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- W2018300418 abstract "Abstract Shales encountered in the overburden above hydrocarbon reservoirs often pose challenges to the stability of boreholes. Consequently, there is a keen interest in borehole stability prediction, which is complicated by the laminated structure of shale that arises as a consequence of the depositional environment. A combined experimental/numerical investigation is being undertaken to address how the directional properties of shale impact borehole stability in weak shale formations. Within this paper an advanced finite element procedure for simulation of progressive damage of orthotropic pressure-sensitive materials is presented, which includes bifurcation and post-bifurcation analysis. This constitutive model is based on critical state theory and is specifically designed to represent the characteristic deformation of weak shale formations. It includes orthotropic elasticity and an orthotropic pressure-dependent yield surface that is curved in the p-q plane, and which intercepts the hydrostatic axis in both tension and compression. A regularization procedure is also presented that ensures mesh invariance and correctly reproduces the dependence of strength on the size of the test specimen. Calibration of the model parameters is also discussed and the model is validated by comparison with the results of uniaxial and triaxial compression tests for Pierre I Shale performed at different bedding plane orientations." @default.
- W2018300418 created "2016-06-24" @default.
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- W2018300418 date "2002-10-20" @default.
- W2018300418 modified "2023-10-18" @default.
- W2018300418 title "Development of an Orthotropic 3D Elastoplastic Material Model for Shale" @default.
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- W2018300418 doi "https://doi.org/10.2118/78238-ms" @default.
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