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September 05, 2019

Constructing Load Transfer: Q-z and T-z Curves From Pile Loading Test

Omar El-Kadi 

Teacher assistant, The American University in Cairo, Cairo, Egypt

A.S.K. Elkadi

TNO DIANA BV, Delft, the Netherlands




Pile systems analysis is a common problem for geotechnical engineers, which have seen a huge development in the methods and techniques of analysis, starting with empirical formulas based on laboratory test results in a form of load transfer curves for both pile shaft and base resistance, to theoretical equations for load resistance of both pile shaft and base, A.El RAMLI & F.EL KADI 1974 (1), moreover numerical analysis techniques have been widely implemented specially with the high development in computing capabilities and commercial software. The numerical analysis techniques allowed the study of pile group effect not only in terms of spacing and numbers, but also considering the effect of piles distribution geometry, non uniform pile length, structure soil interaction and ability to simulate the heterogeneous soil within the pile group or piled raft. in spite of the capabilities of numerical analysis technique, obstructions such as time and computer memory were against the non linear analysis, which lead the software developers to introduced embedded pile for modeling the pile as a line elements instead of solid elements with line to solid interface in order to reduce degrees of freedom in the model and deduct the time of modeling as the nodal connectivity between the pile beam element and the surrounding soil elements is not required, however pile loading test is still a mandatory step in most of reference standards and regulations. accordingly in this research a pile load test results were implemented in a form of load transfer curves using embedded pile elements presented by TNO DIANA - MIDAS GTS 1997 to get the advantage of simulating the non linear pile behavior and reduce the needed time and computing demands. this technique allowed a good simulation of pile behavior with the ability of modeling large number of piles and the effect of super structure on the foundation"


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