SECTION 2.
SUBSURFACE EVALUATION
1.
SUBSURFACE EVALUATION. This section presents the preliminary design
information required to conduct a soil exploration program, typical steps in
such a program, and the information to be reported.
2.
PRELIMINARY DESIGN INFORMATION. The preliminary design information
needed for a soil exploration program includes topographical features, the
anticipated loads and their locations, the nature of existing or future
adjacent buildings, and expected future conditions.
a.
Topographical Features. A complete facility layout sketch showing
the anticipated facility size and configuration, its location on the site,
the existing grades, the proposed final grades, the anticipated first floor
elevation, depth and extent of basement and other subgrade construction,
including anticipated minimum footing depths, will be furnished the
geotechnical engineer conducting the soils exploration program.
b.
Loading. The anticipated loads on individual foundations from
supporting structure and chamber components should be estimated, and their
relative locations indicated on the layout of the proposed facility. The
anticipated loads include the dead load of the building and chamber
components, the anticipated live loads on the building floors and roof, the
chamber operational cyclic loading such as the weight of water in wet
chambers, the movement of transportation equipment and overhead cranes and
other moving loads necessary for the chamber operation and expected sources
of impact and vibratory loadings.
c.
Existing Construction. The facility layout should show the
location of underground facilities such as sewers, gas lines, and power
lines. Existing buildings, wells, earth fills, excavations, retaining walls,
and other types of construction adjacent to the facility are also indicated
on the layout.
d.
Future Conditions. Planned or potential expansion of the facility
or changes in existing facilities should be indicated on the layout.
3.
SOIL BORING REQUIREMENTS. A subsurface investigation is required prior
to the design and construction of foundations for new hyperbaric facilities.
Once a specific site has been selected a program of soil borings, laboratory
tests, and an engineering analysis of potential foundation types must be
undertaken.
a.
Criteria. Complete guidance on subsurface investigations including
requirements for boring locations, type and depth is provided in NAVFAC
DM-7.1. See Reference 1, ASCE, Subsurface Investigation for Design and
Construction of Foundations of Buildings.
b.
Number and Spacing of Borings. The number of borings required will
depend greatly on the character of the site, the soil stratigraphy, the
extent of development in the immediate area and the uniformity of the soil
conditions. No specific minimum number of borings can be given for all types
of facilities.
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