Abstract
This article reports on an improved constitutive model for the shear creep behavior of offwhite marbles, which are selected from slope and underground caverns and contain green schist's weak structural planes. The shear creep behavior of the samples is characterized using rheological tests. Based on the experimental measurements on mechanical properties under different normal stress conditions, an improved model is proposed to analyze the experimental results. It is demonstrated from further discussion that such a model can reflect the nonlinear creep characteristics of structural planes, and especially, it is suitable for description of the viscoelastic and viscoplastic deformation behavior of structural planes.
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