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节理的峰值剪切强度受表面三维形貌和材料力学属性的影响,已有的文献着重阐述形貌参数的重要性。总结分析了材料的抗拉强度对节理剪切力学性质的影响。采用最大可能接触面积比、最大视倾角、视倾角分布参数描述节理沿剪切方向的三维形貌特征,用双曲线函数描述不同法向应力下的剪胀角,提出新的剪切强度准则,计算值与试验值保持了较好的一致性。采用其中28组岩石节理的直剪试验数据对新准则与JRC-JCS准则进行了比较,结果表明JRC-JCS准则的计算值与试验值相比差异更大。新准则采用的形貌参通过由形貌测试确定,避免了主观因素对形貌参数取值的影响,可用用于估算岩石节理的峰值剪切强度。
The peak shear strength of the joints is affected by the three-dimensional topography and the mechanical properties of the materials. The existing literature focuses on the importance of the topographic parameters. The influence of the tensile strength of the material on the mechanical properties of the joint was analyzed. The maximum possible contact area ratio, the maximum apparent dip angle and the apparent dip angle distribution parameter are used to describe the three-dimensional topographic features along the shear direction. Hyperbolic functions are used to describe the dilatancy angles under different normal stresses. A new shear strength criterion is proposed, The calculated values are in good agreement with the experimental values. Using the direct shear test data of 28 sets of rock joints, the new criterion and the JRC-JCS criterion are compared. The results show that the calculated value of JRC-JCS criterion is more different from the experimental value. The topographic parameters used in the new criterion are determined by the morphology test to avoid the influence of the subjective factors on the value of the morphology parameters and can be used to estimate the peak shear strength of the rock joints.