Effect of Gradation on the Compactability of Coarse-Grained Soils

Wu, Erlu; Zhu, Jun-Gao; Guo, Weijian; Zhang, Zongliang

doi:10.1007/s12205-020-1936-7

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…The engineering properties of coarse-grained fillers are affected by rock block content significantly [3]. The rock block content can be determined by the gradation curve with a specified threshold of rock blocks and fine-grained fillers [12,14]. Therefore, the influence of rock block content on compaction characteristics of coarse-grained fillers can come down to their gradations in the final.…”

Section: Testing Scheme and Proceduresmentioning

confidence: 99%

“…Ding et al [11] pointed out that there was an intrinsic dependence of grain sizes on the maximum dry density for gravelly fillers. Wu et al [12] studied the effect of gradation on the compatibility of coarse-grained fillers. Several scholars also have discussed the feasibility of empirical prediction methods to indirectly determine the maximum dry density of coarse fillers, such as the elastic wave method and SRM-G prediction model [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Rock Block Content on Compaction Characteristics of Graded Coarse-Grained Fillers

et al. 2021

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The bearing capacity, stability, and durability of subgrade are affected by the compaction quality of fillers to a large extent. In this study, samples of graded coarse-grained fillers with different rock block contents were designed and prepared with the aid of an improved continuous gradation equation for coarse-grained soils. Then standard compaction tests of these samples with different water content conditions were conducted to understand the influence of rock block content on the compaction characteristics of graded coarse-grained fillers. Results show that the compaction curve peaks of graded coarse-grained fillers always increase with the rock block content. The maximum dry density of graded coarse-grained fillers increases linearly with the rock block content in approximation, while the optimal water content is the opposite. The optimal water content of graded coarse-grained fillers decreases in nonlinearity with characteristics of rapidly first and then slowly. Two empirical formulas about the rock block content were summarized for predicting the maximum dry density and optimal water content of graded coarse-grained fillers. The results of this study can provide a reference for the engineering application of graded coarse-grained fillers.

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Section: Testing Scheme and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Rock Block Content on Compaction Characteristics of Graded Coarse-Grained Fillers

et al. 2021

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“…Block stone, crushed stone, stone slag, sandy soil, stone chips, backfill, and mixed soil containing a large number of coarse particles in cohesive soil are materials often used in engineering [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. At present, with the continuous increase in the height of earth rock dams, the particle size of rockfill materials is also larger, some of which reach 600~800 mm, and some even reach 1000 mm [ 10 , 11 ]. Under the indoor triaxial test condition [ 2 ], the maximum particle size of the sample shall not exceed 1/5 of the sample diameter D. Limited by the size of the test instrument.…”

Section: Introductionmentioning

confidence: 99%

“…The rockfill materials that exceed the maximum allowable particle size for the test must be reduced. There are great differences in the macro mechanical properties of rockfill materials replaced by scales of different sizes [ 3 , 10 , 11 , 12 , 13 ], which is the scale effect. In recent years, the research on scaling effect mainly focuses on two aspects [ 2 ]: on the one hand, it is to increase the sample size and restore the in situ size of rockfill as much as possible to reduce the impact of scaling [ 1 , 12 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Scale Effect on Strength and Deformation Characteristics of Rockfill Materials

Han

Shi

et al. 2022

Materials

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The hybrid method was adopted to model the original gradation of rockfill materials. According to the specification requirements, three simulated gradations of rockfill materials have been obtained. By the same token, the corresponding maximum particle sizes are 20 mm, 40 mm and 60 mm, respectively. With samples prepared under the same criterion of relative density, the scale effect on strength and deformation characteristics of the rockfill materials were studied by large-scale and consolidated-drained triaxial compression tests. The results show that when the confining pressure is higher, the peak deviator stress decreases with the increase of the maximum particle size. With the increase of the maximum particle size, the cohesion of rockfill materials gradually increases and the internal friction angle gradually decreases. Under the condition of the same maximum particle size, with the increase of confining pressure, the volume strain at the phase transition increases gradually, while the stress ratio at the phase transition decreases. Under the same confining pressure, the larger the particle size is, the smaller the volume strain becomes and the lower the stress ratio at the phase transition is. Therefore, the research results can provide a theoretical basis for establishing the constitutive model of rockfill materials considering the scale effect.

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“…The previous research compared physical tests, and numerical simulation indicated that the gra-dation characteristics of CGS filler, such as controlling the optimal coarse-grained content, significantly influence the compaction behaviors [2,3]. Therefore, several related research findings, including the gradation equation, were put forward to quantitatively express the influence of gradation on the mechanical behaviors of CGS fillers [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of Vertical Dynamic Stress Attenuation for Compacted Coarse-Grained Soils

SUN¹,

Fang

SHU

et al. 2022

Journal of Sustainable Construction Materials and Technologies

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Coarse-grained soil (CGS), as a filler with the characteristics of high bearing capacity but difficult compaction for embankment construction, requires an appropriate thickness of a single compaction layer according to the influence depth of vertical dynamic stress. In this paper, a numerical analysis using PFC2D was conducted by following a scale model test with different particle gradations of compacted CGS fillers by adopting a modified PFWD. The results show that the influence depth is about 50 cm under the impact maximum stress 0.066 MPa if defined the depth as the maximum stress attenuation to 20%. The compacted CGS filler with the dense particle gradation and high strength has a rapid attenuation on vertical dynamic stress. Meanwhile, with the increase of stone content (P5, particle size ≥5 mm), the vertical dynamic stress of compacted CGS is attenuated exponentially. The maximum particle size also affects the attenuation of vertical dynamic stress, which needs further research. The findings support the development of non-destructive devices to rapidly inspect the compactness of subgrade construction.

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Effect of Gradation on the Compactability of Coarse-Grained Soils

Cited by 20 publications

References 16 publications

Influence of Rock Block Content on Compaction Characteristics of Graded Coarse-Grained Fillers

Influence of Rock Block Content on Compaction Characteristics of Graded Coarse-Grained Fillers

Influence of Scale Effect on Strength and Deformation Characteristics of Rockfill Materials

An Evaluation of Vertical Dynamic Stress Attenuation for Compacted Coarse-Grained Soils

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