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虽然不同材料的界面裂缝缝端应力情况很复杂，但是在拉剪荷载作用下，仍然存在主 导缝端奇异特性的特征参数──应力强度因子，且其主导奇异项仍为１／２，因此可以采用１／４ 奇异边界单元模拟缝端的位移场和应力场。作者沿界面引用边界元，在界面裂缝周围引入１／４ 奇异边界元，给出了计算异弹模界面缝复应力强度因子的计算格式，定义了界面裂缝的等效能 量释放率，探讨了界面裂缝的断裂差别指标，并应用于混凝土坝与岩石地基的界面裂缝扩展分 析中，得到一些有关坝工安全的重要提示。
Although the stress at the crack tip is very complicated, the characteristic parameters of the singularity of the leading seam end still exist under the tensile load, and the dominant singularity is still 1/2, Using 1/4 singular boundary element to simulate the displacement field and stress field of the seam end. By introducing boundary element along the interface and introducing 1/4 bounded boundary element around the interface crack, the authors calculate the calculation formula of the complex stress intensity factor of different crack interface and define the equivalent energy release rate of interface crack. The interface Cracks in the fracture index, and applied to the expansion of the interface between concrete dams and rock foundations crack analysis, get some important tips on dam safety.