Behavior of cantilever secant pile wall supporting excavation in sandy soil considering pile-pile interaction
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ORIGINAL PAPER
Behavior of cantilever secant pile wall supporting excavation in sandy soil considering pile-pile interaction Mohamed I Ramadan 1,2
&
Mohamed Meguid 3
Received: 30 July 2019 / Accepted: 25 May 2020 # Saudi Society for Geosciences 2020
Abstract This study presents the results of a numerical investigation performed to investigate the behavior of a cantilever secant pile wall (CSPW) used to support excavation in sandy soil. These types of excavations have the potential to cause severe ground movement and possible damage to the adjacent structures. A major concern in supporting excavation is to predict and control ground movement associated with excavation particularly in cohesionless soils, as it could trigger global instability and catastrophic failure. The magnitude and distribution of lateral earth pressure and ground movement depend mainly on soil properties, excavation depth, excavation plan geometry, the stiffness of the supporting wall, and the contact between the secant piles themselves. Three-dimensional finite element model has been developed in this study to capture the excavation and wall geometry. A parametric study has been performed using a wide range of sand density, excavation depth, wall flexural stiffness, and bonding between piles within the wall. The results allowed for the development of an approach to predict both the wall deflection for the case of fully and partially bonded piles. This will help engineers to predict ground movement and select an appropriate supporting system that can maintain the stability of the adjacent structures. Keywords Numerical modeling . Cantilever wall . Excavation support . Secant piles . Pile-pile interface
Introduction Ground movement induced by excavation is a challenging problem in geotechnical engineering. Deep excavation in granular material can cause severe ground movement and subsequent damage to the adjacent structures. Most of the previous studies have focused on examining ground movement induced by deep excavation in clay, with emphasis on soft clay material (e.g., Ou et al. 1993; Wong et al. 2002; Responsible Editor: Zeynal Abiddin Erguler * Mohamed I Ramadan [email protected]; [email protected] Mohamed Meguid [email protected] 1
Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia
2
Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
3
Civil Engineering and Applied Mechanics, McGill University, Montreal, Canada
Ge 2002; Hu et al. 2003; Liu et al. 2005; Finno et al. 2006; Kung et al. 2007; Liu et al. 2011; Tan and Wei 2011; Ng et al. 2012; and Liu et al. 2018). However, studies related to excavation in sandy soil are limited to few case histories (Hsiung 2009; Khoiri and Ou 2013; Nikolinakou et al. 2011; Li and Lehane 2010; Zahmatkesh and Choobbasti 2015; Hsiung et al. 2016; Sert et al. 2016; Ji et al. 2019). Several case histories have been analyzed by Moormann (2004), and the results showed that for non-cohesive soil the average value of the normalized hori
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