Fatigue Analysis and Numerical Simulation of Loess Reinforced with Permeable Polyurethane Polymer Grouting
Lisha Yue1,2, Xiaodong Yang3, Shuo Liu1
1School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Polymers
|January 28, 2026
Summary
Permeable polyurethane polymer grouting significantly enhances the fatigue life of loess subgrades. This non-excavation technique improves strength and reduces deformation under cyclic loads and moisture, crucial for sustainable infrastructure.
Area of Science:
- Geotechnical Engineering
- Materials Science
Background:
- Loess subgrades suffer strength loss and deformation from traffic loads and moisture.
- Permeable polyurethane polymer grouting offers a non-excavation solution for subgrade reinforcement.
Purpose of the Study:
- To investigate the fatigue behavior of polymer-grouted loess.
- To develop a probabilistic fatigue life prediction model.
- To assess the effectiveness of polymer grouting using numerical simulations.
Main Methods:
- Laboratory stress-controlled cyclic fatigue tests on grouted loess specimens.
- Statistical analysis using Weibull distribution.
- 3D finite element modeling (FEM) in Abaqus integrated with Fe-safe.
Main Results:
- Fatigue life decreased with higher moisture and stress levels, reaching 200,000 cycles optimally.
- Failure exhibited three stages and a "multiple-crack" mode, improving ductility.
- Polymer grouting reduced subgrade stress by ~10x and increased fatigue life by ~10x.
Conclusions:
- Permeable polyurethane polymer grouting enhances loess subgrade fatigue resistance.
- The probabilistic model and FEM approach are reliable for predicting fatigue life.
- This technique supports sustainable infrastructure development in loess regions.
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