Cyclic shear loading response of Fraser River Delta silt
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Sanin, Maria Victoria
issued: 2009-12-21T20:26:55Z
issued: 2005
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The cyclic shear response of silt obtained from a natural channel-fill soil deposit in the Fraser River Delta of British Columbia, Canada, was investigated using the direct simple shear (DSS) test apparatus. Constant volume cyclic DSS tests conducted on undisturbed silt specimens consolidated to a vertical stress similar to, or above, the in situ effective overburden stress exhibited cyclic mobility type progressive strain development and equivalent pore water pressure rise. The observations are similar to the behaviour observed for dense sand by others. The cyclic resistance ratio (CRR) of the tested material indicated no significant sensitivity to the initial confining stress level for stress levels below 200 kPa, suggesting that the response is similar to that of normally consolidated clay. The cyclic resistance ratio of the silt increased with increasing overconsolidation ratio (OCR) for OCR greater than 1.3. The silt specimens that developed high equivalent pore water pressures during cyclic loading, suffered significant volumetric strains during post-cyclic reconsolidation, indicating considerable changes in the particle fabric under cyclic loading. Repeated cyclic loading (re-liquefaction) tests conducted after post-cyclic reconsolidation displayed a reduction in CRR in comparison to that noted under first cyclic loading. The decrease in CRR due to the degradation of particle fabric as a result of previous shearing appears to have overshadowed any gain in CRR that would have taken place due to the reduction of void ratio during re-consolidation. The commonly used empirical liquefaction criteria displayed limitations in describing the cyclic response of the tested silt. Laboratory element testing that allows capturing the effect of most controlling parameters seems to remain as the more reliable approach for estimating liquefaction susceptibility of fine-grained soils.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/16928
note: CYCLIC SHEAR L O A D I N G RESPONSE OF FRASER RIVER D E L T A SILT By Maria Victoria Sanin B.Sc. Universidad Nacional De Colombia, 1999 A THESIS SUBMITTED IN PARTIAL F U L F I L L M E N T OF THE REQUIREMENTS FOR THE DEGREE OF M A S T E R OF APPLIED SCIENCE In THE F A C U L T Y OF G R A D U A T E STUDIES CIVIL ENGINEERING The University of British Columbia May 2005 © Maria Victoria Sanin 2005 A B S T R A C T The cyclic shear response of silt obtained from a natural channel-fill soil deposit in the Fraser River Delta of British Columbia, Canada, was investigated using the direct simple shear (DSS) test apparatus. Constant volume cyclic DSS tests conducted on undisturbed silt specimens consolidated to a vertical stress similar to, or above, the in situ effective overburden stress exhibited cyclic mobility type progressive strain development and equivalent pore water pressure rise. The observations are similar to the behaviour observed for dense sand by others. The cyclic resistance ratio (CRR) of the tested material indicated no significant sensitivity to the initial confining stress level for stress levels below 200 kPa, suggesting that the response is similar to that of normally consolidated clay. The cyclic resistance ratio of the silt increased with increasing overconsolidation ratio (OCR) for OCR greater than 1.3. The silt specimens that developed high equivalent pore water pressures during cyclic loading, suffered significant volumetric strains during post-cyclic reconsolidation, indicating considerable changes in the particle fabric under cyclic loading. Repeated cyclic loading (re-liquefaction) tests conducted after post-cyclic reconsolidation displayed a reduction in CRR in comparison to that noted under first cyclic loading. The decrease in CRR due to the degradation of particle fabric as a result of previous shearing appears to have overshadowed any gain in CRR that would have Cyclic Shear Loading Response of Fraser River Delta Silt 11 taken place due to the…
has type: Thesis/Dissertation
date issued: 2005-11
is shown at: 10.14288/1.0063358
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/16928