Abstract
The three-dimensional (3D) morphology of a rock joint has a great impact on its shear behavior. To study the relationship between the 3D morphological characteristics and the peak shear strength, several tilt tests were conducted on four groups of tensile fractures and direct shear tests were carried out under different constant normal loads (CNL). The normal load ranges from 0.325 to 8.0 MPa. In this study, fresh tensile fractures which were splitted from granite and sandstone samples were used. The morphology of each tensile fracture was measured before direct shear tests. A new peak shear strength criterion for rock joints is proposed using two 3D morphological parameters which are termed as the maximum apparent dip angle \(\theta_{\max}^{*}\) and the roughness parameter C. The calculated peak strengths using the proposed criterion match well with the observed values. In addition, a comparison of the proposed model with the Grasselli’s model (2003) and Xia’s model (2014) shows that the proposed model is easier in the form and gives a rational improvement. At last, direct shear test data of tensile fractures which are collected from Grasselli (2003) are used to verify the proposed model. It is seen that the proposed model has a reliable estimate of the peak shear strength of tensile fractures and presumably for rock joints.
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Abbreviations
- A 0 :
-
Maximum potential contact area ratio for the specified shear direction
- A t :
-
Sum of area facing to the shear direction (mm2)
- A :
-
Total fracture surface area (mm2)
- \(\theta_{\max}^{*}\) :
-
Maximum apparent dip angle in the shear direction (°)
- C :
-
Roughness parameter characterizing the distribution of apparent dip angles over the fracture surface
- \(\theta_{\text{cr}}^{*}\) :
-
Threshold apparent dip angle (°)
- θ :
-
Dip angle of the triangular element (°)
- t :
-
The shear vector
- n :
-
Outward normal vector of the triangle element
- n 1 :
-
The projection vector of n
- α :
-
The angle between n 1 and t, measured clockwise from t (°)
- JRC:
-
Joint roughness coefficient
- JCS:
-
Joint wall compressive strength (MPa)
- UCS:
-
Uniaxial compressive strength (MPa)
- τ p :
-
Peak shear strength (MPa)
- σ n :
-
Applied normal stress (MPa)
- σ t :
-
Tensile strength (MPa)
- φ b :
-
Basic friction angle (°)
- φ r :
-
Residual friction angle (°)
- d n :
-
Peak dilatancy angle (°)
- s n :
-
Represents failure of intact material (°)
- \(\phi_{\text{p}}\) :
-
Total friction angle (°)
- \(\alpha_e^0\) :
-
Initial effective asperity angle (°)
- α e :
-
Effective asperity angle (°)
- b :
-
A material parameter
- β :
-
Angle between the schistosity plane and the plane normal to the joint (°)
- \(\bar{\sigma}_{\text{ave}}\) :
-
Average estimate error
- τ mea :
-
Measured peak shear strength (MPa)
- τ cal :
-
Calculated peak shear strength by the criteria (MPa)
- m:
-
Number of samples
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Acknowledgments
The research work presented in this paper is supported by the National Basic Research Program of China (“973” Program, grant no. 2011CB013501), the National Natural Science Foundation of China (Grant No. 50979081) and the Program for New Century Excellent Talents in University (grant no. NCET-11-0406). The authors are grateful for these financial supports. We are immensely grateful to the anonymous reviewers for their constructive comments and suggestions to improve this paper.
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Yang, J., Rong, G., Hou, D. et al. Experimental Study on Peak Shear Strength Criterion for Rock Joints. Rock Mech Rock Eng 49, 821–835 (2016). https://doi.org/10.1007/s00603-015-0791-1
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DOI: https://doi.org/10.1007/s00603-015-0791-1