Experimental study of the undrained uplift behavior of drilled shaft foundations: Final report
An experimental study was conducted to evaluate the behavior of drilled shaft foundations subjected to undrained uplift loads. Tests were conducted on model shafts constructed in both large-scale and small-scale soil deposits. The small-scale models were constructed in 55 gallon drums, and the soils were prepared at a number of stress histories ranging from normally consolidated to heavily overconsolidated. The test shafts had dimensions of 89 mm (3.5 in.) diameter and 457 mm (18 in.) length. The large-scale models were constructed in a 2.1 m (7.0 ft) diameter and 2.9 m (9.5 ft) deep test pit and ranged in size from 89 to 305 mm (3.5 to 12 in.) diameter and 610 to 1220 mm (2 to 4 ft) long. Instrumentation used included butt load and displacement, soil stress, and soil pore water stress. Factors influencing shaft capacity examined were: in-situ state of stress, stress changes during construction, construction method, and moisture migration. From the test results and the analyses conducted, a consistent pattern of behavior emerged, which led to an effective stress design method for capacity, load transfer, and movement evaluation. Several case studies were used to illustrate the method and good correlation was observed, except in heavily overconsolidated soils which fail by cone breakout, a mode not included in the method. This newly developed method provides a rational framework for the effective stress analysis and design of drilled shafts in undrained uplift loading. 23 refs., 18 figs., 22 tabs.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA). Geotechnial Engineering Group; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6059126
- Report Number(s):
- EPRI-EL-5323; ON: TI88920053
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FOUNDATIONS
TESTING
POWER TRANSMISSION TOWERS
SOIL MECHANICS
EXPERIMENTAL DATA
OVERHEAD POWER TRANSMISSION
SCALE MODELS
SOIL-STRUCTURE INTERACTIONS
SOILS
DATA
INFORMATION
MECHANICAL STRUCTURES
MECHANICS
NUMERICAL DATA
POWER TRANSMISSION
STRUCTURAL MODELS
SUPPORTS
TOWERS
200301* - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)