Journal ArticleDOI
Liquefaction and flow failure during earthquakes.
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In this article, two aspects of seismically-induced liquefaction are discussed which are of vital engineering significance: the triggering condition and the consequences of liquidation, and the evaluation of residual strength requires a better understanding of undrained sand behaviour.Abstract:
Two aspects of seismically-induced liquefaction are discussed which are of vital engineering significance: the triggering condition and the consequences of liquefaction. The triggering condition is examined with respect to liquefaction analysis, note being taken of the onset condition which is governed by cyclic strength. Consequences of liquefaction are discussed with respect to post-seismic stability analysis, in which the residual strength plays a major role. Procedures used for liquefaction analysis based on the results of in situ sounding tests are introduced, and the applicability of this method for estimating associated ground settlements is discussed. The evaluation of residual strength requires a better understanding of undrained sand behaviour. Results of extensive laboratory rests on Japanese standard sand are examined and new index parameters are proposed to quantify undrained sand behaviour better. The results of laboratory tests on silty sands are examined in the same way. AH the results are...read more
Citations
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Particle Shape Effects on Packing Density, Stiffness, and Strength: Natural and Crushed Sands
TL;DR: In this paper, the effects of particle shape on packing density and on the small-to-large strain mechanical properties of sandy soils were explored. But particle shape emerges as a significant soil index property that needs to be properly characterized and documented, particularly in clean sands and gravels.
Journal ArticleDOI
Evaluating cyclic liquefaction potential using the cone penetration test
TL;DR: In this article, the phenomena of soil liquefaction are described, and suitable definitions and definitions are provided for these phenomena are reviewed and an update of the existing definitions is provided.
Journal ArticleDOI
Dilatancy for cohesionless soils
X. S. Li,Yannis F. Dafalias +1 more
TL;DR: In this article, a theory was presented that treats the dilatancy as a state-dependent quantity within the framework of critical state soil mechanics, which is a major obstacle to unified modelling of the response of a cohesionless material over a full range of densities and stress levels (before particle crushing).
Journal ArticleDOI
The steady state of sandy soils
Ramon Verdugo,Kenji Ishihara +1 more
TL;DR: In this article, an alternative procedure to evaluate the void ratio of triaxial test samples is introduced, which is recommended particularly when very loose samples are tested and an important volume change occurring during the saturation process is expected.
Journal ArticleDOI
Undrained Fragility of Clean Sands, Silty Sands, and Sandy Silts
TL;DR: In this paper, the authors used intergranular contact void ratios and confining stress indices to characterize the stress-strain response of gap-graded granular mixes and found that the collapse potential of silty sand increases with an increase in fines content (FC).
References
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Book
Soil mechanics in engineering practice
Karl Terzaghi,Ralph B. Peck +1 more
TL;DR: In this article, the authors present a survey of the properties of soils and their properties in terms of Hydraulics of Soils, Hydraulic and Mechanical Properties of Soil Exploration Hydraulic, Mechanical, and Hydraulic properties of soil.
Journal ArticleDOI
A state parameter for sands
K. Been,Michael Jefferies +1 more
TL;DR: In this paper, the authors present an appropriate physical parameter, termed the state parameter, that combines the influence of void ratio and stress level with reference to an ultimate (steady) state to describe sand behaviour.
Journal ArticleDOI
Evaluation of Liquefaction Potential Using Field Performance Data
TL;DR: In this article, a simplified procedure for evaluating the liquefaction potential of sand deposits using data obtained from standard penetration tests is reviewed, and the results of this study are then extended to other magnitude earthquakes using a combination of laboratory and field data.
Journal ArticleDOI
Undrained Deformation and Liquefaction of Sand under Cyclic Stresses
TL;DR: In this paper, five fundamental postulates are introduced as the bases on which a model of undrained deformation of sand under cyclic loading is to be established, and the procedures for assessing pore pressures, shear strains and consequent occurrence of liquefaction during cyclical loading are illustrated on the diagrams based on the above postulates as well as actual data obtained in the static triaxial tests.