Geoscience Reference
In-Depth Information
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Evaluation of existing finite difference (FD), FE and boundary element (BE) codes
forsiteand SSI effects.
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Investigation of the beneficial or detrimental role of SSI effects in presence of
yielding of the superstructure lying over a very soft soil.
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Examination of the nature and the effect of the waves transmitted by the oscillation
of the superstructure tothefoundation level and the surrounding soil.
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Scrutinize the effect of foundation flexibility (i.e. footing/single cast-in-drilled-hole
piles towards pilegroup) on theextent of dynamic SSI phenomena.
Identificationofpossiblecodeimplicationsofsoil-structureinteractionphenomena.
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2.2. UCSB NEES GARNER VALLEY AND WILDLIFE TEST SITES
(DR. JAMIESONSTEIDL, PI)
AttheUniversityofCalifornia,SantaBarbara(UCSB),theGarnerValleyandtheWildlife
refugesiteshavebeeninstrumentedandareavailableforresearch(http://nees.ucsb.edu/).
A brief description is included below (material below is extracted from the website
http://nees.ucsb.edu/).
2.2.1. Soil and seismic characteristics at Garner Valley
The NEES field site in the Garner Valley (Figure 5.6) is very well suited to the study of
soil-foundation-structure interaction and liquefaction. The area is located near several
active faults on low density alluvial soil with a near surface water table. The site has
been thoroughly characterized recently through borehole geotechnical tests and in other
studies over thelast 10 years.
Additionally,thevalleybedrockisbasinshapedandlatearrivingsurfacewaveshavebeen
observed (likely Love waves), travelling from the edge of the basin. The torsions gener-
atedonfoundationsbyLovewavesareconsideredtobeespeciallydestructive.Thus,this
field siteprovides a possibility to observe Love waves on a fully instrumented structure.
2.2.2. Geologic conditions
The upper 18-25m consist of soil rich in organics and alluvium. Soil types present are
siltysand,sand,clayeysand,andsiltygravel.Thereisagradualtransitionfromalluvium
Fig. 5.6. Garner Valley SFSI field siteand SFSI structure