Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles

Abdalla M. Harraz, William N. Houston, Sandra Houston, Kenneth D. Walsh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Drilled shafts have become the preferred deep foundation element in many arid environments where coarse material is prevalent, including the southwest USA, because soil conditions are usually unfavorable to driven piles, scour depths on the ephemeral river channels are quite large, and there is increased confidence in the bearing layer afforded by the drilled shaft construction process. Finite element analyses were performed on two case history studies of axially loaded concrete drilled shafts founded in sand, gravel, and cobbles soils (SGC). A parametric study was conducted to determine the most important soil parameters controlling the axial capacity of drilled shafts. The soil parameters used in this study are: soil angle of internal friction, soil dilation, soil modulus, initial coefficient of lateral earth pressure at rest, and angle of internal friction between soil and shaft. The axial bearing capacity and skin friction load were determined in each case. It was found that the soil angle of internal friction, soil dilation, coefficient of friction between soil and shaft, and soil modulus, E, are the most important parameters controlling the behavior of axial loaded drilled shaft in SGC soils. The ratio between horizontal stresses and vertical stresses at failure is completely different from the coefficient of lateral earth pressure at rest.

Original languageEnglish (US)
Title of host publicationProceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment
Pages1987-1991
Number of pages5
Volume4
StatePublished - 2005
Event16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment, ICSMGE 2005 - Osaka, Japan
Duration: Sep 12 2005Sep 16 2005

Other

Other16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment, ICSMGE 2005
CountryJapan
CityOsaka
Period9/12/059/16/05

Fingerprint

Gravel
sand and gravel
gravel
shaft
Sand
sand
Soils
soil
friction
Internal friction
dilation
earth pressure
parameter
Bearings (structural)
Earth (planet)
dry environmental conditions
Scour
arid environment
Skin friction
scour

ASJC Scopus subject areas

  • Soil Science
  • Geotechnical Engineering and Engineering Geology

Cite this

Harraz, A. M., Houston, W. N., Houston, S., & Walsh, K. D. (2005). Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles. In Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment (Vol. 4, pp. 1987-1991)

Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles. / Harraz, Abdalla M.; Houston, William N.; Houston, Sandra; Walsh, Kenneth D.

Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment. Vol. 4 2005. p. 1987-1991.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Harraz, AM, Houston, WN, Houston, S & Walsh, KD 2005, Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles. in Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment. vol. 4, pp. 1987-1991, 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment, ICSMGE 2005, Osaka, Japan, 9/12/05.
Harraz AM, Houston WN, Houston S, Walsh KD. Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles. In Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment. Vol. 4. 2005. p. 1987-1991
Harraz, Abdalla M. ; Houston, William N. ; Houston, Sandra ; Walsh, Kenneth D. / Parameters controlling the capacity of axially loaded drilled shaft foundations in sand, gravel, and cobbles. Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment. Vol. 4 2005. pp. 1987-1991
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AB - Drilled shafts have become the preferred deep foundation element in many arid environments where coarse material is prevalent, including the southwest USA, because soil conditions are usually unfavorable to driven piles, scour depths on the ephemeral river channels are quite large, and there is increased confidence in the bearing layer afforded by the drilled shaft construction process. Finite element analyses were performed on two case history studies of axially loaded concrete drilled shafts founded in sand, gravel, and cobbles soils (SGC). A parametric study was conducted to determine the most important soil parameters controlling the axial capacity of drilled shafts. The soil parameters used in this study are: soil angle of internal friction, soil dilation, soil modulus, initial coefficient of lateral earth pressure at rest, and angle of internal friction between soil and shaft. The axial bearing capacity and skin friction load were determined in each case. It was found that the soil angle of internal friction, soil dilation, coefficient of friction between soil and shaft, and soil modulus, E, are the most important parameters controlling the behavior of axial loaded drilled shaft in SGC soils. The ratio between horizontal stresses and vertical stresses at failure is completely different from the coefficient of lateral earth pressure at rest.

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