Medium to Large-Strain Dynamic Property of Mixed Soils
| Autor: | Tai-Chen Lai, 賴泰辰 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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