Physical and 3D numerical modelling of reinforcements pullout test

Area of Science:

• Geotechnical Engineering
• Soil Mechanics
• Reinforced Soil Structures

Background:

• Steel and polymeric strips are common reinforcements in soil walls with concrete facing.
• Standard pull-out tests are crucial for determining reinforcement strength but are often costly and impractical.
• Existing design codes offer default pull-out strength values that may be conservative or not specific to reinforcement types.

Purpose of the Study:

• To report results from laboratory and 3D numerical pull-out tests on steel and polymeric reinforcements.
• To validate numerical models for predicting soil-reinforcement interaction under various conditions.
• To provide a more accurate and efficient method for assessing pull-out strength in reinforced soil walls.

Main Methods:

• Conducted laboratory pull-out tests simulating different confining pressures and reinforcement arrangements.
• Developed and calibrated 3D numerical models to replicate laboratory test conditions.
• Analyzed soil-reinforcement interfaces, pull-out loads, displacements, and soil-dilatancy effects.

Main Results:

• Calibrated numerical models accurately predicted pull-out response, including loads and displacements.
• Demonstrated the influence of reinforcement, soil, and interface stiffness on pull-out behavior.
• Identified key mechanisms governing soil-reinforcement interaction through numerical simulations.

Conclusions:

• Calibrated numerical models offer a viable alternative to expensive laboratory tests for predicting pull-out strength.
• Numerical simulations provide valuable insights into the complex interactions within reinforced soil walls.
• Findings support improved design and investigation of reinforced soil walls using site-specific data and modeling.