Repozytorium publikacji - Politechnika Gdańska

One of the most popular types of foundations in layered subsoil with very differentiated soil shear strengths are precast piles. One of the reasons is a fact that we can well control the driving process during the installation of these piles. The principles of the assessment of bearing capacity and settlements of the piles given by Eurocode 7, concentrate on two main methods, i.e. Static Pile Load Tests (SPLT) and Dynamic Driving Analysis (PDA). However, the evaluation of real load-settlement curve for piles being driven in layered subsoil, where non-cohesive and cohesive soils oc-cur alternately, is not so easy and straightforward task. In the paper the results of both SPLT and PDA tests for the objects on the Polish highways are presented. Field investigations carried out in various time from the pile installations (from 7 to 90 days) revealed an increase of bearing capacity with time. The reason of it may be a change of the soil state near the piles due to its driving (displacement piles) as well as a change of microstructure at the contact of soil and pile shaft. The results of load tests were referred to the geotechnical parameters of the subsoil, which was recognized by traditional borings and CPTU tests. The results of tests allow for the assessment of phenomena occurring with time and prediction of bearing capacity of precast piles.

Autorzy

• prof. dr hab. inż. Kazimierz Gwizdała link otwiera się w nowej karcie ,
• dr inż. Paweł Więcławski link otwiera się w nowej karcie