Drilled Shafts - Construction Procedures and Design Methods by U.S. Department of Transportation

By U.S. Department of Transportation

This 1999 rfile used to be written as a source for individuals in a quick path overlaying the subject of development and layout of drilled shaft foundations for bridges and different constructions. it's the moment variation of the FHWA workbook on building and layout of drilled shafts.

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Additional resources for Drilled Shafts - Construction Procedures and Design Methods (Publication No. FHWA-IF-99-025)

Sample text

The drilled shaft design is to consist of an individual shaft supporting each of the three columns. Details of the project requirements, subsurface information, and foundation design are presented in total in Appendix A of this manual and referenced throughout the manual where relevant aspects of design issues are discussed. 2 TYPES OF DEEP FOUNDATIONS Drilled shaft foundations are broadly described as cast-in-place deep foundation elements constructed in a drilled hole that is stabilized to allow controlled placement of reinforcing and concrete.

Therefore, the site characterization process must be sufficient to define the variability of soil and rock engineering properties used in the LRFD design methods presented in subsequent chapters of this manual. Table 2-1 summarizes the information needed for design of drilled shafts. For each characteristic or property and for each type of geomaterial, the means or method(s) used to obtain the information are identified. The information required for design of drilled shafts can be divided into three general categories: (1) subsurface stratigraphy and groundwater conditions, (2) index properties and classification of geomaterials, and (3) specific engineering strength and deformation properties.

2001). For these reasons, it is important not to rely exclusively on seismic refraction, but to verify subsurface stratigraphy in several borings and correlate the seismic refraction signals to the boring results. One of the most effective applications of seismic refraction is to provide depth to bedrock over a large area, eliminating some of the uncertainty associated with interpolations of bedrock depths for locations between borings. A recently developed method based on enhanced seismic refraction shows promise for characterizing sites requiring depth to bedrock information and for differentiating subsurface boundaries between soft or loose soils and stiff or dense soils.

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