Effects of wet-dry cycles on the bimodal soil-water characteristic curve and unsaturated permeability of granite residual soil.

ABSTRACT: The unsaturated permeability coefficient of granite residual soil (GRS) increases rapidly with rising moisture content, as the loss of matric suction enhances the continuity of the water phase within the soil pores. This can lead to slope instability and embankment collapse during rainfall. This study investigated the effects of wet-dry cycles on the hydraulic and microstructural evolution of GRS, introducing key innovations over prior research. First, microstructure changes were investigated using mercury intrusion porosimetry (MIP) tests, investigates the evolution of bimodal pore structure under cyclic wetting and drying. Second, the entire range of matric suction was comprehensively measured by integrating the pressure plate method (PPM), filter paper method (FPM), and vapor equilibriu

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC12798966 | biostudies-literature | 2026

REPOSITORIES: biostudies-literature