Three-dimensional optimization of wave barriers for mitigating ground vibrations induced by underground train

Area of Science:

• Geotechnical Engineering
• Computational Mechanics
• Vibration Mitigation

Background:

• Underground trains generate vibrations affecting residents, buildings, and equipment.
• Wave barriers are effective for reducing vibration propagation.
• Optimizing barrier design involves complex parameter interactions.

Purpose of the Study:

• To find optimal wave barrier designs for vibration reduction using computational methods.
• To evaluate the effectiveness of in-filled trenches and topology-optimized barriers.
• To provide a comprehensive solution for vibration mitigation for Tehran metro line 4.

Main Methods:

• Coupling three-dimensional finite element method (FEM) with an optimization algorithm.
• Evaluating two barrier strategies: in-filled trenches and topology-optimized barriers.
• Analyzing barrier performance based on material properties, dimensions, and location.

Main Results:

• Soft-material trenches perform best at maximum depth near the observation point.
• Jet grout trenches are more effective in stiffer soils and at lower train speeds.
• Topology optimization significantly improves hard barrier performance, outperforming dual trenches.

Conclusions:

• Soft-material trenches offer excellent vibration reduction but may have practical limitations.
• Topology optimization is a powerful technique for enhancing the performance of hard barriers like jet grout.
• The coupled FEM and optimization approach provides an effective framework for designing optimal vibration barriers.