Effect of particle shape on the liquefaction resistance of calcareous sands

Rui, Shengjie; Guo, Zhen; Si, Tongling; Li, Yujie

doi:10.1016/j.soildyn.2020.106302

Cited by 83 publications

(17 citation statements)

References 29 publications

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“…As is mentioned above, relative density is an important parameter of sand, which is analyzed by Equation (9). Nevertheless, the limit void ratio is difficult to measure directly and needs to be computed using Equations ( 10) and (11). Namely, relative density can be obtained by measuring the maximum and minimum dry densities:…”

Section: The Minimum and Maximum Dry Density Testmentioning

confidence: 99%

“…With the implementation of the Belt and Road Initiative, calcareous sands have been a topic of interest among geotechnical researchers recently. However, they tend to concern particle shape and breakage [11][12][13], biocementation [14][15][16], and bearing capacity of pile foundations [17][18][19]. There are few papers on maximum and minimum void ratios and relative density of calcareous sands.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation into Limit Void Ratio Characteristics of Calcareous Sands considering Various Factors

Lei

Guo

et al. 2021

Geofluids

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Relative density is an important index affecting the mechanical behaviors of calcareous sands. The dense sands present softening strength, whereas the loose sands exhibit hardening strength. Furthermore, the relative density is determined based on the maximum and minimum void ratios obtained by using the maximum and minimum dry density test. In this study, a series of tests were carried out on various mixed graded sands to explore their material properties and the relationship between the limit void ratio, considering the effects of test methods, equipment, and fine content. It is shown that a more accurate maximum void ratio can be attained by using the 1000 mL measuring cylinder with low rotation speed. In addition, in order to avoid particle breakage of calcareous sands, it is suggested that the minimum void ratio should be obtained with the 1000 mL compaction cylinder combining vibration with hit. The results also show that a linear relationship exists among the limit void ratio of various mixed graded sands. Besides, the void ratio is significantly affected by the fine content. 40% is the critical fine content corresponding to the lowest value of the limit void ratio.

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Section: The Minimum and Maximum Dry Density Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Limit Void Ratio Characteristics of Calcareous Sands considering Various Factors

Lei

Guo

et al. 2021

Geofluids

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“…The characteristics of calcareous sand are high crushability, irregular particle shape, complex microstructure, and high intraparticle void [7,8]. Therefore, the mechanical behaviors are quite different from those of silica sand [9][10][11]. Over the past few years, calcareous sand has been used as a kind of filling material in geotechnical engineering, and the engineering challenges (e.g., embankment subsidence, retaining wall stability, and ground improvement) are becoming more and more complex.…”

Section: Introductionmentioning

confidence: 99%

Undrained Cyclic Response and Resistance of Saturated Calcareous Sand considering Initial Static Shear Effect

Guo

Zhou

et al. 2021

Geofluids

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Sand elements in the natural or manmade field have often undergone initial static shear stresses before suffering cyclic loading. To explore the effect of static shear stress, a series of undrained cyclic triaxial tests were performed on dense and loose calcareous sand under different initial and cyclic shear stresses. The triaxial test results are used to describe the effect of static shear stress on the cyclic response of the calcareous sand with different relative density. Cyclic mobility, flow deformation, and residual deformation accumulation are the three main failure modes under varying static and cyclic shear stress levels. The cyclic resistance of dense sand is greater than that of loose sand, but the initial static stress has different effects on the cyclic resistance of the two kinds of sand. The dense sand owns a higher cyclic resistance with SSR increasing, while for the loose sand, 0.12 is the critical SSR corresponding to the lowest value of the cyclic resistance. The dense sand has more fast accumulation of dissipated energy, compared with loose sand. Additionally, an exponential relationship is established between static shear stress, relative density, and normalized energy density.

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“…There are many biological impurities and inorganic salt deposits in the sand layer in this area, and the soil properties may differ from the corresponding soil samples to the previous theoretical analysis. However, the research on dynamic shear modulus of marine soil mainly focused on shallow soft clay [19,20]. Thus, the dynamic properties of these typical soil in this location are required to ensure structural safety.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

Liang

Zhang

Wang

et al. 2021

JMSE

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Offshore wind power, as an efficient renewable energy source, is being vigorously developed nowadays. However, the liquefaction of marine sand due to earthquakes brings potential safety hazards to the wind turbine structures. In this study, a series of resonant column and undrained cyclic triaxial tests were carried out to investigate the stiffness degradation and liquefaction characteristics of marine sand in the offshore wind farm at the East Nan-ao area in Guangdong Province (China). Results show that the confining pressure increases the shear modulus of sand and restrains the nonlinearity of modulus. The liquefaction resistance of soils significantly increases with the increase of relative density. The effect of particle size on the liquefaction resistance is related to the cyclic shear stress ratio. The additional pressure induced by the presence of the wind turbine structure enlarges the energy required for shallow soil liquefaction. Besides, a model for predicting shear modulus and another modified model based on Seed’s pore pressure development model have been established, which can efficiently fit the dynamic shear modulus and the generation of excess pore water pressures in the tests, respectively.

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Effect of particle shape on the liquefaction resistance of calcareous sands

Cited by 83 publications

References 29 publications

Experimental Investigation into Limit Void Ratio Characteristics of Calcareous Sands considering Various Factors

Experimental Investigation into Limit Void Ratio Characteristics of Calcareous Sands considering Various Factors

Undrained Cyclic Response and Resistance of Saturated Calcareous Sand considering Initial Static Shear Effect

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

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