Journal ArticleDOI
Investigation on the mechanical properties of a calcareous sand: the role of the initial fabric
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In this article, the effect of the initial fabric on the coefficient of the lateral earth pressure at rest K-0, the undrained monotonic loading strength and the liquefaction resistance of a calcareous sand from a reclamation land in Persian Gulf was examined.Abstract:
This study examines the effect of the initial fabric on the coefficient of the lateral earth pressure at rest K-0, the undrained monotonic loading strength and the liquefaction resistance of a calcareous sand from a reclamation land in Persian Gulf. K(0)consolidation, undrained compression and extension and cyclic undrained loading triaxial tests are performed on laboratory samples reconstituted by air and water pluviation, dry and moist tamping and dry funnel deposition methods. Test results show that the air pluviation and moist tamping samples own the highest and the lowest K(0)respectively. All the samples at medium loose and medium dense states show strain hardening when subjected to undrained monotonic loading. The air pluviation samples are more contractive than the other samples at the phase transformation points and the moist tamping samples exhibit an over-consolidated behavior. In the cyclic loading tests, the air pluviation and the moist tamping samples exhibit the lowest and the highest liquefaction resistance. It is shown that the evaluation and comparison of the cyclic undrained strength of various sands should take the sample preparation method into consideration scrupulously. The test results also indicate that although the mechanical property of soil sample is influenced by the fabric differences induced by sample preparation method, other factors such as homogeneity and stress history should not be neglected.read more
Citations
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Undrained monotonic response of clean and silty sands
TL;DR: In this article, the authors apply the theoretical equations given by the principle of natural proportionality to the experimental datacontained in this paper and to gain additional experience on the common natural parameters corresponding to the un-drained monotonic response of clean and silty sands.
Journal ArticleDOI
One-dimensional compression feature and particle crushability behavior of dry calcareous sand considering fine-grained soil content and relative compaction
Xue Li,Jiankun Liu +1 more
TL;DR: In this article, a series of compression experiments and laser particle size analyzer tests were conducted under different ending pressures considering relative compaction and fine-grained soil (FS) content to investigate compression behavior and particle breakage of porous and angular calcareous sand.
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Effect of non-plastic fines on the anisotropic small strain stiffness of a calcareous sand
Jinquan Shi,Wim Haegeman,Tao Xu +2 more
TL;DR: In this article, the effect of non-plastic fines on the anisotropic smalls strain stiffness of a calcareous sand by conducting multidirectional bender element tests was investigated.
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Studying the soil column formation in soft soil improved by vacuum preloading via coupled scale‐up CFD‐DEM simulations
TL;DR: In this article , a coupled computational fluid dynamics discrete element method (CFD-DEM) and scale-up strategy were employed to study micro-sized soil particle movements in order to understand the soil column formation mechanism, coupled with a prefabricated vertical drain (PVD) system has been utilized successfully to improve the slurry with extremely high water content.
References
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Journal ArticleDOI
Preparing Test Specimens Using Undercompaction
TL;DR: In this paper, an improved method of preparing reconstituted sand specimens for cyclic triaxial testing has been proposed, which can be used for compacting most types of sands having a wide range in relative densities and permits determination of the optimum cyclic strength of a given sand at a given dry unit weight.
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The general and congruent effects of structure in natural soils and weak rocks
S. Leroueil,P. R. Vaughan +1 more
TL;DR: In this article, the engineering properties of naturally occurring sedimentary and residual deposits which are usually treated in geotechnical engineering as ‘soils’ are reviewed, and it is shown that usually they have characteristics due to bonded structure which are similar to those of porous weak rock.
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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.
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Coefficient of Earth Pressure at Rest
TL;DR: In this paper, the authors revisited the Jaky coefficient of earth pressure at rest, K0, and demonstrated that this coefficient was derived from an analysis of the stress state in a sand prism that yields an unrealistic stress field.
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Factors Affecting Liquefaction and Cyclic Mobility
Gonzalo Castro,Steve J. Poulos +1 more
TL;DR: In this article, the effects of cyclic loading on liquefaction and cyclic mobility of a saturated sand specimen were investigated. But, the authors believe that most observed cyclic movement deformations in dilative clean sands are due to a test error, redistribution of void ratio, which is not representative of in-situ behavior.