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提出了测定Ⅰ－Ⅱ复合型裂缝断裂能的方法，用试验论证了不同组合Ⅰ－Ⅱ复合型试件的断裂能属同一量级；对不同应力强度因子水平的试件进行了碾压混凝土层面的徐变断裂试验，得到了应力强度因子水平与断裂时间的关系。
The method to determine the fracture energy of composite Ⅰ-Ⅱ fracture is proposed. The experimental results show that the fracture energy of complex Ⅰ-Ⅱ composite specimens belong to the same order of magnitude. The specimens with different stress intensity factors are tested by RCC Creep rupture test, the relationship between stress intensity factor and rupture time is obtained.