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本文采用最大尺寸为3.6×3.0×0.2m的巨型紧凑拉伸试件进行了混凝土断裂实验.发现当试件高度达到2m时,所测得的断裂韧度K_(IC)值与试件尺寸无关。因此线弹性断裂力学可以很好地应用于大体积混凝土结构的裂缝稳定性分析和改进水工结构的设计方法。研究结果表明,对于象高混凝土坝那样的大体积混凝土结构的I型裂缝评定问题,可以采用断裂韧度K_(IC)作为断裂准则。
In this paper, a concrete fracture experiment was carried out using a giant compact tensile specimen with a maximum size of 3.6×3.0×0.2m. It was found that when the height of the specimen reaches 2m, the measured fracture toughness K_(IC) value is independent of the specimen size. . Therefore, the linear elastic fracture mechanics can be applied to the crack stability analysis of large volume concrete structures and improve the design method of hydraulic structures. The results of the study indicate that fracture toughness K_(IC) can be used as fracture criteria for the evaluation of type I cracks in mass concrete structures such as high concrete dams.