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Empirical Formula of Shear Strength of Rock Fractures Based on 3D Morphology Parameters

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Abstract

The prime objective of this work is to provide a reference to predict the peak shear strength of rock fractures. The paper studied some shear properties of rock fractures and proposed an empirical formula for the peak shear strength of rock fractures based on 3D morphology parameters. The rock fractures were induced in cylindrical sandstone and marble specimens by means of indirect tension. A rock direct shear apparatus (RDS-200) was adopted to conduct direct shear tests on five groups of rock fractures under different levels of normal load. Before the direct shear test, 3D morphology parameters of rock fracture surfaces were obtained using a 3D optical scanner. By analyses of direct shear test data, the relationships between peak shear strength, peak shear displacement, peak dilatancy angle, residual friction coefficient and peak normal stress were found. According to the evolution trends of peak shear strength and peak dilatancy angle along with the normal stress, an empirical formula was proposed to predict the peak shear strength of rock fractures in both sliding and cutting failure modes considering the 3D morphology parameters of rock fracture surfaces. The empirical formula could be commonly used for different types (sandstone and marble) and grain sizes (powder-grained, fine-grained, medium-grained and coarse-grained) of rock fractures.

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Acknowledgments

This research is supported by the China National Natural Science Foundation (Project Nos. 51109076) and the key scientific and technological project of Henan Province (152102210316). The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China

    Hangyu Dong, Baohua Guo, Yizhe Li, Kai Si & Long Wang

  2. Collaborative Innovation Center of Coal Work Safety, Jiaozuo, 454000, People’s Republic of China

    Baohua Guo

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  1. Hangyu Dong
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  2. Baohua Guo
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  3. Yizhe Li
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  4. Kai Si
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  5. Long Wang
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Correspondence to Baohua Guo.

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Dong, H., Guo, B., Li, Y. et al. Empirical Formula of Shear Strength of Rock Fractures Based on 3D Morphology Parameters. Geotech Geol Eng 35, 1169–1183 (2017). https://doi.org/10.1007/s10706-017-0172-5

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  • DOI: https://doi.org/10.1007/s10706-017-0172-5

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