Influence of Particle Size Distribution on the Critical State of Rockfill

Gui, Yan; Jiang, Yang; Nimbalkar, Sanjay; Sun, Yifei; Li, Nenghui

doi:10.1155/2019/8963971

Cited by 11 publications

(10 citation statements)

References 29 publications

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“…is is consistent with the research results on critical state line of rockfill material [40][41][42].…”

Section: Experimental Characteristics and 3d Description Of Thesupporting

confidence: 93%

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The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

Zhang

et al. 2020

Advances in Civil Engineering

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To better control the strength and deformation of the roadbed, a constitutive model of rockfill was established based on property-dependent plastic potential theory for geomaterials. The effect of the particle gradation on the anisotropy was described in the model. According to the effect of the particle grading and crushing on the fractal dimension, the fractal theory and fabric tensor were introduced to establish the yield and failure criteria of the rockfill. By combining the property-dependent concepts of the materials and the results of the rockfill strength test, a critical state line considering the microstructure, fractal dimension, particle breakage, and stress state of the rockfill was established. The dilatancy equation was derived based on the novel potential theory and the hardening criterion affected by the critical state was established. A constitutive model of the rockfill in the general stress space was established under the framework of the novel potential theory. The 3D strength and its intensity change in the π plane were simulated through the drainage strength test results, which verified the description of the critical state under various stress paths. By simulating the stress-strain relationship, the validity and rationality of the model were verified.

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“…is is consistent with the research results on critical state line of rockfill material [40][41][42].…”

Section: Experimental Characteristics and 3d Description Of Thesupporting

confidence: 93%

“…Besides, Guo et al found that the particle breakage and particle size distribution had an important effect on the critical state line of the rockfill under stress [38][39][40]. e critical state line of rockfill was very similar to sand.…”

Section: Experimental Characteristics and 3d Description Of Thementioning

confidence: 99%

The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

Zhang

et al. 2020

Advances in Civil Engineering

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“…To overcome this problem, a common practice is to prepare test samples by excluding the oversized particles [10,[27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The method is called the scalping scaling down technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Reliability of Scaling Down Techniques Used in Direct Shear Tests to Determine the Shear Strength of Rockfill and Waste Rocks

Deiminiat

2022

CivilEng

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The determination of shear strength parameters for coarse granular materials such as rockfill and waste rocks is challenging due to their oversized particles and the minimum required ratio of 10 between the specimen width (W) and the maximum particle size (dmax) of tested samples for direct shear tests. To overcome this problem, a common practice is to prepare test samples by excluding the oversized particles. This method is called the scalping scaling down technique. Making further modifications on scalped samples to achieve a specific particle size distribution curve (PSDC) leads to other scaling down techniques. Until now, the parallel scaling down technique has been the most popular and most commonly applied, generally because it produces a PSDC parallel and similar to that of field material. Recently, a critical literature review performed by the authors revealed that the methodology used by previous researchers to validate or invalidate the scaling down techniques in estimating the shear strength of field materials is inappropriate. The validity of scaling down techniques remains unknown. In addition, the minimum required W/dmax ratio of 10, stipulated in ASTM D3080/D3080M-11 for direct shear tests, is not large enough to eliminate the specimen size effect (SSE). The authors’ recent experimental study showed that a minimum W/dmax ratio of 60 is necessary to avoid any SSE in direct shear tests. In this study, a series of direct shear tests were performed on samples with different dmax values, prepared by applying scalping and parallel scaling down techniques. All tested specimens had a W/dmax ratio equal to or larger than 60. The test results of the scaled down samples with dmax values smaller than those of field samples were used to establish a predictive equation between the effective internal friction angle (hereafter named “friction angle”) and dmax, which was then used to predict the friction angles of the field samples. Comparisons between the measured and predicted friction angles of field samples demonstrated that the equations based on scalping scaling down technique correctly predicted the friction angles of field samples, whereas the equations based on parallel scaling down technique failed to correctly predict the friction angles of field samples. The scalping down technique has been validated, whereas the parallel scaling down technique has been invalidated by the experimental results presented in this study.

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“…The relative breakage index decreases with increasing relative density [14]. Extensive research has also been carried out on the impact of granular materials particle gradation [23][24][25]. For example, model parameters varied linearly with the coefficient of uniformity.…”

Section: Introductionmentioning

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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Influence of Particle Size Distribution on the Critical State of Rockfill

Cited by 11 publications

References 29 publications

The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

Experimental Study on the Reliability of Scaling Down Techniques Used in Direct Shear Tests to Determine the Shear Strength of Rockfill and Waste Rocks

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

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