INFLUENCE OF ENVIRONMENT TEMPERATURE ON STRENGTH AND DEFORMATION OF SALINE SOIL IN INSHORE CONTAMINATED BY PETROLEUM

Environmental temperature affects oil viscosity and then changes the mechanical properties of petroleum contaminated soil. Unconfined compressive strength test is carried out to study the effect of temperature on strength and deformation of saline soils in inshore contaminated by petroleum. Results indicate that:(1) Temperature has significant effects on mechanical properties of oil contaminated saline soil. Compressive strength of petroleum contaminated soil decreases with the increasing of temperature, and reduces nearly 70% at 20℃ and oil content of 15%comparing with that of un-contaminated soils. (2) Unconfined compressive strength increases first and then decreases with the increase of petroleum content. There is an opposite correlation between environmental temperature and petroleum content at maximum strength. The maximum strength with oil content of 15%, 10%, and 5%shows at 10℃, 20℃ and 30℃,respectively. (3) Damage of petroleum contaminated saline soils presents strain softening type with failure plane of 45°±φ/2, and it is intensified with the increasing of petroleum content and temperature. Environmental temperature has obvious effect on the deformation of oil contaminated saline soil.