Abstract:During the process of grouting the marble dam foundation of the existing earth dam of Wanghuating reservoir,there were some unusual phenomena such as splitting dam body,splitting slots on dam crest,emitting grout from dam crest or dam gradient. That is a novel splitting grouting phenomenon. Considering that the grouting material was cement slurry,it influenced the character of existing earth dam after being congealed;people were worried about the new hidden dangers due to the grouting. This paper compared and analyzed the new derivative split grouting phenomenon with the Zhang¢s grouting method based on introducing the traditional derivative split grouting method. It is suggested to study the novel splitting grouting phenomenon such as the conjunction degree between calculus formed by the cement slurry which split the dam body and earth,the shape of the calculus,the transfiguration of calculus and dam body and earth,influence in the structural safety and seepage safety caused by calculus,and grouting theory and etc.. It will not only be benefit to the practical grouting but also promote development of grouting theory.