Abstract
Dynamic compaction machine (DCM) is a widely adopted ground reinforcement technology. However, dynamic compaction energy has a very significant impact on the surrounding environment. At present, the research on the impact of dynamic compaction mainly focuses on the effect of the tamping behavior of a single compactor in the working state, whereas the research on the impact of multiple compactors working jointly is rare. To study the impact of the dynamic compaction energy of multiple compactors working jointly on the surrounding environment, the dynamic response model for multiple compactors working in the same field was established based on the explicit dynamic analysis module in ABAQUS. The validity of the model was verified by comparison with the measured data. Based on this, the impact of the dynamic compaction energy of multiple compactors with different working conditions in terms of the arrangement, spacing, and working time interval was analyzed. The results showed that the arrangement and spacing of the compactors had a remarkable influence on the distribution of the dynamic compaction energy in the surrounding environment. Under the condition of multiple compactors working with a time interval of less than 10 s, the impact of the superimposed dynamic compaction energy due to the interaction of multiple compactors had to be considered.
Highlights
E above studies of Dynamic compaction machine (DCM) energy were mainly targeted at single compactors
E above studies of DCM energy were mainly targeted at single compactors
Rewritten the multiple impact sources time function m as a pulse sequence related to single hammer vibration: m ms · mR, n mR aiδ t − ti, i 1, 2, . . . , n, i 1 where mR is the pulse sequence function, ai stands for the vibration ratio coefficient of the pulse i, δ is the Dirac pulse function, t is the impact time interval, and n is the number of pulses (DCM hammer)
Summary
In the analysis of dynamic compaction, factors such as the dynamic impact of DCM and the hammer-soil interaction must be comprehensively considered in the soil constitutive model. Erefore, the center area of the site calculation model could be simulated by the finite element method, considering the soil heterogeneity, nonlinearity, and stratigraphic interface. Erefore, in the model, the size of the element in the tamping loading area in contact with the hammer and the ground soil was set to 0.5 m, and the size of the impacted area was set to 0.8 m. Allowable peak vibration velocity of the peak vibration top floor (mm/s) velocity
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