用断裂力学方法分析大体积混凝土坝的裂缝问题,需要知道裂缝端部的应力强度因子和混凝土材料的断裂韧度,前者可以通过数值分析法或结构试验法求得,而混凝土断裂韧度的确定由于涉及混凝土的断裂机理等问题,尚值得研究。近年来,国内外许多学者对混凝土缝端区的物理状态和数学模型作了不少研究,提出不同的观点,主要有以下2种计算模型: Fracture mechanics analysis of large concrete dam cracks need to know the stress intensity factor at the crack tip and the fracture toughness of concrete materials, the former can be obtained by numerical analysis or structural test method, and the determination of the fracture toughness of concrete Due to the fracture mechanism involving concrete and other issues, it is worth studying. In recent years, many scholars at home and abroad made a lot of research on the physical state and mathematical model of concrete seam end area, put forward different viewpoints, mainly including the following two kinds of calculation models: