SOILS & ROCKS

Laboratory Testing

Laboratory determination of physical and mechanical properties of soils and rocks to support engineering-geological interpretation and design parameters.

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Laboratory testing is a key stage of engineering geological investigations. Its purpose is to determine the actual physical, strength and deformation properties of soils and rocks that form the basis for engineering design decisions. Reliable results depend on proper sampling and preservation, appropriate test methods and the quality of testing. A formal test report has little engineering value if the reported parameters do not reflect actual ground properties.

LABORATORY PROGRAMME

Testing selected for the actual ground conditions

The laboratory programme is defined according to the material encountered, sample quality and the requirements of the project.

Soil Identification

Correct soil identification links every laboratory sample to its actual geological layer, depth and field conditions.

Reliable laboratory testing begins with correct soil identification in the field. Each sample must be accurately related to its geological layer, sampling depth and observed ground conditions. Errors at this stage can lead to test results being assigned to the wrong engineering geological unit, reducing the value of even technically correct laboratory measurements.

Physical Properties

Physical properties define the natural state and classification of the soil and form the basis for further engineering evaluation.

Representative sampling, proper sealing, preservation and transportation are essential for maintaining the natural condition of the soil. Laboratory determination of moisture content, density, grain-size distribution, plasticity and related properties provides the basic parameters required for soil classification and interpretation of its engineering behaviour.

Strength Characteristics

Strength testing determines the soil parameters that govern its resistance to shear and failure under loading.

Strength characteristics must represent the actual soil condition and the expected stress state of the ground. Direct shear, triaxial and other appropriate tests are selected according to the soil type and project requirements to determine parameters such as cohesion, friction angle and shear strength for engineering calculations.

Deformation Characteristics

Deformation testing evaluates how the ground compresses and settles under the loads transmitted by the structure.

The performance of a foundation depends not only on soil strength but also on its deformation behaviour. Compression and consolidation testing is used to evaluate compressibility, settlement response and deformation parameters under relevant loading conditions, providing essential data for the assessment of foundation settlements and serviceability.

Rock Testing

Rock testing provides quantitative data on the strength and physical properties of intact rock material.

Laboratory testing of rock samples complements field observations of core condition, fracturing and rock mass quality. Properly prepared representative specimens are tested for relevant physical and strength properties, including density and compressive strength, providing parameters required for the engineering assessment of rock foundations and excavations.

Quality Review

Laboratory results gain engineering value only after they are checked against field observations and the geological model of the site.

Laboratory results are reviewed for consistency with borehole logs, sampling depths, field descriptions and the overall geological structure of the site. Unusual or contradictory values require engineering review rather than automatic acceptance. This integrated assessment helps ensure that the parameters used in the final report are representative, internally consistent and suitable for design.

FROM SAMPLE TO REPORT

Laboratory results interpreted in geological context

A clear workflow connects the tested sample with its geological origin, laboratory results, engineering parameters and final reporting.

Sample Identification

Each laboratory result must remain directly linked to the sample location, sampling depth and corresponding geological layer. Correct identification ensures that measured properties are assigned to the actual engineering-geological unit they represent.

Result Tables

Laboratory measurements are systematically reviewed and organized into clear result tables and graphical relationships. Individual values are checked for consistency, allowing the overall behaviour of each soil or rock unit to be evaluated rather than relying on isolated test results.

Engineering Parameters

Laboratory results are interpreted together with field observations and geological conditions to establish representative engineering parameters. These values form the basis for assessing strength, deformation and other ground characteristics required for design calculations.

Report Integration

The interpreted laboratory data are incorporated into the geological model, engineering-geological sections, property tables and final conclusions of the investigation. This ensures that laboratory information becomes an integral part of the complete ground assessment provided to the designer.

Laboratory results are not treated as isolated numbers. They are checked against sampling depth, field descriptions, borehole logs and the geological structure of the site, then converted into representative engineering parameters and integrated into the final engineering geological report.