Proceedings of the Fourth International Conference on New Developments in Soil Mechanics and Geotechnical Engineering vol:1 issue:1 pages:225-230
International conference on New Developments in Soil Mechanics and Geotechnical Engineering edition:4 location:Near East University, North Cyprus date:2-4 June 2016
Pile foundations are a frequently used foundation technique in Belgium. Installation coefficients for standard pile types are described in Eurocode 7 and the national annex. These installation coefficients are determined and based on empirical research. Unfortunately not every specific pile type is mentioned in Eurocode 7. This paper starts with a description of the screw pile technique with grout injection and typical specifications of the performed CPT’s and SLT’s. Test results of CPT’s and SLT’s are demonstrated and analyzed. The bearing capacity of two screw piles is calculated based on 2 CPT results according to Eurocode 7 and the national annex. The bearing capacity of the screw piles is measured through 2 SLT’s. Comparing both calculated and measured analyzes, results in a global installation coefficient. Theories of Fellenius and Chin are used to calculate the stress/strain distribution in the piles. As a result, the global installation coefficient can be divided in an installation coefficient for the pile base and the pile shaft according to Eurocode 7 and the national annex. The influence of the grout injection on the shaft resistance is demonstrated. To complete, a critical reflection on the calculated installation coefficients and different methods of analysis is done.