Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (11): 1609-1617.DOI: 10.12068/j.issn.1005-3026.2021.11.013

• Resources & Civil Engineering • Previous Articles     Next Articles

A New Prediction Model for Peak Shear Strength of Rock Joints Considering the 3D Morphology Parameters

WANG Shu-hong, YIN Hong, ZHANG Ze, WEI Wei   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Revised:2020-03-03 Accepted:2020-03-03 Published:2021-11-19
  • Contact: WANG Shu-hong
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Abstract: The apparent dip angle and the distribution parameter are camprehensively analyzed to correct Grasselli’s 3D morphology parameters system as well as get a new prediction model reflecting the shear behavior of rock joints. The single-valued distribution function A*θ△* is used as the weight function to calculate the average apparent dip angle. By defining the relative distribution parameters C*, revealing the control function of distribution parameters on resisting shear. A new peak shear strength prediction model is proposed. Compared with Grasselli’s model, the prediction accuracy of the new model is better verified through 50 sets of published data. The physical and mathematical boundary of distribution parameter C is proposed, and the phenomenon that the value of C from experiments is not less than 1 is explained. The distribution law of apparent dip angle and the composition of initial dilatancy angle are summarized, and the Grasselli’s model is classified into a unified form.The new prediction model has concise parameters, clear physical meaning and mathematical definition, and reveal the shear mechanism of rock joints.

Key words: rock mechanic; rock joint; 3D morphology; peak shear strength; distributed parameter

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