Abstract
Determining the shear strength of rock joint surfaces is a fundamental problem in the fields of rock mechanics and engineering geology. To obtain the cyclic shear strength of rock joint surfaces under cyclic shearing conditions, an improved formula is proposed. First, cubic splitting tests are used to fabricate joint surfaces and prepare experimental specimens with simulated materials. Second, a series of laboratory cyclic shear tests and data analysis are conducted to investigate the effects of the normal stress, the number of shearing cycles, the rock wall strength, and the surface roughness on the mechanical and morphological properties of the rock joints. The maximum shear strength of the joint surface increases with the normal stress, the rock wall strength, and the joint surface roughness. Considering morphological properties, the normalized values of the indices decrease with the normal stress, the number of shearing cycles, and the joint surface roughness increase, while they increase with increasing rock wall strength. Third, the accuracy of the Adhesive Friction Theory-Barton empirical formula is verified by fitting the experimental data to calculation results. Finally, based on the negative exponential degradation assumption, a new formula is proposed to calculate shear strength under cyclic shear conditions. The proposed calculation method can provide a theoretical reference for improved safety during engineering and design.
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Data are available on request from the corresponding author.
Abbreviations
- A n :
-
Nominal area of the joint surface
- A t :
-
Actual area of the joint surface
- A c :
-
Projection of the joint surface contact area along the normal load direction
- A :
-
Area of the joint surface
- R s :
-
Relative roughness coefficient
- Z2s :
-
RMS of the surface first derivative
- z:
-
Height at a certain point
- N x and N y :
-
Total number of profile points in the \(x\) and \(y\) directions
- ∆ x and ∆ y :
-
Sample intervals of the joint surface along with the x and y directions
- δ :
-
The interpolation scale
- σ n :
-
Normal stress
- σ en :
-
Effective normal stress acting on the joint surface
- JCS :
-
Uniaxial compressive strength of the specimen
- JRC :
-
Roughness coefficient equalling to the \({A}_{c}\)/\({A}_{n}\)
- a and b :
-
Fitting parameter
- N d :
-
Number of shearing cycles
- τ :
-
Shear strength
- φ b :
-
Basic friction angle
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Acknowledgements
The authors are thankful to all the contributors and workers of this survey, especially the anonymous reviewers who helped to improve the quality of this paper.
Funding
This work is supported by National Key R&D Programs for Young Scientists (no. 2023YFB2390400), the National Natural Science Foundation of China (nos. U21A20159, 52079133, 52379112, 41902288), Key Research Program of FSDI (2022KY56(ZDZX)-02), Key Research Program of the Ministry of Water Resources (SKS-2022103), Yunnan Major Science and Technology Special Program (202102AF080001), Visiting Researcher Fund Program of State Key Laboratory of Water Resources Engineering and Management(Grant No. 2023SGG07), and the project of Key Laboratory of Water Grid Project and Regulation of Ministry of Water Resources (QTKS0034W23291).
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J.Y.: conceptualization, formal analysis, visualization, writing–original draft, methodology, data curation. Z.C.: conceptualization, funding acquisition, writing–review and editing. Q.S.: supervision, validation, project administration. J.C.: supervision, validation, project administration. M.Z.: methodology, resources.
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Yin, J., Cui, Z., Sheng, Q. et al. Study on shear mechanical characteristic evolution and influencing factors of rock joint surfaces under cyclic loading conditions. Bull Eng Geol Environ 83, 32 (2024). https://doi.org/10.1007/s10064-023-03530-8
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DOI: https://doi.org/10.1007/s10064-023-03530-8