Study on the creep characteristics and constitutive model of schist in natural and saturated states
2017
ABSTRACT: This study explores the creep behaviors of schist in different water contents
and establishes the creep model and its constitutive equations. First, the in situ displacement
tests were conducted and the time-dependent deformation regularity of surrounding rock
was studied based on the sericite schist tunnel construction in the northwest area of Hubei
Province of China. Then, rock samples were taken and shear creep tests were conducted
along the direction of schistosity plane in natural and saturated states. On the basis of the
results of in situ and laboratory tests, a viscoelastic-plastic creep model was constructed by
model identification and introducing a nonlinear rheological component. Finally, parameters
of the creep model were obtained by multiple regression and back analysis and the rationality
of the creep model was verified by comparing it with the experimental data.
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