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Analysis of Constitutive Behaviour on Anisotropic Rock
Indra Karna Wijaksana

Bandung Islamic University


Abstract

Many exposed rocks show well-defined fabric elements in the form of bedding, stratification, layering, foliation, fissure, or joint. In general, these rocks have properties (physical, dynamic, thermal, mechanical, and hydraulic) that vary with direction and are said to be inherently anisotropic. Evaluating anisotropic mechanical properties helps to predict the behavior of rock materials in analysis, design, and construction, and improves the quality and safety. This research discussed laboratory testing and analytical methods to determine the four values of elastic constants of transversely isotropic slate rock. Analytic calculations were performed to determine the elastic constants of rock material with the assumption of linear, elastic, homogeneous, and transversely isotropic. The strain value was determined at of 50% of peak stress on stress-strain curves. Multilinear regression analysis with least squares estimation method was used in determining the linear equation to get to the four elastic constants of the rock. In this study, the rock used as an example in laboratory tests obtained from two pieces of slate stone blocks from the Bora river, Central Sulawesi Palu area. These rocks have foliation that appears on the surface, and therefore these rocks will be treated as a transversely isotropic material. The results of uniaxial compression tests revealed that for the slate rock, the deformability in the direction that is normal to the plane of transverse isotropy (θ = 85o) is greater than that is parallel to the plane of transverse isotropy (θ = 5o) or, in other words, E1 > E2.

Keywords: transversely isotropic rock, elastic constants, uniaxial test

Topic: Mining Engineering

Link: https://ifory.id/abstract/YNZ84ctm7njx

Conference: The Third International Conference on Innovation in Engineering and Vocational Education (ICIEVE 2019)

Plain Format | Corresponding Author (indra karna wijaksana)

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