State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences (2021) / Chapter Skim
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Appendix E: Glossary
Appendix E: Glossary
Pages 261-270
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From page 261... ...
Cone penetration test (CPT) : An in situ soil testing procedure in which a standardized rod with a conical tip is pushed into the soil at a constant rate.
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From page 262... ...
: The seismic demand induced at a particular depth in the soil, usually expressed as the average earthquake-induced cyclic shear stress (τcyc) divided by the initial vertical effective stress (𝜎 ′ )
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From page 263... ...
In some cases this zone may be a discrete horizon, while in others it may be distributed through thicker sedimentary deposits. Liquefaction: The phenomena of seismic generation of excess porewater pressures and consequent softening and loss of strength of saturated granular soils, typically manifested by fluidlike behavior.
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From page 264... ...
Modulus reduction curve: A curve relating the reduction of the soil stiffness, as measured by the shear modulus to the amplitude of shear strain. Multichannel analysis of surface waves (MASW)
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From page 265... ...
Post-liquefaction settlement: Settlement that occurs following soil liquefaction, usually due to dissipation of excess porewater pressure. Primary wave: A stress wave in the body of a geologic deposit in which the particle motion is in parallel with the direction of wave propagation.
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From page 266... ...
Soil behavior type index (Ic) : A parameter derived from the normalized tip and frictional resistance in the cone penetration test and used to infer soil type.
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From page 267... ...
Threshold shear strain: The cyclic shear strain at which residual excess porewater pressures are generated. Triaxial test: A laboratory procedure in which a cylindrical sample is loaded with independent control of the vertical and horizontal loading.
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From page 268... ...
γcyc cyclic shear strain ν Poisson's ratio σ stress (subscripts indicate direction, such as v for vertical, and prime indicates effective stress) τcyc cyclic shear stress ψ state parameter CB correction factor for boring diameter in SPT CE correction factor for energy ratio in SPT CN correction factor for overburden in SPT CPT cone penetration test CR correction factor for rod length in SPT CRR cyclic resistance ratio CS correction factor for sampler liner in SPT CSR cyclic stress ratio D critical damping ratio DR relative density E Young's modulus, modulus of elasticity e void ratio ec critical void ratio F normalized frictional resistance from CPT fc frictional sleeve resistance in cone penetration test G shear modulus
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From page 269... ...
(N1) 60 N value corrected to effective vertical stress of 1 atmosphere and 60% of the free fall energy reaching the sampler PGA peak horizontal ground acceleration PLHA Probabilistic Liquefaction Hazard Analysis PSHA Probabilistic Seismic Hazard Analysis Q normalized tip resistance from CPT qc tip resistance in cone penetration test rd stress reduction coefficient ru excess pore-pressure ratio sa spectral acceleration SPT standard penetration test sv spectral velocity u porewater pressure vp, Vp p-wave velocity Vs shear wave velocity
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