pile foundation
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07-02-2011, 03:25 AM

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Design of Pile Foundations

.pdf   Design of Pile Foundations.pdf (Size: 906.32 KB / Downloads: 117)


This manual provides information, foundation exploration and
testing procedures, load test methods, analysis techniques, design criteria
and procedures, and construction considerations for the selection, design, and
installation of pile foundations. The guidance is based on the present state
of technology for pile-soil-structure-foundation interaction behavior. This
manual provides design guidance intended specifically for geotechnical and
structural engineers and essential information for others interested in understanding
construction techniques related to pile behavior during installation.
The understanding of pile foundation behavior is actively expanding by ongoing
research, prototype, model pile, and pile group testing and development of
more refined analytical models. However, this manual is intended to provide
examples and procedures of proven technology. This manual will be updated as
changes in design and installation procedures are developed.


2-1. General. Many factors must be considered when selecting an appropriate
foundation for a hydraulic structure. This chapter presents criteria and
methods for selecting the best type of foundation. Information is presented
to identify the feasible foundation alternatives for more detailed study. The
final selection should be based on an evaluation of engineering feasibility
and comparative costs for the potential alternatives considering such factors
as safety, reliability, constructability, and life cycle performance. This
chapter also presents general criteria for feature design. Such criteria
pertain to the type and function of the structure, the nature of the applied
loads, and the type of foundation material. The requirements for a subsurface
investigation program are also presented.

Nature of Loadings.

a. Usual. Usual loads refer to conditions which are related to the primary
function of a structure and can be reasonably expected to occur during
the economic service life. The loading effects may be of either a long term,
constant or an intermittent, repetitive nature. Pile allowable loads and
stresses should include a conservative safety factor for such conditions. The
pile foundation layout should be designed to be most efficient for these

Foundation Material.

a. Known Data. After a general site for a project and implimentation is selected, the designer
should make a site visit to examine the topography at the site. Rock
outcrops or highway cuts on or near the site may provide valuable information
of the subsurface conditions. An examination of existing structures in the
vicinity may also provide information. A visit to the local building department
may provide foundation information and boring logs for nearby buildings.
The highway department may have soil and geological information in the area
for existing roads and bridges. Valuable soil and geological information can
be obtained from other governmental agencies, such as the United States
Geological Survey (USGS), Soil Conservation Service (SCS), Bureau of Records,
etc., for even remotely located areas. Colleagues may be able to provide
information on project and implimentations they have worked on in the area. Check the files for
previous jobs your office might have built or explored in the area.

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