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引入3个在一定范围内独立于测量尺度的三维形貌参数表征岩石节理形貌,并基于形貌参数建立了新的岩石节理峰值剪切强度准则。同时采用新准则和Barton公式计算了23对岩石节理的峰值剪切强度并与室内直剪试验结果对比,新准则的计算值与试验结果较为接近而Barton公式在一定程度上低估了节理剪切强度,表明新准则能更好地描述节理峰值剪切强度。新准则的三维形貌参数反映了不同形貌特征对剪切强度的贡献,物理意义明确,并且形貌参数可在一定范围内采用任意尺度测量,因而有利于新准则的工程应用。进一步分析表明:在规则齿形节理情况下,新准则可退化到Patton公式的形式,因而新准则实质是Patton公式的三维推广。
Three new three-dimensional topographical parameters independent of the measurement scale were introduced to characterize the rock joint morphology. Based on the topographic parameters, a new criterion of peak shear strength of the rock joints was established. The new shear strength of 23 joints was calculated by the new criterion and Barton’s formula. Compared with the results of the direct shear test, the calculated value of the new criterion is close to the experimental result. The Barton’s formula underestimates the joint shear strength , Indicating that the new criterion can better describe the joint peak shear strength. The new three-dimensional topography parameters reflect the contribution of different topographic features to the shear strength, the physical meaning is clear, and the topographic parameters can be measured at any scale within a certain range, thus contributing to the engineering application of the new criterion. Further analysis shows that in the case of regular tooth joints, the new criterion can degenerate into the form of Patton’s formula, so the new criterion is the three-dimensional generalization of Patton’s formula.