A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Liquefaction Resistance of Clean and Silty Sands from Cone Penetration Resistance
Liquefaction of soils is one of the main hazards associated with earthquakes. Current research and field observations after recent earthquakes in Japan, Turkey and Taiwan showed that liquefaction is not limited to clean sands and that sands containing small percentages of nonplastic fines also liquefy. Curves of cyclic resistance ratio CRR vs. stress-normalized cone resistance qc1 are developed in this study for clean and nonplastic silty sands from an extensive laboratory testing program and a well-tested penetration resistance analysis based on cavity expansion theory. Undrained cyclic triaxial tests were carried out on slurry-deposited silty sand specimens reconstituted within a wide range of relative densities and gradations varying from 0 to 15% (by weight) of nonplastic silt. From these tests, the relationship of CRR with the soil state and fines content was determined. Values of normalized cone penetration resistance qc1 were calculated for the various gradations using the penetration resistance analysis described above. Input parameters for the analysis include state variables, such as the relative density and the vertical and horizontal effective stresses; and intrinsic soil variables, such as the critical state friction angle, the parameters Q and R appearing in Bolton's correlation for the peak friction angle, and the small-strain shear modulus correlation parameters Cg, eg, and ng. The obtained (CRR)7.5-qc1 curve for clean sand follows closely widely-accepted empirical relationships. The proposed curves for nonplastic silty sands lie to the right of the clean sand curve as a consequence mostly of the fact that cone penetration resistance for the nonplastic silty sands tested in this study increases more with increasing silt content than does liquefaction resistance.
Liquefaction Resistance of Clean and Silty Sands from Cone Penetration Resistance
Liquefaction of soils is one of the main hazards associated with earthquakes. Current research and field observations after recent earthquakes in Japan, Turkey and Taiwan showed that liquefaction is not limited to clean sands and that sands containing small percentages of nonplastic fines also liquefy. Curves of cyclic resistance ratio CRR vs. stress-normalized cone resistance qc1 are developed in this study for clean and nonplastic silty sands from an extensive laboratory testing program and a well-tested penetration resistance analysis based on cavity expansion theory. Undrained cyclic triaxial tests were carried out on slurry-deposited silty sand specimens reconstituted within a wide range of relative densities and gradations varying from 0 to 15% (by weight) of nonplastic silt. From these tests, the relationship of CRR with the soil state and fines content was determined. Values of normalized cone penetration resistance qc1 were calculated for the various gradations using the penetration resistance analysis described above. Input parameters for the analysis include state variables, such as the relative density and the vertical and horizontal effective stresses; and intrinsic soil variables, such as the critical state friction angle, the parameters Q and R appearing in Bolton's correlation for the peak friction angle, and the small-strain shear modulus correlation parameters Cg, eg, and ng. The obtained (CRR)7.5-qc1 curve for clean sand follows closely widely-accepted empirical relationships. The proposed curves for nonplastic silty sands lie to the right of the clean sand curve as a consequence mostly of the fact that cone penetration resistance for the nonplastic silty sands tested in this study increases more with increasing silt content than does liquefaction resistance.
Liquefaction Resistance of Clean and Silty Sands from Cone Penetration Resistance
Carraro, J. A. H. (author) / Bandini, P. (author) / Salgado, R. (author)
Geo-Frontiers Congress 2005 ; 2005 ; Austin, Texas, United States
2005-10-09
Conference paper
Electronic Resource
English
Liquefaction Resistance of Clean and Nonplastic Silty Sands Based on Cone Penetration Resistance
| British Library Online Contents | 2003
Liquefaction Resistance of Clean and Nonplastic Silty Sands Based on Cone Penetration Resistance
| Online Contents | 2003
Cone penetration tests in unsaturated silty sands
| Online Contents | 2016
Cone penetration tests in unsaturated silty sands
| Online Contents | 2015
Cone penetration tests in unsaturated silty sands
| British Library Online Contents | 2016