Not using a guide rod Incorrect N-value obtained. The Standard Penetration Test recovers a highly disturbed sample, which is generally not suitable for tests which measure properties of the in-situ soil structure, such as density, strength, and consolidation characteristics. NEWSLETTER Subscribe to our free monthly newsletter. Standard Penetration Test blow counts do not represent a simple physical property of the soil, and thus must be correlated to soil properties of interest, such as strength or density. December 28, at 4: As products become increasingly complex, product lifecycle management PLM is steadily growing, with new solutions and companies entering the space.
Standard penetration test
The test procedure is described in ISO , ASTM D  and Australian Standards AS Clay Silt Sand Gravel Peat Loam Loess. This is driven into the ground at the bottom of a borehole by blows from a slide hammer with a mass of Environmental and Engineering Geoscience, Vol. Soils in arid areas, such as the Western United States , may exhibit natural cementation. It is a simple and inexpensive test to estimate the relative density of soils and approximate shear strength parameters. D Practice for Classification of Soils for Engineering Purposes Unified Soil Classification System.
SPT (Standard Penetration Test)
Correlation between SPT-N value, friction angle, and relative density