Geofoam Applications in Earth Pressure Mitigation

Geofoam, typically comprising expanded polystyrene (EPS) blocks, has emerged as a versatile geotechnical material for mitigating earth pressures on engineered structures. Its lightweight and highly compressible nature allows it to act as a deformable buffer that alters stress distribution and reduces both static and dynamic loads imposed by backfill soils. In retaining wall applications, inclusion of geofoam between the wall and the soil mobilises shear strength in the backfill while diminishing lateral earth pressure. In the case of buried pipelines and cut-and-cover tunnels, geofoam layers have been shown to lower vertical and circumferential stresses, thereby extending service life and reducing maintenance requirements. Under seismic loading, geofoam’s energy dissipation capacity attenuates the transmission of dynamic waves to foundations and substructures. Advances in laboratory testing, numerical modelling and field trials across diverse geological settings have refined design approaches, optimising block density, thickness and layering schemes. The modular and rapid installation characteristics of geofoam underpin its global significance in sustainable infrastructure development.

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Geofoam Applications in Earth Pressure Mitigation publication trend

The graph below shows the total number of articles in geofoam applications in earth pressure mitigation across all publications each year (not limited to Nature Index journals).

Technical terms

Geofoam: A lightweight, compressible cellular fill material, commonly made from expanded polystyrene, used to modify stress distribution in soils.

Lateral earth pressure: The horizontal component of stress exerted by soil onto retaining structures, influenced by backfill properties and wall movement.

Finite element method: A computational technique that divides a complex structure into discrete elements to approximate stress, strain and deformation under loading.

Energy dissipation: The process by which dynamic mechanical energy is absorbed or redistributed within materials, reducing transmitted forces to adjacent structures.

References

1. A case study on the potential benefits of using expanded polystyrene geofoam to mitigate seismic impact on structures. Hybrid Advances (2024).
2. Effects of Geofoam Panels on Static Behavior of Cantilever Retaining Wall. Advances in Civil Engineering (2018).
3. Evaluating the Role of Geofoam Properties in Reducing Lateral Loads on Retaining Walls: A Numerical Study. Sustainability (2021).
4. Model Tests of Earth Pressure on Buried Rigid Pipes and Flexible Pipes underneath Expanded Polystyrene (EPS). Advances in Civil Engineering (2019).
5. Modification of Vertical Earth Pressure Formulas for High Fill Cut‐and‐Cover Tunnels Using Experimental and Numerical Methods. Mathematical Problems in Engineering (2019).