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采用3组具有不同表面形貌的节理试件分别在0.5,1.0,1.5,2.0,3.0 MPa的法向应力下进行直剪试验,研究常法向应力条件下峰值抗剪强度与节理表面三维形貌特征参数之间的定量关系。选用有效三维平均倾角3s、最大可能接触面积比A0作为表征节理三维形貌特征的参数;在分析剪胀角与法向应力关系的基础上基于试验结果提出双曲线形式的经验剪胀角模型,进而建立新的节理峰值抗剪强度公式。与Barton公式、Son公式进行了对比,在分析计算偏差的基础上对新公式做出简要评价。
Direct shear tests were carried out under three normal stresses of 0.5, 1.0, 1.5, 2.0 and 3.0 MPa respectively using three joint specimens with different surface topographies. The relationship between the peak shear strength and the three-dimensional The quantitative relationship between the appearance parameters. Based on the analysis of the relationship between dilatancy angle and normal stress, a hyperbolic model of empirical dilatancy angle model is proposed based on the experimental results. Based on the experimental results, Then a new joint peak shear strength formula is established. Compared with Barton formula and Son formula, the new formula is briefly evaluated on the basis of analyzing and calculating the deviation.