Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat
We investigate through laboratory testing the volume change characteristics of peaty organic soil from Sherman Island, California under static conditions (consolidation, secondary compression) and post-cyclic conditions. Incremental consolidation tests indicate the material to be highly compressible...
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ftcdlib:qt2k54r08t 2023-05-15T18:19:21+02:00 Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat Shafiee, Ali Brandenberg, Scott J Stewart, Jonathan P 1 - 10 2013-03-06 application/pdf http://www.escholarship.org/uc/item/2k54r08t english eng eScholarship, University of California qt2k54r08t http://www.escholarship.org/uc/item/2k54r08t public Shafiee, Ali; Brandenberg, Scott J; & Stewart, Jonathan P. Meehan, Christopher L; Pradel, Daniel E; Pando, Miguel A; & Labuz, Joseph F eds. (2013). Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat. Geocongress 2013 -- Stability and Performance of Slopes and Embankments III, 231(1), 1 - 10. UCLA: UCLA Civil and Environmental Engineering. Retrieved from: http://www.escholarship.org/uc/item/2k54r08t Engineering Secondary compression Peat Dynamic testing article 2013 ftcdlib 2016-04-02T19:06:19Z We investigate through laboratory testing the volume change characteristics of peaty organic soil from Sherman Island, California under static conditions (consolidation, secondary compression) and post-cyclic conditions. Incremental consolidation tests indicate the material to be highly compressible (Cc = 3.9, Cr = 0.4) and prone to substantial ageing from secondary compression (Ca/Cc = 0.05 following virgin compression). Strain-controlled cyclic triaxial testing of the peat finds the generation of cyclic pore pressures for cyclic shear strain levels beyond approximately 0.5-1.0%, with the largest residual pore pressure ratios rur (cyclic residual pore pressure normalized by pre-cyclic consolidation stress) being approximately 0.2-0.4. Post cyclic volume change occurs from pore pressure dissipation and secondary compression. The level of post-cyclic secondary compression increases with rur. Many of these phenomena have not been documented previously and suggest the potential for seismic freeboard loss in levees due to mechanisms other than shear failure. Article in Journal/Newspaper Sherman Island University of California: eScholarship Sherman Island ENVELOPE(-100.000,-100.000,-73.050,-73.050) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Engineering Secondary compression Peat Dynamic testing |
spellingShingle |
Engineering Secondary compression Peat Dynamic testing Shafiee, Ali Brandenberg, Scott J Stewart, Jonathan P Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
topic_facet |
Engineering Secondary compression Peat Dynamic testing |
description |
We investigate through laboratory testing the volume change characteristics of peaty organic soil from Sherman Island, California under static conditions (consolidation, secondary compression) and post-cyclic conditions. Incremental consolidation tests indicate the material to be highly compressible (Cc = 3.9, Cr = 0.4) and prone to substantial ageing from secondary compression (Ca/Cc = 0.05 following virgin compression). Strain-controlled cyclic triaxial testing of the peat finds the generation of cyclic pore pressures for cyclic shear strain levels beyond approximately 0.5-1.0%, with the largest residual pore pressure ratios rur (cyclic residual pore pressure normalized by pre-cyclic consolidation stress) being approximately 0.2-0.4. Post cyclic volume change occurs from pore pressure dissipation and secondary compression. The level of post-cyclic secondary compression increases with rur. Many of these phenomena have not been documented previously and suggest the potential for seismic freeboard loss in levees due to mechanisms other than shear failure. |
format |
Article in Journal/Newspaper |
author |
Shafiee, Ali Brandenberg, Scott J Stewart, Jonathan P |
author_facet |
Shafiee, Ali Brandenberg, Scott J Stewart, Jonathan P |
author_sort |
Shafiee, Ali |
title |
Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
title_short |
Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
title_full |
Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
title_fullStr |
Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
title_full_unstemmed |
Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat |
title_sort |
laboratory investigation of the pre- and post-cyclic volume change properties of sherman island peat |
publisher |
eScholarship, University of California |
publishDate |
2013 |
url |
http://www.escholarship.org/uc/item/2k54r08t |
op_coverage |
1 - 10 |
long_lat |
ENVELOPE(-100.000,-100.000,-73.050,-73.050) |
geographic |
Sherman Island |
geographic_facet |
Sherman Island |
genre |
Sherman Island |
genre_facet |
Sherman Island |
op_source |
Shafiee, Ali; Brandenberg, Scott J; & Stewart, Jonathan P. Meehan, Christopher L; Pradel, Daniel E; Pando, Miguel A; & Labuz, Joseph F eds. (2013). Laboratory investigation of the pre- and post-cyclic volume change properties of Sherman Island peat. Geocongress 2013 -- Stability and Performance of Slopes and Embankments III, 231(1), 1 - 10. UCLA: UCLA Civil and Environmental Engineering. Retrieved from: http://www.escholarship.org/uc/item/2k54r08t |
op_relation |
qt2k54r08t http://www.escholarship.org/uc/item/2k54r08t |
op_rights |
public |
_version_ |
1766196425462382592 |