Geoscience Reference
In-Depth Information
Evaluation of existing finite difference (FD), FE and boundary element (BE) codes
forsiteand SSI effects.
Investigation of the beneficial or detrimental role of SSI effects in presence of
yielding of the superstructure lying over a very soft soil.
Examination of the nature and the effect of the waves transmitted by the oscillation
of the superstructure tothefoundation level and the surrounding soil.
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.
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
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