Abstract
The paper reports the results of laboratory testing of dense sandy gravel carried out on large dimension undisturbed samples, obtained by means of in situ freezing technique. The specimens, 290 mm in diameter and 600 mm high, have been subjected to undrained cyclic triaxial tests carried out in isotropically and anisotropically consolidated conditions aimed at investigating sandy gravel susceptibility to cyclic mobility and plastic strain accumulation during earthquake induced vibrations. The quality of the undisturbed samples was corroborated by comparing the field shear wave velocities against those inferred from bender element tests, carried out in the triaxial apparatus after the specimen consolidation. The cyclic tests were supported by a series of monotonic undrained and drained triaxial tests performed on isotropically and anisotropically consolidated specimens to help in their more rational interpretation. The tests yielded valuable information as to the susceptibility of the sandy gravel in hands to cyclic mobility and plastic strain accumulation during earthquake loading.
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Abbreviations
- CRR:
-
Cyclic resistance ratio
- CSR:
-
Cyclic stress ratio
- CU :
-
Uniformity coefficient
- D:
-
Diameter of the specimen
- D10 :
-
Particle size at which 10 % of the soil weight is finer
- D30 :
-
Particle size at which 30 % of the soil weight is finer
- D50 :
-
Mean particle size, i.e. particle size at which 50 % of the soil weight is finer
- D60 :
-
Particle size at which 60 % of the soil weight is finer
- e:
-
Current void ratio
- ec :
-
Void ratio after the consolidation phase
- eo :
-
Initial void ratio
- ess :
-
Void ratio at steady state
- E′:
-
Drained secant Young’s modulus
- Eo :
-
Initial Young’s modulus
- Go :
-
Initial shear modulus
- H:
-
Height of the specimen
- k:
-
Coefficient of permeability
- Ko :
-
Coefficient of earth pressure at rest
- Kf :
-
Bulk modulus of the pore fluid
- Mc :
-
Slope of the steady state line in the q–p plane for compression loading
- Me :
-
Slope of the steady state line in the q–p′ plane for extension loading
- Md :
-
Slope of the phase transformation line in the q–p′ plane
- n:
-
Porosity
- N:
-
Number of cycles
- p′:
-
Current mean effective stress
- pa :
-
Reference atmospheric pressure
- p′c :
-
Mean effective stress after the consolidation phase
- p′ss :
-
Mean effective stress at steady state
- q:
-
Current deviatoric stress
- qc :
-
Deviatoric stress after the consolidation phase
- qs :
-
Static deviatoric stress
- qss :
-
Deviatoric stress at steady state
- Ru :
-
Pore pressure ratio
- SSL:
-
Steady state line
- VS :
-
Shear wave velocity
- VS1 :
-
Normalized shear wave velocity
- Δqc :
-
Cyclic deviatoric stress increment
- Δu:
-
Excess pore pressure
- ΔV:
-
Volume change
- \({\varepsilon_{\rm a}}\) :
-
Axial strain
- \({\varepsilon_{\rm a}^{\rm DA}}\) :
-
Double amplitude cyclic axial strain in tests with significant stress reversal
- \({\varepsilon_{\rm a}^{\rm PS}}\) :
-
Cumulated peak axial strain in tests with no or limited stress reversal
- \({\varepsilon_{\rm v}}\) :
-
Volumetric strain
- \({\varphi'_{\rm ss}}\) :
-
Angle of shear resistance at steady (critical) state
- γW :
-
Unit weight of water
- νsk :
-
Poisson’s ratio of the soil skeleton
- θ:
-
Lode’s angle
- ρs :
-
Mass density of the soil particles
- ρt :
-
Bulk mass density
- ρf :
-
Density of the pore fluid
- σ′a :
-
Axial effective stress
- σ′r :
-
Radial effective stress
- σ′vo :
-
In situ vertical effective stress
- \({\psi}\) :
-
State parameter (Been and Jefferies 1985)
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Fioravante, V., Giretti, D., Jamiolkowski, M. et al. Triaxial tests on undisturbed gravelly soils from the Sicilian shore of the Messina Strait. Bull Earthquake Eng 10, 1717–1744 (2012). https://doi.org/10.1007/s10518-012-9374-7
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DOI: https://doi.org/10.1007/s10518-012-9374-7