DEM Simulation of Dynamic Compaction with Different Tamping Energy and Calibrated Damping Parameters

Jiang, Mingjing; Wu, Di; Xi, Banglu

doi:10.1007/978-981-10-1926-5_88

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The hammer and container are simulated by the FDM package FLAC3D, and the soils are modeled by 10191 particles with a radius of 10 cm, as shown in Fig. 3 The simulated results show that the stress curve oscillates 2 times before vanishing, which does not mean the rebounding of hammer and can be controlled by adjusting the viscous damping coefficient [19]. Except for the oscillating phenomenon, the numerical results match very well with those of the laboratory tests.…”

Section: Parameter Validation By Dynamic Compaction Testmentioning

confidence: 59%

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

Wang¹,

Jiang²,

Ouyang³

et al. 2019

J. vibroeng.

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To investigate the compaction effect and environmental impact effect of dynamic compaction (DC), a 3D continuous-discrete coupling method was used to simulate the hammer-soil interaction process for the first time. Through the dynamic response analysis of the hammer, it is found that the force of the hammer changes through three stages: the contact force increases rapidly, the contact force decreases rapidly, and the contact force decreases slowly; in addition, the soil particles are compacted under the dynamic load, resulting in oscillating changes in the soil porosity. The granular soil is punched by the hammer to form a truncated punching surface in the bulk below the bottom of the hammer. Ellipsoidal compaction bands are formed inside the punching surface, and shear bands are formed outside the punching surface. The compression and shear zones affect the soil outside the continuous-discrete interface and form a stress concentration zone and a plastic strain zone near the interface, resulting in a sharp attenuation of the acceleration amplitude as the radial distance increases. Through an amplitude and Fourier spectrum analysis, it is found that the radial vibration caused by the DC is the strongest, while the tangential and vertical vibrations are almost the same. With the increase in the radial distance, the radial vibration attenuation rate is greater than that of the tangential and vertical vibrations, and their PGAs tend to be the same away from the impact point. These research results are helpful for evaluating the influence of the DC and the installation process on the reinforcement effect of the soft ground and for improving the accurate design and control level of soft ground strengthened by DC.

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Section: Parameter Validation By Dynamic Compaction Testmentioning

confidence: 59%

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

Wang¹,

Jiang²,

Ouyang³

et al. 2019

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…Dynamic compaction (DC) refers to the ground improvement method in which a heavy weight is dropped onto the ground surface from a great height to increase the density of the underlying soils. e DC method has been found to be useful in improving the mechanical behavior of underlying soil layers, especially loose granular materials [1][2][3][4]. Recently, the DC method has been widely used in many engineering fields, such as airports, seaports, dams, and railways.…”

Section: Introductionmentioning

confidence: 99%

“…Ma et al [18] pointed out that the improvement and the maximum influence depth of DC can be easily evaluated via the porosity changes of the gravel soil obtained by the particle flow discrete (PFC) element method. Jiang et al [3] conducted a series of DC tests with PFC 3D to evaluate the compacting effects via the porosity and the ground settlement.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Dynamic Compaction Process considering the Phenomenon of Particle Breakage

Ma³

et al. 2018

Advances in Civil Engineering

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Dynamic compaction (DC) is commonly used to strengthen the coarse grained soil foundation, where particle breakage of coarse soils is unavoidable under high-energy impacts. In this paper, a novel method of modeling DC progress was developed, which can realize particle breakage by impact stress. A particle failure criterion of critical stress is first employed. The “population balance” between particles before and after crushing is guaranteed by the overlapping method. The performance of the DC model is successfully validated against literature data. A series of DC tests were then carried out. The effect of particle breakage on key parameters of DC including crater depth and impact stress was discussed. Besides, it is observed that the relationship between breakage amount and tamping times can be expressed by a logarithmic curve. The present method will contribute to a better understanding of DC and benefit further research on the macro-micro mechanism of DC.

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Densification mechanism of granular soil under dynamic compaction of proceeding impacts

et al. 2021

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DEM Simulation of Dynamic Compaction with Different Tamping Energy and Calibrated Damping Parameters

Cited by 5 publications

References 6 publications

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

3D continuum-discrete coupling modeling of soil-hammer interaction under dynamic compaction

Numerical Study of the Dynamic Compaction Process considering the Phenomenon of Particle Breakage

Densification mechanism of granular soil under dynamic compaction of proceeding impacts

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