Simulation of dynamic compaction and analysis of its efficiency with the material point method

Dynamic compaction of rockfill is simulated by the material point method, and the compaction mechanism as well as the factors that influence the compaction efficiency are investigated. The rigid-flexible contact algorithm is further developed to simulate the dynamic contact of the hammer with soil....

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Bibliographic Details
Published in:Computers and geotechnics 2019-12, Vol.116, p.103218, Article 103218
Main Authors: Zhang, Ruiyu, Sun, Yujin, Song, Erxiang
Format: Article
Language:English
Subjects:
Airport construction
Airport siting
Airports
Algorithms
Coarse-grained soils
Compaction
Compression
Compression tests
Computer simulation
Constitutive models
Construction sites
Deformation
Density-dependent soil constitutive model
Dynamic compaction
Effective energy ratio
Effective improvement range
Energy
Energy measurement
Material point method
Plastic deformation
Plastic strain energy
Rockfill
Simulation
Soil
Soil analysis
Soil compaction
Soil density
Soil dynamics
Soil stresses
Tamping
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Summary:Dynamic compaction of rockfill is simulated by the material point method, and the compaction mechanism as well as the factors that influence the compaction efficiency are investigated. The rigid-flexible contact algorithm is further developed to simulate the dynamic contact of the hammer with soil. A density-dependent soil constitutive model for coarse grained soil is proposed, which is applicable for the analysis of soil subjected to high stress, as that under dynamic compaction. The simulation results are in good agreement with the experimental data from the construction site of the Chinese Chengde Airport. A new concept, the “effective energy ratio”, defined as the ratio of the plastic strain energy absorbed by volumetric compression deformation to the total tamping energy, is introduced to measure the effective proportion of the energy applied, which induces actual compaction of soil, and the influence factors on the effective energy ratio are studied. Especially, a comprehensive comparison is made between a low drop of a heavy hammer and a high drop of a light hammer. Moreover, an approximate formula for the effective improvement range of dynamic compaction is established, and an appropriate tamping point spacing is suggested through simulations of multipoint tamping.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2019.103218