INTERFACIAL STRESS–DILATANCY BEHAVIOR OF GEOGRIDS IN SOILS REINFORCED WITH RECYCLED WASTE PET

Year 2026, Volume: 14 Issue: 1, 249 - 265, 01.03.2026

Mitat Öztürk

https://doi.org/10.36306/konjes.1622374

https://izlik.org/JA85TH27MT

Abstract

In recent decades, the significant increase in the production of plastics and the inability to recycle it has caused a remarkable environmental impact; therefore, it is necessary to decrease the harmful environmental impacts of waste plastic with sustainable and innovative solutions. The aim of this investigation is to demonstrate the threefold benefits of using polyethylene terephthalate (PET) as a soil improvement agent in geogrid reinforced soil, such as reusing a waste material by recycling it from nature, reducing the negative effects of geogrid reinforcement, and revealing the interfacial stress dilatancy behavior. Direct shear experiments were performed on wet sand with 2 different geogrids and waste PET with 2 different aspect ratios. The outcomes were evaluated based on interfacial shear characteristics, interfacial peak friction angle, dilation behavior, maximum dilation angle, and friction angle-dilation angle relationship. Using geogrid for soil reinforcement decreased the maximum shear stress by 13.01%, while the use of PET reinforcement enhanced it by 22.60%. The reduction in shear strength, friction, and dilation angles in geogrid-reinforced soil is eliminated by adding PET; therefore, it is anticipated that this will lead to an improvement in the utilization rate of waste PET in geotechnical engineering.

Keywords

Dilation angle , Direct shear test , Geogrid , Peak shear stress , Soil improvement , Waste PET strips

Ethical Statement

The paper is conducted in accordance with ethical standards.

Thanks

The author would like to thank Geoplas company for their valuable contribution in providing the geogrid material.

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