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A New Rock Brittleness Index Based on the Peak Elastic Strain Energy Consumption Ratio
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A New Rock Brittleness Index Based on the Peak Elastic Strain Energy Consumption Ratio
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Journal Article
A New Rock Brittleness Index Based on the Peak Elastic Strain Energy Consumption Ratio
2022
Overview
To evaluate rock brittleness more accurately, a new rock brittleness index based on the peak elastic strain energy consumption ratio (PEECR) was proposed in this study. Considering the relationship between rock brittleness and energy evolution characteristics of rock materials under confining pressure, the PEECR was defined as the dissipated proportion of peak elastic strain energy relative to failure energy and residual elastic strain energy (the maximum value of PEECR is 1.0, which indicates the corresponding rock will fail immediately after reaching the peak strength). The evaluation accuracy of the PEECR was verified based on the conventional triaxial compression tests on shale under six confining pressures, and the universality of the PEECR was also analyzed according to test data of six types of rocks from previous studies. The results show that the PEECR continuously decreases with the increasing of confining pressures, and is suitable for various types of rocks and a wider range of brittleness degrees. Finally, the evaluation accuracies of the PEECR and 11 existing rock brittleness energy indexes were compared and analyzed, and the results indicate that PEECR can evaluate rock brittleness more accurately.HighlightsA new rock brittleness index based on peak elastic strain energy consumption ratio (PEECR) was proposed considering the relationship between the rock brittleness and energy evolution characteristics of rock materials under confining pressures.It is verified based on conventional triaxial compression tests that PEECR can accurately evaluate rock brittleness, and is suitable for various types of rocks and a wider range of brittleness degrees.The evaluation accuracy for rock brittleness of PEECR is higher than other existing indexes by comparison based on test results, and PEECR can be popularized in practical application.
Publisher
Springer Nature B.V
Subject
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