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针对纯剪断裂试件存在的问题，提出了采用压剪试件实现岩石Ⅱ型裂纹剪切断裂并测试岩石剪切断裂韧度的实验方法，并通过对压剪试件的应力分布和测试结果的分析讨论，提出了岩石Ⅱ型断裂韧度实验的最佳方案，并进而讨论了Ⅱ型裂纹的两种不同断裂型式和断裂判据。
In order to solve the existing problems of pure shear fracture specimens, a method of compressive shear specimen for shear fracture of rock type Ⅱ crack and test of rock shear fracture toughness was put forward. Through the stress distribution and test results , The best scheme of rock II fracture toughness experiment is put forward, and then two different fracture types and fracture criteria of type Ⅱ crack are discussed.