Rheological Model Identification of Debris Filled with Mud Weak Interlayer

Abstract

Under the shear rheological conditions, debris filled with mud weak interlayer shows viscoelastic rheological laws. On the basis of non-linear regression analysis of rheological parameters, the relationship between shear stress and rheological parameters was researched. The study reveals that, with the increase of shear stress, weak interlayers instantaneous deformation, constant strain rate and the final elastic strain increase, while the delay time has not been found certain regularity. Under the shear rheological conditions, when the stress level is low, the constitutive model of weak interlayer can be described by Burgers model; when the stress level is high, Cvisc model should be used.