Stress Conditions and Stress Histories Affecting Shear Modulus and Damping of Sand under Cyclic Loading

摘要: ABSTRACT To evaluate the effects of various static stress conditions and histories on shear modulus damping sand under cyclic loadings, a comprehensive series torsional tests hollow cylindrical specimens clean was performed. All were performed constant value mean principal = 1.0kgf/cm2 (about 100 kN/m2) fully drained condition. From test results, followings found. For wide range strain amplitude (γ 5 × l0-5 ~ 5 × l0-3), effect ratio is minor in triaxial compression case but considerable extension case. Initial decreases especially for Although affected by conditions, its strain-dependency insensitive to those conditions. The initial are less important than γ p. It found that overconsolidation history previous larger G ƞ also