A numerical and experimental study of bearing stiffness of drilled shafts socketed in heterogeneous rock

Chung, Jin; Ko, Jeongsoo; Klammler, Harald; McVay, Michael; Lai, Peter

doi:10.1016/j.compstruc.2011.09.004

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Finite Element Method (FEM) is widely used in predicting the behavior of axially loaded piles (Chung et al, 2012) [6]. In this study, the results from an axisymmetric two-dimensional analysis of piles bearing in dense to very dense sand are presented.…”

Section: Numerical Modelmentioning

confidence: 99%

Modeling of Large Diameter Piles in Soil Formations Including Soft Clay

Aboshita

Salem

Abdelatty

2020

Port-Said Engineering Research Journal

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In Egypt, large diameter piles are used in some sites with diameters exceeding 2 m. In some cases, these piles carry foundations of heavy structures and/or large vertical and lateral loads. The analysis and design methodologies of large diameter piles are mainly controlled by the relatively smaller diameter piles, usually ranging between 60 and 120 cm. However, there is a special need for the analysis and design of larger diameter piles (i.e., larger than 120 cm) to assess their actual load carrying capacities. This paper presents numerical modeling of end bearing piles constructed in thick layer of soft to very soft clay underlain by a dense sand layer, typical to large zones in Northern and North Eastern zones in Egypt. The finite element analysis software ADINA (2018) [2] is used to simulate the behavior of the large diameter bored piles. Results showed that increasing the pile diameter cause a corresponding increase in pile capacity. It is also noticed that increasing pile embedded length in the end bearing sand layer has an enormous effect on pile capacity especially for larger diameter piles. .

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Section: Numerical Modelmentioning

confidence: 99%

Modeling of Large Diameter Piles in Soil Formations Including Soft Clay

Aboshita

Salem

Abdelatty

2020

Port-Said Engineering Research Journal

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“…To analyze load transfer of pile under vertical loads, a series of method have been proposed. Laboratory test [3][4][5][6][7] could evaluate the vertical behaviors of pile; however, there are differences between small scale model pile test and engineering practice. Numerical method [1,2,8,9] could simulate various engineering conditions, but parameters of sophisticated soil constitutive relations are hard to obtain.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Vertical Response of Drilled Pile at the Crest of Rock Slope Based on Shear Behavior

2021

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This paper proposed a method for analysis of a drilled pile under vertical load at the crest of rock slope. Based on wedge theory, a modified model of normal stiffness of socket wall affected by the slope is obtained. Analyze the shear behaviors of the pile-rock interface, an analytical solution of load transfer of pile at the crest of rock slope is obtained. To evaluate the accuracy of the new method, this method is compared with the results of finite difference analysis. Finally, the method is used to analyze the effect of slope, pile, and rock properties on the unit side resistance and axial force.

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“…Although large shaft capacities can be generated through end bearing, due to several factors it is common practice in Florida to design drilled shafts solely using skin friction. These factors include: a possible lack of rock layer uniformity beneath each shaft, the possibility of inadequate clean-out at the base of the shaft during excavation leading to a "soft toe" condition, and most importantly the unacceptably large amount of shaft displacement required to fully mobilize end bearing based on LRFD service limits (AASHTO 2009;Brown et al 2010;Chung et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Assessment of shear strength from measuring while drilling shafts in Florida limestone

et al. 2019

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The focus of this research is the real-time assessment of drilled shaft capacity based on the unconfined compressive strength (qu) obtained from measuring while drilling (MWD). Measures of qu, a function of rock strength commonly used in drilled shaft design, are provided through five monitored drilling parameters: torque, crowd, rotational speed, penetration rate, and bit diameter. Monitored shaft installations took place at three separate locations on drilled shafts, which were subsequently load tested. Using the qu values obtained from MWD, side shear was estimated in portions of each shaft where instrumented segments indicated the side shear was fully mobilized for direct comparison. To consider all of the current side shear equations used in Florida drilled shaft design, the estimation of tensile strength (qt) in real time was also needed. This led to a theoretical approach to establish the qt/qu relationship that was later verified empirically and provided new correlations between material and mechanical properties of Florida geomaterials. A comparative analysis indicated that the results from multiple established side shear equations, used with qu from MWD, align well with the results obtained from load testing. This suggests that estimating drilled shaft capacity from MWD is viable to reduce spatial uncertainty.

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A numerical and experimental study of bearing stiffness of drilled shafts socketed in heterogeneous rock

Cited by 9 publications

References 14 publications

Modeling of Large Diameter Piles in Soil Formations Including Soft Clay

Modeling of Large Diameter Piles in Soil Formations Including Soft Clay

Analysis of Vertical Response of Drilled Pile at the Crest of Rock Slope Based on Shear Behavior

Assessment of shear strength from measuring while drilling shafts in Florida limestone

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