Investigation on the undrained shear strength of loose sand with added materials at various mean diameter ratios

Zhu, Zhehao; Zhang, Feng; Dupla, Jean Claude; Canou, Jean; Foerster, Evelyne

doi:10.1016/j.soildyn.2020.106276

Cited by 22 publications

(15 citation statements)

References 39 publications

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“…However, in general, their results are consistent. Both our results and those of Zhu et al 61 show that the presence of added material within the skeleton of homogeneous sand makes it easier to reach the liquefaction state. It can be seen that natural dune sands, consisting of three fractions, are the most sensitive to the applied vibration relative to three other fractions and the rate to reach the liquefaction state is the fastest in relation to three fractions of homogeneous composition.…”

Section: Discussionsupporting

confidence: 84%

“…Since the pore diameter is often estimated to be 20% of the D10 size 60 (the grain size corresponding to 10% sieve passing) and since the soil hydraulic conductivity is frequently considered to be related to the value of D10, the increase in D10 value means the increase in soil hydraulic conductivity and hence the longer time required to reach significant pore pressure in the coarser-grained sand. Comparing the results with those presented by Zhu et al 61 , it looks as if our results contradict their findings: the increase in hydraulic conductivity indicates a less clogged inter-sand void system with the presence of macro pores. Upon shearing, the macro pores are highly to collapse, favoring a contraction.…”

Section: Discussionsupporting

confidence: 53%

“…The content of silt material in the natural dune sand is less than 1% and it was sifted out from the finest fraction (0.3–0.075 mm). The study by Zhu et al 61 presented the results with loose sand (the density index is equal to 0) while our study was performed in relatively dense conditions (the density index is equal to 0.67—see above). The dissimilarity between the two types of experiments shows that their results cannot be directly compared.…”

Section: Discussionmentioning

confidence: 82%

“…The corresponding ratio for three sifted fractions is 1 (as they do not include any additions). The content of added materials in 61 is 5–15% while all added materials are classified as silt or clay. In the presented study the content of the coarsest fraction (0.6–2.36 mm) is 5% while the content of the finest fraction is 50%.…”

Section: Discussionmentioning

confidence: 99%

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Acoustic emission induced by sand liquefaction during vibration loading

Frid

Shulov

2022

Sci Rep

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The article deals with the study of poorly graded sand samples of different grain content subjected to liquefaction. The research results show the V-shaped behavior of the AE parameters that correspond to the three-stage sand behavior: Phase A is associated with microfractures/displacements between sand grains caused by an increase in pore pressure before the liquefaction point. Phase B (the stage of AE silence just before the liquefaction point) reflects the equality between pore pressure and stress in the confining chamber. Phase C (the stage of increase in AE parameters’ values) is explained by intense friction between sand grains during their movement caused by liquefaction. Our results show that the AE behavior before, at, and after the liquefaction point is significantly affected by the sand grain content. The change in the sand composition from the poorly graded dune sand to "extremely poorly graded sand" significantly increases the time for the creation of the liquefaction state while the coarser the sand grains become, the longer duration of vibration loading is required to reach the liquefaction state.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Acoustic emission induced by sand liquefaction during vibration loading

Frid

Shulov

2022

Sci Rep

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“…According to previous research, the confining pressure effect can Gc1Rd=0.9 Gc2Rd=0.9 Gc3Rd=0.9 Gc4Rd=0.9 Gc5Rd=0.9 Gc3Rd=0.6 Gc4Rd=0.7 Gc5Rd=0.8 Breakage raito B g / % ( 3 /Cu/ P a )Rd Median diameter d 50 is an important soil grading curve index. The larger the median diameter, the higher the shear strength and the more obvious is the shear expansion effect [31]. Figure 9 shows the relationship between the particle breakage ratio with d 50 under different confining pressures after monotonic loading.…”

Section: Particle Breakage Under Different Grading Curvementioning

confidence: 99%

Effects of Relative Density and Grading on the Particle Breakage and Fractal Dimension of Granular Materials

et al. 2022

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Particle breakage was reported to have great influence on the mechanical property of granular materials. However, limited studies were conducted to quantify the detailed effects of relative density and initial grading on the particle breakage behaviour of granular materials under different confining pressures. In this study, a series of monotonic drained triaxial tests were performed on isotropically consolidated granular materials with four different initial gradings and relative densities. It is observed that particle breakage increases as the confining pressure or relative density increases, whereas it decreases with the increasing coefficient of uniformity. Due to particle breakage, the grading curves of granular materials after triaxial tests can be simulated by a power-law function with fractal dimension. As the confining pressure increases, the fractal dimension approaches the limit of granular materials, i.e., 2.6. A unique normalized relation between the particle breakage extent and confining pressure by considering relative density and grading index was found.

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