Discrete Simulation of Vibratory Roller Compaction of Field Rockfills

Li, Yang; Cheng-xue, She

doi:10.1155/2021/9246947

Cited by 2 publications

(2 citation statements)

References 27 publications

(49 reference statements)

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“…(a) Direct and continuous contact of the vibratory roller with the soil; (b) No jumps of the vibratory roller with the soil [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Vibratory Compaction Process for Roads

Bratu,

Tonciu,

Nițu

2023

Buildings

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This paper presents results obtained for the vibratory compaction process of road structures, in which the natural soil is used for the foundation infrastructure. The experiments and the optimization of the compaction process were carried out on five road lanes in Transilvania, Romania. A self-propelled single-drum roller compactor, BOMAG BW 213 S-5, was used for the compaction, layer by layer, with six successive passes over each layer. For each layer, the initial degree of compaction was measured, and after the fifth pass, it achieved the value prescribed in the road construction project. After each pass over the same layer, its settlement increased due to the plastic deformation and the soil’s rigidity receiving discrete higher values. This is how five different discrete values for rigidity were obtained. Modeling the compaction process is carried out using the Kelvin–Voigt model, with discrete variable experimental values for soil rigidity and assumed constant viscous damping values. Based on the two-degree-of-freedom linear elastic model, graphs were plotted for vibration amplitude variation and for the force transmitted to the soil when the excitation pulsation varies continuously and the soil rigidity varies discretely. There is a relationship between the initial and final degree of compaction values in the ratio that was proven to be dependent on the ratio of amplitude values corresponding to the final and initial roller passes cycle. The result is a useful relationship for the “in-situ” estimation of the compaction process effect. The novelty of this research is that it demonstrates the change in soil rigidity values after each pass of the vibratory roller and, thus, the increase of its settlement (plastic deformation) and the “slipping” for the amplitude resonance peak by discrete increasing values. Calibration of the resonance vibrations regime in accordance with the degree of compaction determined by geotechnical methods for “in-situ” sample prelevation stands as a fast and efficient method for the evaluation of the final degree of compaction value. This is, implicitly, the method for estimating the number of vibratory roller passes in the road construction project. In conclusion, the novelty of the research consists in the fact that, through using the resonance response of the vibratory roller, a correlation was made with the degree of compaction achieved after each pass.

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“…(a) Direct and continuous contact of the vibratory roller with the soil; (b) No jumps of the vibratory roller with the soil [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Vibratory Compaction Process for Roads

Bratu,

Tonciu,

Nițu

2023

Buildings

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“…To determine the mechanical properties of rockfill materials on site, analog simulation is adopted in laboratory tests to fabricate test specimens that are consistent with the prototype rockfill materials in terms of the internal structure, thereby determining the engineering features of the prototype rockfill materials. Thus far, many scholars at home and abroad have conducted extensive research on factors that influence the size effect of rockfill materials from the aspects of scale method [1][2][3][4], specimen size [5][6][7], particle shapes [8][9][10], and scale ratio [11][12][13]. Their research methods are still dominated by conventional triaxial tests [2][3][4][6][7][8], and laboratory tests are limited by test conditions and costs, as well as difficulties in analyzing changes in the internal mesoscopic mechanisms of rockfill materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rockfill Materials Based on Fractal Theory

Han

et al. 2021

Applied Sciences

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With the use of the particle flow code in two dimensions, a fractal model is established with the number of particles of different particle fractions used as the statistics to study the fractal characteristics of particle size distribution. Numerically simulated specimens obtained by four scale methods are subjected to the relative density test and the biaxial compression test to explore the influences of fractal dimension D on the macroscopic and mesomechanical properties of specimens, as well as to study the relationship between fractal dimension D and different mechanical performance indexes. Results show that the particle size distribution of each of the four groups after scale exhibits fractal characteristics, with the fractal dimension D ranging from 1.27 to 2.03. The number of fine particles in the specimen increases with the fractal dimension D, the particle aggregates become more compact, the macroscopic mechanical properties of the specimens are improved, and a linear relationship exists between the fractal dimension D and different mechanical performance indexes. A large fractal dimension D corresponds to a great mesoparticle coordination number.

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Discrete Simulation of Vibratory Roller Compaction of Field Rockfills

Cited by 2 publications

References 27 publications

Modeling the Vibratory Compaction Process for Roads

Modeling the Vibratory Compaction Process for Roads

Numerical Simulation of Rockfill Materials Based on Fractal Theory

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