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本文以线弹性断裂力学观点,对重力坝上游面和坝踵水平裂缝进行了分析,研究表明:在重力坝上游存在一个允许水平裂缝区。坝踵产生裂缝及其扩展是坝的初始破坏形式。当库水位上升时,裂缝向基岩内扩展,应该用断裂力学方法校核裂缝的稳定性,并以此作为重力坝稳定的补充条件。文中通过石膏实验,研究了脆性材料的复合判据。最后对应用断裂力学研究重力坝裂缝问题提出几点意见。
In this paper, the horizontal cracks in the upstream face and the heel of the gravity dam are analyzed based on the linear elastic fracture mechanics. The results show that there is a horizontal fracture zone upstream of the gravity dam. Cracks in the heel and their expansion are the initial forms of dam damage. When the reservoir water level rises, the cracks expand into the bedrock. The fracture mechanics method should be used to check the stability of the fractures and use this as a supplement to the stability of the gravity dam. Through the experiment of gypsum, the composite criterion of brittle materials is studied. Finally, some suggestions are put forward on the application of fracture mechanics to the study of gravity dam cracks.