A new hyperbolic variation method for settlement analysis of axially loaded single friction piles
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ORIGINAL PAPER
A new hyperbolic variation method for settlement analysis of axially loaded single friction piles Mustafa Mert 1
&
Mustafa Tugrul Ozkan 2
Received: 14 February 2020 / Accepted: 29 July 2020 / Published online: 12 August 2020 # Saudi Society for Geosciences 2020
Abstract This study describes a new hyperbolic method based on load transfer method for settlement analysis of axially loaded single friction piles. The new method is obtained by examining 14 pile load tests. The examined test piles were loaded until the piles were failed, and they were chosen from friction piles having variable diameters from 0.6 to 2.0 m and located in different geographical regions. Twelve of these test piles were circular bored piles, and two of them were barrette piles. According to the proposed hyperbolic method, the load–settlement graph is divided into two parts, and the relationship between load and settlement is defined by using two different hyperbolic variations each corresponding to one of the parts. Results of the settlement analysis of the four test piles obtained from the new proposed method and the four from the different methods based on load transfer method are presented comparatively with each other and with the pile load test results. The results of the pile settlement analysis and those of the pile load tests demonstrate that the new hyperbolic method yields accurate results for the most bored friction piles. The load settlement plots obtained by the new method match appropriately with measured values. On the other hand, the results of the barrette piles obtained from the hyperbolic method do not show the proper fit like those of the bored piles, when they are compared to those of the other methods based on the load transfer method. Keywords Pile . Settlement . Failure . Load transfer method . Instrumentation and monitoring
Introduction Very often, only bearing capacity calculations are done for the design of piled foundations. However, pile settlement calculations are of prime importance and are considered as a part of pile design. In practice, there are pile applications damaged due to large settlement, where the piles have sufficient capacity. Besides the capacity analysis, settlement analysis must be a part of every design of a piled foundation (Fellenius 2004). There are several methods for settlement analysis of single piles developed by many researchers. In literature, these Responsible Editor: Zeynal Abiddin Erguler * Mustafa Mert [email protected] Mustafa Tugrul Ozkan [email protected] 1
Civil Engineering, Fatih Sultan Mehmet Vakif University, Sutluce Mah, Karaagac Cad. No: 12 Beyoglu, Istanbul, Turkey
2
Istanbul Technical University, Istanbul, Turkey
methods are examined in four main categories which are the load transfer method (Seed and Reese 1957), the shear displacement method (Randolph and Wroth 1979), the elastic theory method (Xu and Poulos 2000), and the numerical analysis method including finite element method (Comodromos et al. 2009; Said et al. 2009). Load transfer mechanism
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