The reuse, recycling, or disposal of increasing quantities of post-consumer plastic materials, particularly Polyethylene Terephthalate (PET) bottles, is an ongoing global challenge due to the low natural degradation rates of such products. This paper thus experimentally studied the effect of reusing post-consumer plastic bottles as soil-filled reinforcement for the soil above shallow buried unplasticized Polyvinyl Chloride (PVC-U) pipes using a laboratory model. The hypothesis was that a plastic bottle wall would operate to contain soil within them, causing the bed to behave in a similar manner to a block load distribution zone above the shallow buried pipe. Backfilling was done as the soil-filled plastic bottles were vertically placed within the soil bed at the proper depth, and the influence of various factors, such as the soil-filled bottle-reinforced area's depth of placement (u) and width (b) were examined under static loading. According to the test data, a bottle-reinforced bed is exceptionally stiff, giving very high soil-bearing capacity with even minor soil settlement above buried pipes. The optimum depth of placement and width of the plastic bottle-reinforced layer were 0.50B and 2.08B, respectively, where the bearing capacity ratio (BCR) of the soil was improved by a factor of ∼1.48. Using waste plastic bottles was thus seen to improve project economy overall as well as minimising any costs of waste bottle disposal.

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