Publication Abstract

Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)

Friction piles in sand - prediction of bearing capacity and load/displacement curve
L. Jendeby, K. Rankka & C. Noren

During 1990, a number of office buildings were constructed at the eastern shore of Lake Munksjon in Jonkoping, Sweden. The subsoil consisted of fine sand down to approximately 100 m of depth. The buildings were founded on prefabricated concrete piles, (235 or 270 mm), of about 20 m length, offering allowable loads of 450-900 kN. Within the area, static as well as dynamic load tests were carried out. The difference between the capacity interpreted from static and dynamic load test was less than 20 % for the three quite similar piles tested. The capacity determined from static load tests varied from 1400 to 1720 kN. Based on the results from geotechnical investigations, the capacity was predicted by means of seven different methods, while the load-settlement curve was predicted by means of six different methods. The results show that the prediction of the capacity is very much dependent on the method used. The ration between the predicted and the measured capacity varies between 0.4 and 1.9. The load-settlement curve for service loads (<50% of the capacity) can, however, be fairly well predicted, but the discrepancies for higher loads are considerable.

 article #804; publication #36 (IC-1994)