Rockfill serves as the primary filling material in earth rock dams.Its wetting deformation characteristics have a significant influence on dam deformation during impoundment.Employing the single line method,we con-ducted extensive indoor triaxial wetting deformation tests under confining pressures of 0.5,1.0,2.0,and 3.0 MPa on two types of rockfill materials sourced from Lianghekou Hydropower Station.Results indicate a substantial in-crease in both axial and volumetric wetting deformations as stress levels and confining pressures escalate.This be-havior aligns with wetting deformation patterns observed under medium and low confining pressures.Notably,under high isotropic confining pressure,volumetric wetting strain correlates linearly with confining pressure in double log-arithmic coordinates,whereas axial wetting strain and confining pressure no longer meet a linear relationship.More-over,at high unsymmetrical confining pressures,the ratio of volumetric wetting strain to axial wetting strain typical-ly ranges from 0 to 2,exhibiting a nearly horizontal trend with increasing confining pressure.The six-parameter wet-ting model remains adept at accurately characterizing the axial and volumetric wetting deformation behaviors under varying stress levels and confining pressures.
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