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Technical Papers
Aug 7, 2018

Review of the Relationships between Crack Initiation Stress, Mode I Fracture Toughness and Tensile Strength of Geo-Materials

Authors: Xueliang Xu, Shunchuan Wu [email protected], Aibing Jin, and Yongtao GaoAuthor Affiliations
Publication: International Journal of Geomechanics
Volume 18, Issue 10
https://doi.org/10.1061/(ASCE)GM.1943-5622.0001227
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Abstract

It has been accepted that, in geo-materials, almost all the cracks forming at final failure in the tension test and those occurring at the crack initiation (CI) and crack propagation stages in the compression test are tensile cracks. Because of this, tensile strength is attracting more attention. Compared with the experiment for obtaining tensile strength, the results obtained from a CI stress experiment are inaccurate for the subjective judgments of the user, and the results obtained from the fracture toughness test show a rather large variation of 30–50%. A review was conducted to determine the relationships among CI stress, Mode I fracture toughness, and tensile strength from the view of the failure mechanism and the data gathered from the available literature. It was found that CI stress has a linear relationship with Brazilian tensile strength with the linear coefficient of 0.075, and the linear coefficient between Mode I fracture toughness and tensile strength is in the range of 0.1–0.15, although both correlation coefficients are at a low level. The relationships can be the basis for preliminary design purposes and for rock classification and characterization. It is suggested that the shape of the sample for testing should be consistent and the methods for obtaining each property should be standardized, and more data are needed for further study.

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Acknowledgments

The research was supported by the National Natural Science Foundation of China (Grant 51174020) and High Speed Railway Joint Fund of National Natural Science Foundation of China (U1434211).

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Go to International Journal of Geomechanics
International Journal of Geomechanics
Volume 18 • Issue 10 • October 2018

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© 2018 American Society of Civil Engineers.

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Received: Mar 27, 2017
Accepted: Mar 2, 2018
Published online: Aug 7, 2018
Published in print: Oct 1, 2018
Discussion open until: Jan 7, 2019

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Xueliang Xu
Research Assistant, Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, No. 2, Daliushu Rd., Haidian District, Beijing City 100081, China.
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Shunchuan Wu [email protected]
Professor, Faculty of Land Resources Engineering, Kunming Univ. of Science and Technology, No. 68, Wenchang Rd., 121 Avenue, Yunnan Province, Kunming City 650093, China; Research Scholar, School of Civil and Environment Engineering, Univ. of Science and Technology Beijing, No. 30, Xueyuan Rd., Haidian District, Beijing City 100083, China (corresponding author). Email: [email protected]
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Aibing Jin
Professor, School of Civil and Environment Engineering, Univ. of Science and Technology Beijing, No. 30, Xueyuan Rd., Haidian District, Beijing City 100083, China.
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Yongtao Gao
Professor, School of Civil and Environment Engineering, Univ. of Science and Technology Beijing, No. 30, Xueyuan Rd., Haidian District, Beijing City 100083, China.
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