Mechanism Analysis of Strengthening the Coral Reef Sand Foundation by Dynamic Compaction Method Based on Discrete Element Theory
The dynamic compaction method for reinforcing foundation has the advantages of significant ef-fectiveness,saving in materials and short construction period,which is suitable for reinforcing coral reef sand foundation.To conduct the mechanism of strengthening coral reef sand foundation by dynamic com-paction method,a numerical model was established based on discrete element method which could simulate both the shape of coral reef sand and the characteristics of soil porosity changes during the dynamic compac-tion process.The numerical model reliability was verified by field test results,and finally the coral reef sand particle crushing process,force chain development and foundation settlement under different tamping energy were analyzed,so as to clarify the internal mechanism of foundation reinforcement.The research re-sults showed that the foundation settlement of adopted discrete numerical model showed a good alignment with that of field results,proving that the model had low error and high reliability;under the action of dy-namic compaction method,the pores of coral reef particles decreased,the particle fragmentation zone grad-ually developed to both ends of the ramming pit,and the force chain was concentrated and radially distribu-ted towards the center of the ramming pit;the greater the tamping energy,the greater the surface and foun-dation settlement within a certain depth range,and the particle fragmentation zone and force chain devel-oped in both depth and breadth.
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