Abstract
Two-order morphology of rock joints named as waviness and unevenness can be separated by morphology classification method, which plays a decisive role in the evolution of shear stress during the shear test. The joint morphology is obtained by using 3D printing and 3D laser scanning techniques and the joint model samples in two-order morphology are produced by cement mortar. Then, shear tests are performed under different normal loads. Results shows that the waviness is dominant in the total morphology during the shear test, and the shear contribution of unevenness mainly occurs in the climbing phase of shearing process. Comparing the failure modes of two-order morphology, waviness mainly embodies shear dilation characteristics and unevenness mainly shows shear wear characteristics. Based on this, a quantitative parameter is proposed to represent the ratio of the peak shear strength of the two-order morphology to that of total morphology. The functional relationship between the peak shear strength of total and two-order morphologies is determined, providing a theoretical method for further in-depth study on the shear strength of the interaction with two-order morphology of rock joints.
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Abbreviations
- a :
-
Contribution coefficients of waviness
- b :
-
Contribution coefficients of unevenness
- r :
-
Ratio of shear strength
- δ :
-
Sampling interval
- δ c :
-
Limit sampling interval
- σ n :
-
Normal stress
- τ p :
-
Shear strength
- φ p :
-
Peak friction angle
- φ b :
-
Basic friction angle
- i p :
-
Peak dilation angle
- τ t :
-
Shear strength of total joints
- τ I :
-
Shear strength of waviness
- τ II :
-
Shear strength of unevenness
- \(\overline {{\tau _f}} \) :
-
Average peak shear strength of flat joints
- \(\overline {{\tau _i}} \) :
-
Average peak shear strength of waviness and unevenness
- \(\overline {{\tau _t}} \) :
-
Average peak shear strength of total joints
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Acknowledgements
The study was funded by National Natural Science Foundation of China (Grant Nos. 42272333 and 42277147). This support is gratefully acknowledged.
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Huang, M., Chen, Xn., Hong, Cj. et al. Shear behavior of two-order morphology in rock joints. J. Mt. Sci. 20, 845–858 (2023). https://doi.org/10.1007/s11629-022-7571-7
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DOI: https://doi.org/10.1007/s11629-022-7571-7