Obtaining a representative and undisturbed sample of cohesive sedimentary soil, such as sand, is very difficult and oftentimes impossible. Because of this, determining the properties of sandy or fine-grained soils is best done in-situ, making Cone Penetration Testing (CPT) one of the best testing methods for measuring mechanical properties of the sediment.
Sediment Cone Testing
When conducting cone testing of sediment the horizontal stress and sediment density are the most influential parameters on the cone tip resistance. The cone penetration tip resistance is influenced by the soil properties ahead of and below the tip. If you’re dealing with a sand layer that is less than 70 cm., it’s important to consider what types of stratification it is located between. For example, if it’s located between deposits of soft clay the CPT may not reach it’s full value within the sand layer, meaning the relative density of the sand may be underestimated. By monitoring the CPT pore pressures, these influencers can be identified.[Read more…]