Experimental study on the phase transformation point of crushable and noncrushable soils

Shahnazari, Habib; Rezvani, Reza; Tutunchian, Mohammad Amin

doi:10.1080/1064119x.2015.1126773

Cited by 36 publications

(9 citation statements)

References 27 publications

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“…Xiao et al (2017) attributed this behavior to the change of coordination number with the initial density. Similar findings, about the effect of relative density on the particle breakage, were also found by Laufer (2015), Ueng and Chen (2000), and Shahnazari et al (2015).…”

Section: Effect Of Relative Densitysupporting

confidence: 87%

Discussion of “Particle breakage in granular materials — a conceptual framework”

Dallo

Liu

2018

Can. Geotech. J.

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The authors have presented a good paper (Konrad and Salami 2018; hereafter referred to as the paper under discussion) dealing with a particle breakage model. Two of the model parameters are the slope of the breakage development segment in the model and the reference slope of the grain-size distribution (GSD) curve in log-log space, ␣ and v ref , respectively. The authors suggest that these parameters can be computed as function of t , the tensile strength of a particle of size d 50 (see Figs. 8a and 8b in the paper under discussion; note that all references to Fig. 8 herein refer to this figure in the paper under discussion). The authors verified their model with some experimental data and found a good agreement between the actual and predicted values. We believe that the model can be enhanced and be more reliable if some factors are also taken in consideration, namely the shape of the GSD curve and the soil density.

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Section: Effect Of Relative Densitysupporting

confidence: 87%

Discussion of “Particle breakage in granular materials — a conceptual framework”

Dallo

Liu

2018

Can. Geotech. J.

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“…For calcareous sand, the particle breakage has a significant influence on the volumetric behaviour (Bandini & Coop, 2011;Shahnazari et al, 2014;Shahnazari et al, 2015). It seems that both a higher effective confining pressure and a larger particle size can lead to a larger extent of particle breakage, which reduces the volumetric dilatancy Shahnazari et al, 2015). It can be concluded that the volumetric behaviour of calcareous sand sample is the result of synergy of particle breakage and dilatancy .…”

Section: Effect Of Particle Size On Strain Softening and Dilatancymentioning

confidence: 99%

“…It is found that the empirical dilatancy index for different particle sizes increases with the increasing effective confining pressure, indicating that the volumetric dilatancy behaviour is suppressed by the increasing effective confining pressures. For calcareous sand, the particle breakage has a significant influence on the volumetric behaviour (Bandini & Coop, 2011;Shahnazari et al, 2014;Shahnazari et al, 2015). It seems that both a higher effective confining pressure and a larger particle size can lead to a larger extent of particle breakage, which reduces the volumetric dilatancy Shahnazari et al, 2015).…”

Section: Effect Of Particle Size On Strain Softening and Dilatancymentioning

confidence: 99%

Experimental study on particle size effect on mechanical behaviour of dense calcareous sand

Kuang¹,

Long²,

Wang³

et al. 2020

S&R

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To investigate the effect of particle size on mechanical properties of calcareous sand, a series of consolidated drained triaxial tests were performed on calcareous sand with different particle sizes. At a low effective confining pressure of 50 kPa, the shear peak strength increases with the increasing particle size. However, under a relatively large effective confining pressure (³ 200 kPa), the shear peak strength decreases with the increasing particle size. Moreover, the apparent cohesion increases, and the corresponding friction angle decreases with the increase of particle size. The softening and dilatancy coefficient were proposed to evaluate the softening and dilatancy behaviour quantitatively. Calcareous sands with larger particle size show the greater strain hardening and volumetric contraction behaviour, which is more susceptible to the effective confining pressure.

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“…Therefore, the acoustic emission(AE) technique was used to detect the AE signals during the crush of calcareous sands [1]. Besides, strength characteristics obtained by tri-axial tests were compared between non-crushable silica soil and crushable calcareous soil [2]. Furthermore, Dynamic behaviors of calcareous sands were also obtained by dynamic tri-axial tests [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wood Fiber on the Strength of Calcareous Sand Rapidly Seeped by Colloidal Silica

et al. 2019

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Silica nano-particles are suspended in the colloidal silica and can be induced to gradually gel after the PH value changes. Thus colloidal silica can be utilized to rapidly seep through loose calcareous sand, and the silicon gel is gradually formed to bond sand particles. However, based on observation by scanning electron microscope(SEM), there are a lot of microcracks in the silica gel, which reduces the strength of the sand-gel composite. Therefore, in order to suppress crack growth, wood fibers are dispersed in the colloidal silica which still can seep through calcareous sand. 18 silicon-gel stabilized sand samples were prepared for tri-axial tests, where the concentration of colloidal silica is 20%, and wood fiber concentrations are 0%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, respectively. The results show that:(1) there exists an optimum ratio of wood fiber to colloidal silica, that is, as the concentration of wood fiber increases, the strength represented by the peak value of deviator stress rises first and then falls; (2) there are opposite trends between the two strength parameters, internal friction angle and cohesion, that is, when the wood fiber concentration is 0.04%, the cohesion reaches the maximum value and the internal friction angle reaches the minimum value; (3) The photos by SEM show that, there are wood fibers on the inner wall of the crack in the silica gel, which may reduce the extent of crack propagation and contribute to the strength of stabilized sand samples.

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Experimental study on the phase transformation point of crushable and noncrushable soils

Cited by 36 publications

References 27 publications

Discussion of “Particle breakage in granular materials — a conceptual framework”

Discussion of “Particle breakage in granular materials — a conceptual framework”

Experimental study on particle size effect on mechanical behaviour of dense calcareous sand

Effect of Wood Fiber on the Strength of Calcareous Sand Rapidly Seeped by Colloidal Silica

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