Characterizing mechanical anisotropy in rocks using instrumented scratch test

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2024-12-25 DOI:10.1016/j.gete.2024.100634

Suman Saurabh, Natalia Zakharova

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Abstract

This study demonstrates a successful application of scratch test to characterizing geomechanical anisotropy in weakly to moderately anisotropic sedimentary rocks. Scratch tests were performed in three orthogonal directions on four sedimentary rock samples: one limestone and three shales, and the scratch-derived mechanical properties were compared to anisotropic parameters calculated from acoustic velocities. Results showed a similar pattern of anisotropy in the scratch-derived unconfined compressive strength (UCS) and fracture toughness (K_IC), and velocity-derived Thomsen’s parameters. The measured values also compared well to previous studies of anisotropy in shales. The UCS and K_IC for shale samples were correlated: shales with higher UCS were also characterized by higher K_IC, and vice versa. The lowest values for both were observed perpendicular to bedding planes. All parameters consistently indicated that three out of four samples were transversely isotropic, and one sample exhibited more orthotropic behavior. Overall, our results indicate that scratch tests provide a simple and reliable tool for screening and potentially quantifying mechanical properties of anisotropic rocks. Compared to the majority of conventional geomechanical methods, which are destructive and require multiple directional samples, scratch test provides an opportunity to characterize mechanical anisotropy with very limited rock material and/or on a single sample.

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.