree of disturbance caused by the method—due to resetting, leaching of fine particles, thermal effects, or pressure relief—the higher the quality class achievable for the obtained sample.

STUBORE® minimizes these disturbances through its design:

• The continuous tubing prevents material from falling back and settling between horizons.
• The double-core tube protects the core from direct contact with the flushing fluid during drilling.
• The stationary core does not rotate—eliminating mechanical disturbance caused by torsion.
• The targeted, minimized use of air flushing reduces the washout of fine particles and thermal stress on the sample—particularly relevant when taking samples from layers containing volatile contaminants such as CHCs or PFAS.
• Liner drilling (triple casing) enables the collection of particularly sensitive samples with minimal disturbance to the soil structure.

Each drilling section is precisely recorded by depth, and the extracted core is clearly assigned to its source layer. Standardized procedures from drilling to core box ensure reproducibility and comparability—across sites and teams.