Medium to Large-Strain Dynamic Property of Mixed Soils
Date Issued
2014
Date
2014
Author(s)
Lai, Tai-Chen
Abstract
There are many factors affecting the dynamic soil properties, including soil density,
confining pressure, over-consolidation ratio, plasticity, mineralogy, and particle shape,
etc. This research examined the dynamic behavior of pure sand and sand-silt mixture by
a series of strain-controlled cyclic triaxial and bender element tests. Materials used in
this study were pure quartz sand and sand with various percentages of quartz silt (5%
and 10%). All tests were carried out under the same initial dry density. Effects of initial
effective confining stress and strain amplitude are considered.
From the test results, shear modulus of the mixed soil decreases as shear strain
increases. However, damping ratio increases with increasing shear strain amplitude.
This trend is consistent with past research on pure sand or pure clay materials. . In
addition, when the initial effective confining stress increases from 100kPa to 300kPa,
the mixed soil would have a higher shear modulus and become more linear (i.e. less
modulus reduction and less damping). Lastly, increasing fines content would lower the
shear modulus and increase the damping ratio.
Subjects
剪力摩數
阻尼比
動力三軸試驗
剪力波原件
最大剪力摩數
Type
thesis
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