EFFECTS OF SLAKING CREEP DEFORMATION ON STRENGTH CHARACTERISTICS OF GRAVELLY MUDSTONES

Abstract

In order to investigate the slaking induced creep deformation and shear strength reduction of crushed mudstones （JGS slaking index = 1）, a series of direct shear tests were conducted under the different stress ratio and initial water content of the specimen. The specimens at different initial water content were subjected to full-saturation under creep shear stress condition. After when the creep shear displacement became stable, a monotonic shear loading was applied. It was found that the creep shear deformation by immersion became larger as decrease in the initial water content and increase in the stress ratio. The shear strength tended to decrease as shear deformation by the immersion became larger.