Sample preparation method and its effect on static and cyclic deformation — strength properties of sand

Miura, S.; Toki, Shosuke

doi:10.1016/0148-9062(83)91658-3

Cited by 38 publications

(47 citation statements)

References 0 publications

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“…Observe that the range of the (black) lines for TC falls generally above the range of (gray) lines for TE, but the two ranges practically border one another, showing that the effect of sample preparation on the sand response may be as important as the effect of loading direction and manner. This figure also shows that the range of the (gray) lines for TE is larger than the range of (black) lines for TC, denoting that the response in TE seems to be more affected by the sample preparation method than the response in TC, in accordance to observations by Miura and Toki (1982). Finally, observe the quantitative verification of the observation that the 3 dry methods give distinctly more contractive and soft response than the wet (tamping) method, for both TC and TE, since the lines for WT lie far above the respective lines for the dry methods.…”

Section: Sample Preparation Methods and Stress Strain Responsesupporting

confidence: 83%

“…For example, the differences in response between TC and TE may be counterbalanced by different preparation methods (observe similarities between TC after DR and TE after WT). Anyway, sand response in TE seems to be more affected by the sample preparation method than the response in TC, in accordance to observations by Miura and Toki (1982). d) The sample preparation method affects the quasisteady state of the sample, but its effect on the critical state is in debate in the literature.…”

Section: Constants Ea and Hasupporting

confidence: 82%

“…If compaction of the sample is performed by use of a thin rod, then the gravitational (transverse isotropic) fabric of the soil is presumably destroyed leading to an isotropic fabric (Oda, 1981). On the other hand, tapping on the mold is thought to destroy less the gravitational fabric leading to intermediate levels of anisotropy (Miura and Toki, 1982).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasticity Modeling of the Effect of Sample Preparation Method on Sand Response

Papadimitriou¹,

Dafalias²,

Yoshimine

2005

SOILS AND FOUNDATIONS

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Experimental evidence shows that different preparation methods produce sand samples with distinctly different stress-strain response. This paper explores and draws conclusions from the measured differences on the monotonic undrained triaxial response of Toyoura sand, prepared by different methods at the same values of void ratio and initial effective stresses. This is achieved by comparing data and simulations performed with a recently developed plasticity constitutive model, which accounts for the effect of inherent fabric anisotropy on the mechanical response. The inherent fabric anisotropy is represented by a second order symmetric fabric tensor, and its effect on the response at different loading directions is expressed by an appropriate dependence of certain constitutive ingredients on a joint isotropic invariant of the loading direction and the fabric tensor. Use of this constitutive scheme to simulate the aforementioned data on Toyoura sand exploits the fact that the preparation method affects both the dilatancy and the hardening response in a systematic manner. Under the premise that these effects are due to the differentinherent fabric created by the preparation method, it follows that the foregoing simulations do not require changes in constitutive equations or entirely different sets of model constants. On the contrary, only model constants related to this inherent fabric anisotropy scheme need readjustment, providing insight to how the sample preparation method affects the response and what can be done to model it.

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Section: Sample Preparation Methods and Stress Strain Responsesupporting

confidence: 83%

Section: Constants Ea and Hasupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plasticity Modeling of the Effect of Sample Preparation Method on Sand Response

Papadimitriou¹,

Dafalias²,

Yoshimine

2005

SOILS AND FOUNDATIONS

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“…The specimens were constructed inside the impregnation chamber (Figure lb) using the dry pluviation technique [Miura and Toki, 1982]. This technique involves the uniform raining of sand from a constant height (5 cm) above the center of the specimen through a funnel with a predetermined opening size (4 mm).…”

Section: Image Analysis Of Soil Specimensmentioning

confidence: 99%

Simulation of fluid flow and permeability in cohesionless soils

Masad¹,

Muhunthan²,

Martys³

2000

Water Resources Research

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Abstract. This paper reports on a new laboratory methodology for the determination of the structure of pores, a method for the analysis of the data to obtain the statistics of the pore structure distribution, simulation of porous media with statistics consistent with those in the specimens, numerical simulation of fluid flow in images of porous media, and the determination of permeabilities from the numerical experiments and comparison with the results of laboratory experiments. The computed flow fields show that flow in porous media is restricted to preferential paths depending on the size and connectivity of pores. Whole areas of the pore structure are relatively isolated from the flow because of bottlenecks. The distribution of the isolated regions depends on the angularity of the grains and the porosity of the medium. The more angular the grains are the greater is the possibility for the presence of isolated regions. For grains with the same angularity a decrease in the porosity leads to concentration of flow along preferential flow paths. The permeability tensor coefficients are derived from the flow fields of the two-dimensional images as well as the three-dimensional computer-simulated images of soil microstructure. The numerical values of permeability and permeability anisotropy ratio compare well with laboratory experimental data.

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“…Depending on the mode of deposition and the grain morphology, different topological configurations in terms of grain rearrangements and void geometries may emerge, and this has a fundamental role in determining the properties of the material being measured (Butterfield & Andrawes, 1970;Miura & Toki, 1982;Rad & Tumay, 1987;Fonseca et al, 2013). While the uniformity of the sample is a matter of concern, there is limited control on the local void ratio variations and the contact topologies obtained using either gravity-induced deposition or mechanical-energy-based methods.…”

Section: Introductionmentioning

confidence: 99%