Undrained monotonic and cyclic simple shear behaviour of carbonate sand

Porcino, D.; Caridi, Graziella; Ghionna, Vito Nicola

doi:10.1680/geot.2007.00036

Cited by 90 publications

(15 citation statements)

References 13 publications

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“…The tested material was Quiou sand (QS) (Golightly 1989, Bellotti et al 1991, Porcino et al 2005, 2008 which consists of a greyish-white sub-angular to sub-rounded uncemented calcitic carbonate coral sand (Golightly 1989). The specific gravity of QS is G s = 2.702, and the maximum and minimum index void ratios determined using the Kolbuszewski (1948) method were e max = 1.169 and e min = 0.763.…”

Section: Introductionmentioning

confidence: 99%

Influence of cyclic pre-shearing on undrained behaviour of carbonate sand in simple shear tests

Porcino

Marcianò

Ghionna

2009

Geomechanics and Geoengineering

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The paper will offer insights regarding the effects of cyclic prestrain history on the undrained behaviour of an uncemented carbonate sand (Quiou sand) through a modified NGI simple shear (SS) apparatus. Tests were carried out on specimens reconstituted at two void ratios (loose and dense) by using the water sedimentation method. The influence of cyclic undrained pre-shearing was investigated by applying both small and large limiting shear strains; after reconsolidation, the specimens were again subjected to the same cyclic phase as before, until the sample liquefied. The pattern of postcyclic behaviour of the tested sand showed the relevant role assumed by the phase transformation line obtained from monotonic tests on virgin specimens. For both loose and dense specimens a threshold value of cyclically induced pre-shear strain was found at which the positive effect of previous cyclic loading history on liquefaction resistance disappears or starts to reverse. A normalising criterion, capable of providing a unified description of the pore-pressure build-up curves for different pre-shearing histories, was verified. Finally, a direct comparison between the tested sand and a silica sand with similar grain size features was also presented in order to ascertain the influence of particle crushing on the post-cyclic liquefaction behaviour.

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Section: Introductionmentioning

confidence: 99%

Influence of cyclic pre-shearing on undrained behaviour of carbonate sand in simple shear tests

Porcino

Marcianò

Ghionna

2009

Geomechanics and Geoengineering

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“…Nowadays, numerous scholars have performed a lot of research on enhancing the mechanical properties of calcareous sand. One of the methods is to use microbially induced calcite precipitation (MICP) technology for foundation treatment [1,3,[9][10][11][12][13][14][15][16][17]. Ivanov [18] and Van Paassen [19] have proved that MICP could effectively improve the strength of soil.…”

Section: Introductionmentioning

confidence: 99%

Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Yang

Liu

2019

JMSE

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In the South China Sea, calcareous sand, as a natural foundation, has the features of low mechanical properties, including its compressive strength. With the development of South China Sea islands, the problems of calcareous sand foundation are encountered in the process. However, the experience of traditional pile foundation engineering could not be applied to calcareous sand. In this study, different proportions of curing agents were added to calcareous sand to improve the compressive strength. The quantitative analysis of the relationship between the unconfined compressive strength and microstructure of solidified calcareous sand is discussed. The unconfined compressive strength was gauged from unconfined compressive strength tests. Microscopic images, acquired using a scanning electron microscope (SEM), were processed using the Image-Pro Plus (IPP) image processing software. The microscopic parameters, obtained using IPP, include the average equivalent particle size (Dp), the average equivalent aperture size (Db), and the plane pore ratio (e). This research demonstrates that the curing agent could improve the compressive strength, which has a relation with the three microstructure parameters. The curing agent, through hydration reaction, generates hydration products, i.e., calcium silicate hydrate, calcium hydroxide, and calcite crystals. They adhere to the surface of the particles or fill the space between the particles, which helps increase the compressive strength. In addition, there is a good linear relationship between the macroscopic mechanics and the microscopic parameters. Using the mathematical relation between the macroscopic and microscopic parameters, the correlation can be built for macro-microscopic research.

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“…Most tests at present mainly consider the state where the initial shear stress does not exist; that is, starting the test based on the equal 3D consolidation pressure. e initial shear stress is an important factor affecting the dynamic properties of saturated sand, and numerous researchers are beginning to focus on studying the effect of initial shear stress [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial Shear Stress and Vibration Frequency on the Dynamic Pore-Water Pressure of Saturated Sands

Zhang

Cao²,

Huang

2018

Advances in Civil Engineering

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The cyclic triaxial system is used to investigate the effects of confining pressure, initial shear stress, vibration frequency, and dynamic stress on the pore-water pressure characteristics of saturated sand in the Wenchuan area. Results show that the initial shear stress has a remarkable effect on the development of the dynamic pore-water pressure of saturated sand. The greater the initial shear stress, the slower the development curve of the pore-water pressure of saturated sand and the higher the number of cycles required to reach the same pore-water pressure. The larger the initial shear stress, the smaller the dynamic pore-water pressure when the sample is destroyed. Moreover, the maximum pore-water pressure ratio decreases linearly with the increase of the consolidation ratio. The normalised relationship curve between the dynamic pore-water pressure and failure time of vibration is consistent with the development law of the power function. The power function model parameters are affected by the initial shear stress and confining pressure. At the time of isotropic consolidation, the accumulation law of pore-water pressure presents a growth pattern of “fast-stable-intensified.” A modified pore-water pressure model considering vibration frequency is proposed on the basis of the Seed pore-water pressure model, and the model parameters are linear with the vibration frequency. When the vibration frequency remains unchanged, the parameter does not change with the confining pressure and dynamic stress. This modified model can predict the change rule of pore-water pressure with the frequency under isotropic consolidation.

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Undrained monotonic and cyclic simple shear behaviour of carbonate sand

Cited by 90 publications

References 13 publications

Influence of cyclic pre-shearing on undrained behaviour of carbonate sand in simple shear tests

Influence of cyclic pre-shearing on undrained behaviour of carbonate sand in simple shear tests

Research on Unconstrained Compressive Strength and Microstructure of Calcareous Sand with Curing Agent

Effects of Initial Shear Stress and Vibration Frequency on the Dynamic Pore-Water Pressure of Saturated Sands

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