Parametric Studies of the Load Transfer Platform Reinforcement Interaction with Columns

Area of Science:

• Geotechnical Engineering
• Civil Engineering
• Materials Science

Background:

• Traditional 2D methods for analyzing geosynthetic reinforcement in improved soft ground are insufficient for capturing complex 3D behavior.
• Existing 2D FEM models do not fully analyze reinforcement material performance under load.

Purpose of the Study:

• To analyze the 3D behavior of the membrane reinforcement in a load transfer platform (LTP).
• To investigate the influence of column interaction, cap shape, Poisson's ratio, subgrade reaction, and load distribution on reinforcement performance.

Main Methods:

• Utilized 3D finite element method (FEM) modeling with slender shell elements to represent membranes.
• Employed the theory of large deformations for membrane analysis.
• Investigated various parameters including column cap shape, Poisson's ratio, and subgrade reaction (k).

Main Results:

• Identified that maximum strains in the reinforcement membranes occur near the column cap edges.
• Observed that these high-strain zones are oriented diagonally between columns when soil resistance between columns is absent.
• Demonstrated that the shape of the column cap (square or circular) does not alter this strain localization pattern in the absence of soil resistance.

Conclusions:

• 3D modeling is crucial for accurately assessing the performance of reinforcement membranes in LTPs.
• The interaction between columns and reinforcement, along with soil properties, significantly affects strain distribution.
• Design considerations for LTPs should account for strain concentrations near column caps, particularly in scenarios with limited soil confinement.