Study on the Reinforcement Mechanism of High-Energy-Level Dynamic Compaction Based on FDM–DEM Coupling

Yiwei Sun, Kan Huang (), Xiangsheng Chen (), Dongmei Zhang, Xiaoming Lou, Zhongkai Huang, Kaihang Han and Qijiang Wu
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Yiwei Sun: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Kan Huang: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Xiangsheng Chen: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Dongmei Zhang: Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Xiaoming Lou: Shanghai Geoharbour Construction Group Co., Ltd., Shanghai 200434, China
Zhongkai Huang: Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Kaihang Han: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Qijiang Wu: School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China

Mathematics, 2023, vol. 11, issue 13, 1-19

Abstract: The high-energy-level dynamic compaction method is widely used in various foundation treatment projects, but its reinforcement mechanism still lags behind the practice. In view of this, a three-dimensional fluid–solid coupling dynamic analysis model was established on the basis of the FDM–DEM coupling method. The variation trends of crater depth, soil void ratio, vertical additional dynamic stress, and pore water pressure during the process of dynamic compaction were analyzed. The results indicate that the curvature of the crater depth fitting curve gradually decreases with the increase in strike times, tending to a stable value. The initial particle structure is altered by the huge dynamic stress induced by dynamic compaction. As strike times increase, the soil void ratio decreases gradually. The vertical additional dynamic stress is the fundamental reason resulting in foundation compaction. Precipitation preloading before dynamic compaction can improve the reinforcement effect of dynamic compaction, making up for the deficiency that the vertical additional dynamic stress attenuates rapidly along the depth direction. The simulated CPT results illustrate that the modulus of foundation soil can be increased by 3–5 times after dynamic compaction. The research results can provide important reference for similar projects.

Keywords: foundation treatment; high-energy dynamic compaction; FDM–DEM coupling; granular soil; vertical dynamic stress; effective reinforcement depth; reinforcement mechanism (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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