TY - JOUR
T1 - Behavior of a large diameter bored pile in drained and undrained conditions
T2 - Comparative analysis
AU - Al‐atroush, Mohamed Ezzat
AU - Hefny, Ashraf
AU - Zaghloul, Yasser
AU - Sorour, Tamer
N1 - Funding Information:
Acknowledgments: The research is partially supported by the Structures and Materials (S&M) Research Lab of Prince Sultan University, Saudi Arabia. Besides, the authors would like to express their sincere gratitude to F.A.‐ K., for his vigorous efforts, constructive suggestions, and continuous encouragement to perform this research.
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020
Y1 - 2020
N2 - Despite the difficulties in obtaining the ultimate capacity of the large diameter bored piles (LDBP) using the in situ loading test, this method is the most recommended by several codes and design standards. However, several settlement‐based approaches, alongside the conventional capacity‐based design approach for LDBP, are proposed in the event of the impossibility of performing a pile‐loading test during the design phase. With that in mind, natural clays usually involve some degree of over consolidation; there is considerable debate among the various approaches on how to represent the behavior of the overconsolidated (OC)stiff clay and its design parameters, whether drained or undrained, in the pile‐load test problems. In this paper, field measurements of axial loaded to failure LDBP load test installed in OC stiff clay (Alzey Bridge Case Study, Germany) have been used to assess the quality of two numerical models established to simulate the pile behavior in both drained and undrained conditions. After calibration, the load transfer mechanism of the LDBP in both drained and undrained conditions has been explored. Results of the numerical analyses showed the main differences between the soil pile interaction in both drained and undrained conditions. Also, field measurements have been used to assess the ultimate pile capacity estimated using different methods.
AB - Despite the difficulties in obtaining the ultimate capacity of the large diameter bored piles (LDBP) using the in situ loading test, this method is the most recommended by several codes and design standards. However, several settlement‐based approaches, alongside the conventional capacity‐based design approach for LDBP, are proposed in the event of the impossibility of performing a pile‐loading test during the design phase. With that in mind, natural clays usually involve some degree of over consolidation; there is considerable debate among the various approaches on how to represent the behavior of the overconsolidated (OC)stiff clay and its design parameters, whether drained or undrained, in the pile‐load test problems. In this paper, field measurements of axial loaded to failure LDBP load test installed in OC stiff clay (Alzey Bridge Case Study, Germany) have been used to assess the quality of two numerical models established to simulate the pile behavior in both drained and undrained conditions. After calibration, the load transfer mechanism of the LDBP in both drained and undrained conditions has been explored. Results of the numerical analyses showed the main differences between the soil pile interaction in both drained and undrained conditions. Also, field measurements have been used to assess the ultimate pile capacity estimated using different methods.
KW - Drained and undrained conditions
KW - Failure mechanism
KW - Finite element method
KW - Large diameter bored pile
KW - Load transfer
KW - Overconsolidated stiff clay
KW - Two dimensional axisymmetric
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U2 - 10.3390/geosciences10070261
DO - 10.3390/geosciences10070261
M3 - Article
AN - SCOPUS:85090717678
SN - 2076-3263
VL - 10
SP - 1
EP - 19
JO - Geosciences (Switzerland)
JF - Geosciences (Switzerland)
IS - 7
M1 - 261
ER -