| Summary: | Awareness of peoples towards environmental impact assessment to sustainable development have been progressively increase from time to time. For that reason, this research is focusing on the effect of the usable daily cooking oils to the shear strength of soil which easily thrown into the soil in the backyard of the houses. Due to that, the mixing of oil with water in the soil may lead to reduction in shear strength and thus will lead to failure in a foundation of structures. This study was carried out to investigate the effect of shear strength of soil when mixing with usable cooking oil with 5% and 10% and compared it with the soil without mixing with usable cooking oil using single stage triaxial consolidated drained test. Finding reveal that there is significant reduction in shear strength for control specimens with the mixing of 5% and 10% of usable cooking oil. For control specimens, the shear strength was at 26° of effective friction angles whereas for specimens mixing with 5% and 10% was at 22° and 20° respectively. The shear strength was deduced for about 6° for specimens in natural and mix with 10% of usable cooking oil. In the end, results show that reduction in shear strength will continuously decreased with the increase of the quantities of usable cooking oil and thus will reflect towards the failure of a foundation. © Published under licence by IOP Publishing Ltd.
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