Schelpfactoren bij door grond horizontaal belaste palen

Schelpfactoren bij door grond horizontaal belaste palen

Den Arend, D.E.

Van Tol, A.F. (mentor)
Everts, H.J. (mentor)
Bakker, K.J. (mentor)
Joosse, J.F. (mentor)
Hoefsloot, F.J.M. (mentor)

Civil Engineering and Geosciences

Hydraulic Engineering

2010-12-10

Piles subjected to horizontal soil displacements are a common phenomenon at constructions next to soil embankments, for example an abutment of a bridge. Shell factors play an important role in the analysis of these piles with 2-dimensional (2D) design methods. This study investigates if the limitations of a 2D method, in relation to the 3-dimensional reality, can be covered by shell factors. Starting points for this study were the conclusions from the recently published CUR-report 228: Ontwerprichtlijn door grond horizontaal belaste palen. First, by a literature study and an analysis of current 2D-methods, the role of shell factors in these methods is investigated. It appears that shell factors are being used in different ways, to take care of different 2D limitations, depending on the method. In current design practice, this difference in function of the shell factor is often not taken care of. Second, a PLAXIS 2D finite element model is made to calculate shell factors. With this model a parameterstudy is been executed, in which the influence of the following parameters on the value of the shell factor is been determined: • Horizontal soil stress; • Soil parameters: soil stiffness, cohesion and angle of internal friction; • Pile diameter and pile shape; • Size of the relative pile-soil displacement. A single pile is being considered, and time-dependant factors (consolidation and creep) are being neglected. Finally, a calculation is made with a 2D method, with calculated shell factors. The results are validated on the measurements of a laboratory test. From the study, it can be concluded that it is possible to make good predictions of bending moments in piles, with the use of correct shell factors. Because the study is executed with a 2D model, validation with a 3D finite element method is necessary. Further investigation of the time-dependant aspects, such as creep, is highly recommended.

Shell factor
pile
foundation
soil displacement

http://resolver.tudelft.nl/uuid:90a59158-6c35-49b0-bfdf-3bcffb11bb91

2010-12-15

Student theses

master thesis

(c) 2010 Den Arend, D.E.