Abstract
The nonlinear dynamic properties of highly organic soils from two levee sites in the Sacramento-San Joaquin Delta in California are described. Cyclic triaxial, resonant column and torsional shear tests were performed on thin-walled tube samples obtained from beneath levee crests, beneath adjacent berms, and in the free field such that the in situ vertical effective stresses ( σ vo ′ ) ranged from about 16 to 67 kPa . These highly organic soils had considerably different organic characteristics from those used in previous studies of dynamic properties. The tested samples had organic contents of 14 to 61%, initial water contents ( wo ) of 88 to 496%, shear wave velocities ( Vs ) of 20 to 130 m∕s , and organic components that ranged from highly fibrous to highly decomposed and amorphous. Secant shear modulus (G) , normalized secant shear modulus (G∕ Gmax ) , and equivalent damping ratio (ξ) versus cyclic shear strain amplitude ( γc ) relations are presented, and their dependence on variables such as consolid...
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