USING TIRE DERIVED AGGREGATES BACKFILLING ALTERNATIVES FOR RETAINING WALL STRUCTURES
Date
2024-08-02
Authors
Elsa Ravi, Aiyleen
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Abstract
Tire derived aggregate (TDA) is a lightweight material suitable to replace conventional fill material in embankments and retaining walls. This paper focuses on using TDA as a backfill for retaining wall. A PLAXIS 2D finite element model has been developed to investigate the effect of TDA as a backfill material for retaining wall and earth pressure against the wall was computed, which was verified against the field measurements. Furthermore, parametric studies were conducted to examine the earth pressure on retaining wall at different backfill slope angles, and subcases were considered by varying the width of backfill TDA layer in each case of slope angle. The study showed that varying the backfill slope angle have only negligible effect on the results. It was also found that increasing the width of backfill TDA layer slightly reduces the earth pressure on the retaining wall.
Description
Around one billion tires reach their useful life every year worldwide. Thus, its important
to manage scrap tires that goes to landfill sites, where they put our environment and health
at risk. Many tire recycling programs were done, where scrap tires were collected and
recycled into various products. Tire derived aggregate (TDA) is one such product. Its
lightweight and free draining properties makes it suitable to replace conventional fill
material by reducing forces between embankments, retaining walls, bridge abutments and
landfill areas. A PLAXIS 2D finite element model has been
developed to investigate the effect of TDA as a backfill material for retaining wall, which
was verified against the field measurements. In the analysis, a linear elastic model is
adopted for concrete, a Mohr-coulomb model for soil and TDA is designed as a hardening
soil model. Furthermore, parametric studies were conducted to examine the earth pressure
on retaining wall at different backfill slope angles, and subcases were considered by
varying the width of backfill TDA layer in each case of slope angle.
Keywords
Tire derived aggregate