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采用人工模拟材料制备节理试件,分别在0.5、1.0、2.0、3.0 MPa法向应力下进行直剪试验,每级法向应力下剪切4次,模拟剪切变形历史对剪切强度的影响。试验结果表明:峰值强度随剪切次数的增加逐步减少,第1次直剪试验得到的峰值剪切强度与第2次直剪试验得到的峰值剪切强度差异最明显,之后随剪切次数的增加,峰值剪切强度变化较少。通过分析不同法向应力下节理的剪胀特征及峰值剪切强度的变化,建立了考虑剪切变形历史(以剪切次序表达)影响的峰值剪切强度准则。
The artificial specimens were used to prepare joint specimens. The specimens were subjected to direct shear tests at normal stresses of 0.5, 1.0, 2.0 and 3.0 MPa, respectively, and the shear stress was normalized four times at each stage. The influence of the shear deformation history on the shear strength . The experimental results show that the peak intensity decreases with the increase of shear frequency, the difference between the peak shear strength obtained from the first direct shear test and the peak shear strength obtained from the second direct shear test is the most obvious. After that, Increase, less change in peak shear strength. By analyzing the dilatancy characteristics and peak shear strength of joints under different normal stresses, a criterion of peak shear strength considering the influence of shear deformation history (expressed in shear order) is established.