Shear Strength Behavior of Oil-Contaminated Bushehr Carbonate Sand

The crude oil leakage in soils could lead to an extreme reduction in resistance. It is significant for oil-rich countries, such as Iran, with several crude oil resources. The clean and oil-contaminated Bushehr carbonate coastal sand cyclic simple shear behavior is investigated. The clean and crude oil-contaminated sands were prepared with a relative density of ۶۰%, and oil-contaminated samples were prepared using ۲%, ۴%, and ۶% crude oil. Shear modulus (G) and damping ratio (D) rely on soil particle characteristics. Using ۲% crude in Bushehr carbonate sand leads to an approximately ۵% increase in shear modulus. Also, applying ۴% oil in the specimens caused roughly ۸% enhancement in the dynamic strength of Bushehr carbonate sand. Keeping the conditions constant, the effects of oil contamination on this carbonate sand were investigated using a cyclic simple shear apparatus. The results indicate that ۶% crude oil contamination will lead to a decline in shear modulus (۱۰.۶%), a growth (۲۷.۶%) in the damping ratio, and a decrease (۱۶.۶%) in the friction angle of Bushehr sand in comparison to clean sands. However, ۲% and ۴% contamination led to static and dynamic resistance increase of Bushehr carbonate sand. The results indicated that using ۲% and ۴% crude oil caused a ۱۲.۵% and ۲۰.۸% increase in the static resilience of Bushehr carbonate sand, respectively.

کلیدواژه ها:

Shear modulus ، Damping ratio ، Carbonate Sand ، Oil Contamination ، SEM