Shear strength behaviour of liquefiable sand of petobo on treated by agarose under direct shear test

Abstract

Liquefaction process is associated with the loss of the shear strength of the saturated loose sands caused by strong earthquakes. Due to mitigitation of liquefaction hazard, an appropriate mitigation of liquefaction using environmentally friendly methods is critical and becoming increasingly important and unavoidable. The laboratory investigation was carried out to study the shear strength behaviour of liquefiable sand of Petobo treated by agarose on different concentration 1%,3% 5%. A series of direct shear test were conducted under three level of vertical stress 10 kPa, 20 kPa, and 30 kPa on the specimen. It was found that the optimum content of agarose which can be considered is at 1%-3%, using stress ratio (τ/σv) analysis shows that stress ratio decreases with increasing the vertical stress on the same agar content. The implication this result that the application of this method must consider variation of material source and characteristic, and the suitable level of vertical stresses.

Soil Improvement of Petobo Silty Sand using Ferronickel Slag and Alkaline Activators

“…As reported by Kusumawardani et al (2021); Upomo et al (2023); Jalil et al (2021); and Gallant et al (2020), the Petobo area experienced a huge liquefaction flow slide during the Palu-Donggala earthquake on September 28, 2018. A bio-polymer soil treated technique by using agarose has been applied by Beddu et al (2022) for Petobo silty sand. It indicates that this technique might be effective for low confining stress or shallow surface treatment.…”