Study on creep characteristics of strongly weathered phyllite filler

Abstract：In order to study the creep deformation characteristics of phyllite filling roadbed under long-term stress, the indoor uniaxial compression tests of phyllite specimens were carried out by using a lever tester and the variation curves of strain with time under different water content and stress conditions were obtained.The strain curve with different water contents were anayzed and it was found that the axial strain increased with the increase of the water content of the specimen, and the strain would increased greatly when the moisture content exceeded the optimum moisture content.By analyzing the strain curves under different stress conditions, it was found that creep variable and rate increased significantly with the increase of the strain.The results showed that the creep deformation of phyllite filler was the result of hydro-mechanical coupling, and it would be larger under the condition of high stress level and high water content.Finally, the exponential decay model of creep was established according to the deformation curve, which could predict creep deformation of phyllite filler better.

Keyword：strongly weathered phyllite;creep deformation;exponential decay model;hydro-mechanical coupling;