Numerical Modeling of Unfavorable CFA Pile Drilling Conditions
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ORIGINAL PAPER
Numerical Modeling of Unfavorable CFA Pile Drilling Conditions Mohamed G. Arab Adel Dif
. Mahmoud Abdelmoghni . Sherif A. Y. Akl .
Received: 25 November 2019 / Accepted: 14 July 2020 Springer Nature Switzerland AG 2020
Abstract Drilling and installation of deep foundations typically alter and affect surrounding soils and subsequently affect the adjacent structures. Possible effects on the adjacent structures due to the installation of driven piles have been thoroughly investigated in the literature. However, little attention has been given to other pile installation techniques such as continuous flight auger (CFA). In this paper, unfavorable CFA drilling conditions are discussed and investigated using three-dimensional (3D) finite element analyses. The induced settlements around the piles are calculated to assess the possible adverse effects on surrounding structures. The numerical models are
M. G. Arab (&) Civil & Environmental Engineering Department, College of Engineering, University of Sharjah, 27272 Sharjah, UAE e-mail: [email protected]; [email protected] M. G. Arab A. Dif Structural Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt M. Abdelmoghni Civil Engineering Department, Misr Higher Institute for Engineering & Technology, Mansoura, Egypt e-mail: [email protected] S. A. Y. Akl Soil Mechanics & Foundations Research Laboratory, Cairo University, Giza 12613, Egypt e-mail: [email protected]
validated using laboratory physical modeling of unfavorable soil drilling conditions reported in the literature. The analyses showed that unfavorable drilling conditions might have a major effect on adjacent structures up to two times the pile length. Parametric numerical modeling has also been conducted to study the influence of different parameters such as soil shear strength parameters, pile length, pile diameter, and soil permeability on the deformation adjacent to CFA pile during construction. The results revealed that soil relative density and permeability have a significant influence on the calculated surface settlement. Finally, several pile group drilling scenarios were investigated to gain insight into the optimum scenario for pile drilling. The analyses show that alternating between drilling piles near the structure and those far from it, may significantly reduce the surface settlement during pile construction. Keywords CFA Unfavorable drilling Overflighting Surface settlement Bored piles Pile installation
1 Introduction The development of continuous flight auger (CFA) piles, (also known as augured cast-in-place (ACIP) especially in the United States) started more than 40 years ago on hydraulic drilling rigs in the 1970s
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(Legrand 2001). CFA piling is a preferable technique especially in residential and commercial multi-story buildings in inner urban areas because of its minimal vibration during installation (Arab et al. 2018). In favorable soil drill
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