Keywords and Phrases
Consolidated undrained triaxial compression test for cohesive soils (CU test)
"A considerable amount of research has been conducted on the strength of both clays and sands while the research conducted on low plasticity silt has been very limited. The objective of this study was to evaluate the undrained behavior of monotonically loaded low plasticity silt. The well understood stress-strain behavior of sand-like and clay-like soils was compared to the behavior of low plasticity silts. In particular, failure conditions and the steady state behavior of low plasticity silt were compared to the conditions seen in sand-like and clay-like soils.
The soil used in the study program was obtained from the Mississippi River Valley and consisted of modified loessial silt deposits with a plasticity index of about 6. In order to achieve a soil fabric similar to its natural deposition samples were consolidated from slurry using a consolidometer. To ensure minimum sample disturbance, special thin-walled shelby tubes were designed and constructed.
The effects of the initial density, confinement pressure, and overconsolidation ratio were evaluated in a triaxial testing program. A strong dilative behavior similar to that of sandy soils was observed. This dilative behavior continued until the silt specimens exited their saturation state, which caused the pore water pressure to be constant and show apparent steady state behavior due to the compressibility of air.
Although steady state was not observed in the tested silt, the limit between the initial contraction and dilation was clearly located and quantified. Phase transformation of the low plasticity silt was observed at an overconsolidation ratio of about 2"--Abstract, page iii.
Stephenson, Richard Wesley
Rogers, J. David
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
United States. Bureau of Reclamation
University of Missouri--Rolla
xii, 82 pages
Mississippi River Valley
© 2006 Ali Mohammad Izadi, All rights reserved.
Thesis - Restricted Access
Materials -- Compression testing
Shear strength of soils -- Testing
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b5850322~S5
Izadi, Ali Mohammad, "Behavior of undrained monotonically loaded low plasticity silt under triaxial compression" (2006). Masters Theses. 5890.
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