000018883 001__ 18883
000018883 005__ 20170118182245.0
000018883 04107 $$aeng
000018883 046__ $$k2017-01-09
000018883 100__ $$aStokoe, Kenneth
000018883 24500 $$aEvaluating the Dynamic Properties of the Material Skeleton of Liquefiable Sands At Low Confining Pressures

000018883 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018883 260__ $$b
000018883 506__ $$arestricted
000018883 520__ $$2eng$$aA next-generation, combined resonant column and torsional shear (RCTS) system has been developed to measure the cyclic and dynamic properties of all types of soils with high resolution, increased accuracy, and no complications from system compliance. In this study, the dynamic properties of the material skeleton of liquefiable sands from Christchurch, NZ, were evaluated at low, effective isotropic confining pressures, σ 0 ’ < 60 kPa. Bulk samples of poorly-graded fine sand were collected from one site and were transported to the University of Texas. Specimens were reconstituted in unsaturated, loose and medium-dense states for dynamic testing. The small-strain properties (V S – log σ 0 ’, G max – log σ 0 ’ and D – log σ 0 ’) and the nonlinear properties (G – log γ, G/G max – log γ, and D – log γ) were determined at confining pressures of 14, 28, and 55 kPa. Shear strains in these tests ranged over about 4.5 orders of magnitude (from 10-5 % to 0.2%). The small-strain log V S – log σ 0 ’ relationships are in good agreement with field V S – depth profiles. The expected in-situ G/G max – log γ relationship for saturated sand during earthquake shaking is calculated using G/G max values of unsaturated specimens in the laboratory and pore water pressures measured in the field at corresponding strains.

000018883 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018883 653__ $$ashear modulus; material damping; liquefiable sand; torsional resonant column; pore pressure generation

000018883 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018883 720__ $$aStokoe, Kenneth$$iKeene, Andrew$$iWang, Yaning
000018883 8560_ $$ffischerc@itam.cas.cz
000018883 8564_ $$s1820423$$uhttps://invenio.itam.cas.cz/record/18883/files/2407.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2407.
000018883 962__ $$r16048
000018883 980__ $$aPAPER