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根据碾压混凝土拱坝诱导缝的构造特点，利用大比尺楔入劈拉试验成果，将诱导缝在稳定扩展中断裂过程区应力分布与相应的变形（张开度ω）联系起来，建立了诱导缝的等效裂纹断裂模型。利用等效裂纹断裂模型，计算了某碾压混凝土拱坝诱导缝的等效强度．结果表明，等效强度可以作为诱导缝的开裂准则。
According to the structural characteristics of the induced joints of RCC arch dam and the results of splitting tensile tests by large-scale wedging, the stress distribution in the process of fracture propagation in induced joints is related to the corresponding deformation (opening degree ω), and the induced joints Equivalent crack fracture model. Equivalent crack rupture model is used to calculate the equivalent strength of induced fracture of a certain RCC arch dam. The results show that the equivalent strength can be used as the guide crack initiation criterion.