Performance of mechanical agitation type of ground-improvement by CAE system using 3-D DEM

Evaluation of Discharging Surplus Soils for Relative Stirred Deep Mixing Methods by MPS-CAE Analysis

“…In DMMs, while the stirring wing penetrates the targeted soft ground, slurry-like or powder-like solidifying material and the soft ground are forcibly stirred and mixed to construct a columnar improved body in the targeted soft ground. One of the DMMs, the relative stirred deep mixing method (RS-DMM), is a method of rotating the inner and outer wings of the stirring wing in opposite directions at different speeds while discharging a slurry-like solidifying material from the tip of the stirring wing [9,12,13]. By rotating the inner and outer wings in opposite directions, it is possible to add the effects of "kneading" and "mixing" to the mixing of the targeted soft ground and the solidifying material.…”

“…The possibility and validity of applying the MPS-CAE analysis to the ground and ground-improvement methods has been clarified by Inazumi et al [13,18,[20][21][22] and Nakao et al [23].…”

Numerical Simulation of the Liquefaction Phenomenon by MPSM-DEM Coupled CAES

“…Table 1 shows the physical characteristics of the water particles modeled by the MPSM, while Table 2 shows the physical characteristics of the sand particles modeled by the DEM. The MPSM parameters of water can be established by referring to the physical characteristics of water at a temperature of 20 • C [35], and the DEM parameters of the sand particles can be found by referring to the parameters used in previous studies [12,13,24,28,30,36,37]. Considering the time required for the calculation, the distance between the particles in the MPSM was set at 20 mm, and the particle size in the DEM was set at 20 mm.…”

“…Based on the above background, the mechanism of liquefaction generation is visualized theoretically in this study, using a coupled computer-aided engineering system (CAES), the moving particle semi-implicit method (MPSM), and the discrete element method (DEM) [12,13]. CAES is a general term for technology that includes using a computer to simulate and analyze prototypes created using computer-aided design (CAD), considering the site conditions.…”

“…By visualizing the liquefaction phenomenon, it is expected that the mechanism of liquefaction generation will be clearly shown and that this will contribute to the development and accountability of more efficient and economical liquefaction countermeasures. By utilizing CAES to recreate the phenomenon of liquefaction, it is possible to visualize the generating mechanism of liquefaction, which cannot normally be seen in the natural ground, and solve the complicated problems associated with its manifestation [12,13]. In addition, since design and evaluation can be performed while comparing and examining the models of various ground conditions, it is thought that the design quality can be improved at an early stage and that a more effective construction method can be designed.…”