Compressibility Behavior of Dunkirk Structured and Reconstituted Marine Soils: Fid-Bau Portal

Compressibility Behavior of Dunkirk Structured and Reconstituted Marine Soils

Wang, Dongxing

Oedometer tests were performed to determine the compression behavior of Dunkirk structured and reconstituted marine soils. The cement-/lime-treated soils can be considered as "artificially structured marine soils" that show "false over-consolidation." The effect of additive on the compression curves and yield consolidation stress was investigated. For marine soils with a water content of 90.9%, cement content should be larger than 2% to form artificially structured soils. Cementing additive leads to a higher initial void ratio at compression starting point. increases with cement content, but a lime addition higher than 2% can not significantly increase . From the curves, C c peaks at 4-6 times of and finally stabilizes with higher . For C c -ω L , C c -ω 0 , and C c -e 0 , the relationships as C c = 0.036(ω L − 50), C c = 0.027(ω 0 −50), and C c = 0.9(e 0 −1.48) can be found for structured marine soils. For C c -ω L of eight clays, the upper and lower boundary can be found and expressed as C c = 0.015(ω L −19) and C c = 0.006ω L . To identify the effect of soil structure, the concept of Δe was introduced. Δe increases with until the maximum at , and then decreases with higher . Different intrinsic state lines were found for soils with different additives. Test data of cement-treated reconstituted soils fit the Burland's equations better than lime-treated soils.