Construction Method Effects on Axial Drilled Shaft Performance

Camp, William M.; Brown, Dan; Mayne, Paul W.

doi:10.1061/40601(256)14

Cited by 17 publications

(2 citation statements)

References 2 publications

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“…Many series of undrained triaxial compression (CIUC) tests with porewater pressure measurements were performed on the Cooper Marl by several consulting groups and testing firms, with over 100 triaxial tests completed. Results indicate that generally ranges from 40°to 46°with a mean = 43° (Camp et al 2002a(Camp et al , 2002b. The calcareous clay studied at the Arthur Ravenel Bridge site has a mean Fig.…”

Section: Cooper Marl Charleston South Carolinamentioning

confidence: 97%

Effective friction angle of clays and silts from piezocone penetration tests

Ouyang

Mayne

2018

Can. Geotech. J.

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An existing effective stress limit plasticity solution for piezocone penetration tests (CPTu) is calibrated to evaluate the effective stress friction angle ([Formula: see text]) for undrained conditions for a variety of fine-grained soils ranging from natural lean to plastic clays and clayey silts from marine, alluvial, lacustrine, deltaic, and glaciofluvial origins. Data from 105 clay sites are compiled to examine the CPTu-interpreted [Formula: see text] values in comparison with laboratory benchmark values obtained from undrained consolidated anisotropic (CAUC) and undrained compression (CIUC) triaxial tests made on undisturbed samples. An approximate inversion of the theoretical solution is developed to allow profiles of [Formula: see text] to be evaluated with depth. Five well-documented case studies in Illinois, Louisiana, South Carolina, Ireland, and Massachusetts are presented to illustrate the application of the solution. Lastly, results from 1g chamber tests involving kaolin and kaolinitic–silica mixtures tested by miniature piezocone probes are shown for additional verification.

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Section: Cooper Marl Charleston South Carolinamentioning

confidence: 97%

Effective friction angle of clays and silts from piezocone penetration tests

Ouyang

Mayne

2018

Can. Geotech. J.

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“…Yao and Gerwick (2004) describe the desirability of underwater concrete to flow laterally in a "bulged" flow pattern with a relatively flat, smooth top surface rather than as a "layered" flow pattern which can result in steeply sloped and rugged top surface that increase the exposure of concrete surfaces to water. Deese and Mullins (2005) and Camp et al (2002) describe relative differences in concrete levels within and outside the reinforcement that are attributed to the inability of the concrete to readily pass through the cage. Even if the concrete has adequate workability, the aggregate size and shape must be such that the mixture passes readily through the reinforcement.…”

Section: Figure 1 Concrete Flow In Under Tremie Placementmentioning

confidence: 99%

High Performance Concrete and Drilled Shaft Construction

Brown

Schindler

2007

Contemporary Issues in Deep Foundations

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Drilled shaft foundations on major bridge projects often require the use of underwater placement of large volumes of concrete through densely placed rebar, with the cage often made even more congested with the placement of additional tubes for postconstruction integrity testing. Such conditions represent the most difficult circumstances for constructors in terms of concrete placement to achieve a shaft which is free of defects or anomalies in the integrity testing. The concept of "high performance" for drilled shaft concrete is that the mixture should address the most critical performance requirements related to workability. This paper describes the important considerations in concrete mixture design for drilled shaft construction including the use of admixtures and mixture components associated with self-consolidating concrete (SCC). Some case histories of difficulties associated with concrete are also described.

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