Providing the structural integrity of systems near oil wells is an essential consideration in civil engineering. The oil leakage in soils causes a tormenting strength decrease, which is particularly noteworthy for oil-rich nations, such as Iran, with carbonate sand shores. The static and dynamic behavior of silica sands is not identical to that of carbonate sands. Since a few papers have dealt with oil-contaminated carbonate sands, this investigation seeks to fill the gap by introducing a novel technique for the oil-polluted treatment. The cyclic simple shear behavior and chemical examination investigating the crude oil-contaminated and treated Bushehr carbonate sand (BCS). Zeolite (clean, safe, and environmentally friendly) is introduced as a novel treatment agent. This novel technique outstandingly enhances the resilience of oil-polluted carbonate sand. All samples were constructed with a relative density of 60%. Petroleum-contaminated and zeolite-treated BCS specimens were artificially polluted using 6 wt% crude oil. This research uses simple shear tests (in static and cyclic conditions), consolidation experiments, SEM analysis, and FTIR assessment. Adding 6 wt% zeolite to contaminated BCS is designated as the optimal pollution adsorption. The results proved that adding 6 wt% zeolite increases the shear modulus index by 38.08% and the friction angle index by 16.73%. SEM analysis demonstrates the adsorption of crude oil on the surface of zeolite particles, verifying the efficacy of this agent in the oil removal process. The FTIR analysis displayed that zeolite decreased the Csingle bondH bond related to hydrocarbons. The consequences disclose the optimistic function of zeolite in crude oil-contaminated BCS by pollutant adsorption procedure. With the high specific surface area (SSA) and porous surface of zeolite, the meaningful performance of zeolite is justifiable in this regard.
