ÖNORM EN ISO 22476-2

This document specifies requirements for indirect investigations of soil by dynamic probing as part of geotechnical investigation and testing according to EN 1997-1 and EN 1997-2. This document covers the determination of the resistance of soils and soft rocks in situ to the dynamic penetration of a cone. A hammer of a given mass and given height of fall is used to drive the cone. The penetration resistance is defined as the number of blows required to drive the cone over a defined distance. A continuous record is provided with respect to depth but no samples are recovered. Four procedures are included, covering a wide range of specific work per blow: dynamic probing light (DPL): test representing the lower end of the mass range of dynamic equipment; dynamic probing medium (DPM): test representing the medium mass range of dynamic equipment; dynamic probing heavy (DPH): test representing the medium to very heavy mass range of dynamic equipment; dynamic probing super heavy (DPSH): test representing the upper end of the mass range of dynamic equipment. The test results of this document are specially suited for the qualitative determination of a soil profile together with direct investigations (e.g. sampling according to prEN ISO 22475-1) or as a relative comparison of other in situ tests. They may also be used for the determination of the strength and deformation properties of soils, generally of the cohesionless type but also possibly in fine-grained soils, through appropriate correlations. The results can also be used to determine the depth to very dense ground layers e.g. to determine the length of end bearing piles, and to detect very loose, voided, back-filled or infilled ground.