Geotechnical Engineering Slide Show

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Geotechnical Engineering Slide Show

• Dr. Adrian Rodriguez-Marek
• Spring 2005

Sources http//cee.engr.ucdavis.edu/faculty/boulan
ger/geo_photo_album/index.html http//www.geoengin
eer.org/gallery.html
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Soil Compaction
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Soil Compaction
Control of water content of soil is essential for
achieving good compaction
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Soil Compaction
Compaction at Los Vaqueros Dam, CA. The different
colored soils correspond to the upstream shell
(left side), core (darkest), filter, and drain
zone (lightest), and downstream shell.
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Compaction Equipment
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Deep Dynamic Compaction
When compaction must be achieved at larger
depths, surface compaction may not work.
Natural soil deposits and poor, heterogeneous
fills can be densified by dropping large weights
from great heights repeatedly on the ground
surface.
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What happens with poor compaction?
The upstream slope of the Lower San Fernando Dam,
in California, failed due to liquefaction during
the 1971 San Fernando earthquake. The dam was
constructed by "hydraulic filling," which
involves mixing the fill soil with a large amount
of water, transporting it to the dam site by
pipeline, depositing the soil and water on the
embankment in stages, and allowing the excess
water to drain away. The fill that remains is
loose, and is subject to liquefaction as the
result of earthquake shaking.
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What happens with poor compaction?
Slide in San Luis Dam, CA
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Consolidation and Settlement Can we predict this?
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Soil strength
Small slide in a highway cut
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Soil strength
Slide in Olympia, WA, due to liquefaction of soil
during the 2001 Nisqually Earthquake.
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Construction of Drilled Shafts
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Excavations in urban environments