DRILLED SHAFTS FOR BRIDGE FOUNDATIONS

[OSHO]

DRILLED SHAFTS FOR BRIDGE FOUNDATIONS

Author: PSC ASSOCIATES, INC. | Size: 69 MB | Format: PDF | Publisher: National Technical Information Service | Year: 1993 | pages: 350

Drilled shafts for many situations offer an economical alternative to driven piles. The Federal Highway Administration (FHW A) has spent considerable time and money in research and developing design and construction guidelines for drilled shafts. However, the full potential of the technology may not be realized because of both the uncertainty of the effects of construction on the actual service behavior and the limited knowledge on either reliable quality control tests to locate and evaluate defects, or inexpensive load test procedures.

The overwhelming majority of drilled shafts built to date have been constructed safely and have perfonned as their designers anticipated. However, the very occasional reported failures highlight the variables and unknowns present when working underground, particularly in water-bearing and potentially caving soils. This results in a lower risk tolerance for a single or double shaft supported pier compared to mUltiple pile
supported foundations.

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