混凝土坝施工期或运行期常出现不同程度的裂缝，灌浆作为修补混凝土裂缝的一项主要技术，能显著提高坝体整体性和承载力。结合国内外混凝土坝裂缝灌浆修补的工程实例，对灌浆技术的应用进行阐述，并对其中几个关键技术问题：灌浆时机的选择、灌浆压力的合理取值及灌浆效果评价方法等进行了探讨。

Cracking is a common phenomenon in the construction or operation period of concrete dams due to the low tensile strength of concrete. Grouting is considered to be an effective approach to repair the concrete crack, which can reinstate the integrity and bearing capacity of the dam. The stresses of concrete dam are redistributed by cracks before grouting； the effect of solid-fluid coupling exists between the concrete and the grouting material, and excessive grouting pressure easily leads to crack propagation during grouting； the new state of stress appears as the grout sets, so the effect of the grouting needs to be reasonably evaluated. In this paper, the application achievements of grouting in reparing cracks of concrete dams were reviewed. Then, some problems concerned were discussed, such as the grouting opportunity, the maximum grouting pressure to avoid hydro-fracturing, and the reasonable evaluation method of grouting effect in the repaired dam.