Kairausnäytteet

Kairausnäytteet refer to samples collected during the process of drilling, typically in geological or geotechnical investigations. The term "kairaus" is Finnish for drilling. These samples provide direct physical evidence of the subsurface materials, allowing for detailed analysis and understanding of the ground conditions.

The collection of kairausnäytteet is a crucial step in various engineering projects, including foundation design for buildings and infrastructure, resource exploration such as mining and oil and gas, and environmental assessments. The type of drilling rig and the methods used for sample collection depend on the specific project requirements and the expected nature of the subsurface materials. Common drilling methods that yield kairausnäytteet include rotary drilling, auger drilling, and percussion drilling.

The kairausnäytteet can include soil, rock, or even groundwater. Soil samples are often categorized by their grain size, composition, and consistency, while rock samples are analyzed for their lithology, strength, and structural features. Laboratory testing of these samples is essential to determine their physical and chemical properties. These tests can include classification tests (e.g., grain size distribution, Atterberg limits), strength tests (e.g., unconfined compressive strength, triaxial shear strength), and permeability tests. The data obtained from the analysis of kairausnäytteet forms the basis for site characterization and informs engineering design decisions, risk assessments, and the development of mitigation strategies. The proper collection, preservation, and testing of kairausnäytteet are vital for ensuring the reliability and accuracy of subsurface investigations.