MODELING EXPERIMENT ON INTERFACE SHEARING BEHAVIOR BETWEEN CONCRETE AND UNSATURATED SOIL WITH VARIOUS DEGREES OF SATURATION

摘要

Degree of soil saturation plays an important role in mechanical behaviour of soil-concrete interface. Experiments by using laboratory simple shear tests are performed on soil-concrete interfaces with 45%, 52%, 63%, three degrees of saturation, where five normal stresses are taken into accounted in each degree of saturation. The experimental data show that failure of interface still satisfies the Mohr-Coulomb criterion under each one fixed degree of saturation. With higher degree of saturation, shearing strength, friction angle of the interface all decrease monotonously and nonlinearly, but cohesion force of the interface first increases and then decreases after reaching a peak value. While degree of saturation is increasing,failure position of the interface moves from concrete surface to soil inner part. This experimental research puts the good foundation for relative engineering numerical simulation.