Experimental Study on the Interaction Mechanism of Cap—Pile Group—Soil

X, Bai; He, Weiling; Jia, Jungang; Han, Yunshan

doi:10.1080/10641190600788254

Cited by 8 publications

(4 citation statements)

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“…The pile installation process, pile spacing and the role played by the cap over the piles, with or without ground contact, are some of the factors whose influence on the pile group response need to be better understood. Research based on full-scale pile group load tests (Garg 1979;Liu et al 1985;Bai et al 2006;Dai et al 2012) is still infrequent because of the inherent difficulties of using a large and expensive load-reaction frame system. Consequently, model pile group tests are increasingly used.…”

Section: Introductionmentioning

confidence: 99%

Load-Settlement Behaviour of Model Pile Groups in Sand Under Vertical Load

Sales

Prezzi

Salgado

et al. 2017

Journal of Civil Engineering and Management

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Model pile load testing is effective to study the load-settlement behaviour of pile foundations given the controlled environment in which the testing is done. This paper reports a testing program in a large calibration chamber involving individual piles and pile groups installed in sand samples of three different densities. Tests on both nondisplacement and driven piles are evaluated to assess the influence of the pile installation process on pile load-settlement response. A method is proposed to predict the load-settlement response of a pile group based on the response of a single pile. The method is shown to produce estimates that are in good agreement with measurements. The influence of pile group configuration, pile spacing, soil density and method of pile installation is discussed.

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Section: Introductionmentioning

confidence: 99%

Load-Settlement Behaviour of Model Pile Groups in Sand Under Vertical Load

Sales

Prezzi

Salgado

et al. 2017

Journal of Civil Engineering and Management

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show abstract

“…Zhao [38] found that the bearing capacity of the flexible batter pile groups is higher than that of the vertical pile groups and proposed a calculation method for the bearing ratios of the batter pile groups through model experiments. Bai [1] studied the behavior of interaction between pile cap, pile group, and soil in pile group and explored the influence of soil reaction force on the pile shaft force and pile base resistance and the load transfer mechanism through static load tests.…”

Section: Introductionmentioning

confidence: 99%

Vertical Bearing Behavior and Pile Group Effect for Cemented-Soil Composite Pile Groups Based on On-Site Experiments

Gong,

Dai,

Chen

et al. 2024

Preprint

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Bearing characteristics and interactions of a pile group are complex. and there is almost no on-site full-scale test data for cemented-soil composite pile group. In this research, vertical static load tests were conducted on two isolated pile, two-pile group and six-pile group for long-core SDCM pile. The bearing behavior of long-core SDCM pile and the interaction between pile groups have been studied. The results indicate that the long-core SDCM single pile is a typical friction type pile, and cemented soil provides most of the lateral friction resistance for the bearing capacity. In pile groups, pile spacing is the main factor affecting the pile group effect. The model calculation results based on the equivalent pier method are verified using on-site test data and the key parameters in the pile group for long-core SDCM pile including pile spacing Sij, cemented soil Elastic modulus Ec and PHC pipe pile Elastic modulus Ep are analyzed using a mathematical model. Parameter analysis results indicate that the pile group interaction for long-core SDCM pile is mainly reflected in settlement. Group effect is inapparent at pile spacing greater than 4 D. The appropriate value of Ec and Ep are taken in the range of 0.8-1.0 GPa and 30-40 GPa.

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“…Experimental evidence from large-scale test setups could decrease the uncertainty associated with some of the advanced analysis methods and, in turn, increase the confidence in using appropriate analysis tools. However, large-scale tests on pile groups are rather limited and mostly focused on non-displacement concrete piles with raft (Bai et al 2006;Dai et al 2012). The recommended practice from the American Petroleum Institute (API 2011), the German standards for offshore structures (DIN 2017), and the standard DNV GL (2016) state that pile group effects should be assessed if the center-to-center spacing, a, is smaller than eight times the pile diameter, D. The D r a f t German standard for structures for wind turbine and platforms (DIN 2019) recommends using analytical or numerical analysis to estimate pile group effects and refers to the Recommendations on Piling (EA Pfähle) of the German Geotechnical Society (DGGT 2012) for more details on the topic.…”

Section: Introductionmentioning

confidence: 99%

Large-scale model tests of a single pile and two-pile groups for an offshore platform in sand

et al. 2021

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Estimating pile group efficiency for open-ended steel piles in small group arrangements is a challenging task for designers. This paper reports on the large-scale experimental campaign performed for the BorWin gamma offshore converter platform, which involved single piles and two-pile group systems on a scale of 1:10. The experimental works included installation, dynamic end-of-driving tests, dynamic restrike tests, and static load tests of a single pile and a pair of two-pile groups in densely compacted, artificially prepared homogeneous sand. The CPT profiles and the blow counts confirmed that the foundation systems are comparable to each other. The experimental results of the single pile system were compared with conventional design methods. Such comparison indicated that CPT-based methods and load-transfer methods are applicable at the considered model scale. The bearing capacity prediction obtained via the CAPWAP method is conservative with respect to the static capacity. A consistent setup effect can be detected by analyzing the complete dynamic loading session. The pile group efficiency for the given foundation system was found to be less than 1.0 at both very small and very large soil strains, while it equaled 1.0 at failure.

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Experimental Study on the Interaction Mechanism of Cap—Pile Group—Soil

Cited by 8 publications

References 0 publications

Load-Settlement Behaviour of Model Pile Groups in Sand Under Vertical Load

Load-Settlement Behaviour of Model Pile Groups in Sand Under Vertical Load

Vertical Bearing Behavior and Pile Group Effect for Cemented-Soil Composite Pile Groups Based on On-Site Experiments

Large-scale model tests of a single pile and two-pile groups for an offshore platform in sand

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