Bearing Capacity of Auger‐Cast Piles in Sand

Neely, William J.

doi:10.1061/(asce)0733-9410(1991)117:2(331)

Cited by 32 publications

(3 citation statements)

References 5 publications

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“…One method, which proved to be relatively accurate for the tests in the data base that were conducted in mixed clay and sand profiles, was the Coyle-Castello method for driven piles with augmentation for clay layers using Tomlinson's method (Coyle and Castello, 1981). Another method, which proved to be accurate within the data base for piles in sand profiles was the method of Neely (1991). However, the most accurate methods (defined as those with the smallest coefficient of variation in the ratio of measured to predicted capacities and the smallest average error) were the TxDOT UU triaxial compression test (TAT) method for drilled shafts in clay soils (O'Neill et al, 1999) and the FHWA method for drilled shafts (Reese and O'Neill, 1988) for sand profiles and mixed sand and clay profiles.…”

Section: Estimation Of Ultimate Resistance and Comparisons With Measumentioning

confidence: 99%

Axial Performance of ACIP Piles in Texas Coastal Soils

O’Neill¹,

Ata²,

Vipulanandan³

et al. 2002

Deep Foundations 2002

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Methods were evaluated for assessing axial compressive capacities of augered, cast-inplace (ACIP) piles in the Pleistocene terrace deposits of the Texas Gulf Coast and Recent to Modern alluvial soils. The study involved a combination of data base analyses and the performance of new loading tests on instrumented piles. The results in sand deposits mirrored earlier studies that indicated that common methods used for designing drilled shafts are also appropriate for ACIP piles, although the patterns of load transfer in the tested piles suggested zones of both lower load transfer (running sands below the water table) and higher load transfer (compacted surface soils) than would be expected in drilled shafts. The action of drilling and grouting resulted in net increases in lateral effective stresses in the soil around the tested piles, near the ground surface, where such measurements were made. In overconsolidated clays, slightly higher unit side resistances were inferred for ACIP piles than are predicted by common drilled shaft design methods. However, common drilled shaft design methods, notably the FHWA method, produced generally accurate capacities for mixed soil profiles.

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Section: Estimation Of Ultimate Resistance and Comparisons With Measumentioning

confidence: 99%

Axial Performance of ACIP Piles in Texas Coastal Soils

O’Neill¹,

Ata²,

Vipulanandan³

et al. 2002

Deep Foundations 2002

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“…For instance, Gavin et al [3] conducted in-field compression and tension load tests on the CFA piles in boulder clay, and very high shaft resistances (>400 kPa) were observed from the interpretation of the strain gauge reading. Neely [4] analyzed the bearing performances of 66 CFA piles in sand from the literature. He found that the shaft resistance is independent of the relative density of sand, but strongly correlated to the cone penetration test (CPT) or standard penetration test (SPT) result.…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Axial Bearing Performance and Mechanism of Continuous Flight Auger Pile in Weathered Granitic Soils

Zhang,

Li,

Zhang

et al. 2023

Buildings

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Axial bearing performance and mechanism of continuous flight auger (CFA) pile in weathered granitic soils, i.e., a widespread special soil in South China, were investigated by field test in this study. Load–settlement responses of four CFA piles were examined, and evolutions of shaft/base resistances were captured by ultra-weak fiber Bragg gratings (UWFBG) with a reflectivity ≤−40 dB. Performances of CFA piles were compared with those of a slurry displacement (SD) pile at the same site, thirteen pretensioned spun high-strength concrete (PHC) piles in the literature and empirical data in design code. Test results show that the ultimate bearing capacity of the CFA pile is highest among different pile types, and typically is twice that of the SD pile. Again, CFA pile produces the highest shaft resistances at 140 kPa and 153 kPa in two weathered granitic soils, while the base resistance of 3080 kPa is between those of the SD pile and the PHC pile. By field excavation, the superior mechanism of the CFA pile is suggested to avoid the formation of in-between bentonite layers and prevent preferential baseflow along fissures, both of which can weaken the soil–pile interface. Overall, this study provides fundamental data through UWFBG and explanations based on field observations which underpin the need for developing a design code specified for CFA piles in South China.

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“…Significant amount of research has been devoted to the evaluation of the static capacity of APG systems as discussed in [4][5][6][7][8][9][10][11]. These research efforts confirmed the reliability of the APG piles under various soil conditions.…”

Section: Introductionmentioning

confidence: 99%