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01-06-2024 | Original Paper

Measurement of Elastic Bi-modulus of Rock-type Materials: Insight from comparative and parallel tests

Authors: Yan Zhang, Hao Zheng, Huiling He, Peng Sha, Linlin Wang, Shengwen Qi, Xiaolin Huang, Jianhong Ye

Published in: Bulletin of Engineering Geology and the Environment | Issue 6/2024

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Abstract

Rock materials exhibit different elastic moduli under tension and compression, making them typical bi-modulus materials. Few testing methods can measure both tensile and compressive moduli (Et and Ec) of such materials simultaneously, and with their reliability not systematically validated. Taking blue and red sand rocks as the example, this study performed a series of uniaxial compression, direct tension, Brazilian disc, and three-point bending tests, in which strain gauges and DIC technology were used to observe the deformation. Through comprehensively comparative study, the following findings are obtained: (1) Direct tension and compression tests remain the most reliable methods for measuring the Et and Ec of rock materials. (2) Only the sub-method I based on the Brazilian disc test proposed by Ye et al in (Int J Rock Mech Min Sci 46(3):568–576, 2009a) exhibits good reliability. (3) Three-point bending test is not recommended due to the adverse effect caused by the stress concentration in the region beneath the loading head. (4) Strain gauges theoretically offer a high measurement accuracy, but their results are significantly influenced by artificial factors; while DIC technology demonstrates a higher reliability when strain exceeds a threshold (e.g., > 500).

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Metadata
Title
Measurement of Elastic Bi-modulus of Rock-type Materials: Insight from comparative and parallel tests
Authors
Yan Zhang
Hao Zheng
Huiling He
Peng Sha
Linlin Wang
Shengwen Qi
Xiaolin Huang
Jianhong Ye
Publication date
01-06-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 6/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03752-4

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