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深切Ｕ型峡谷区由水平或近水平坚硬岩组成，次生结构面的发育有其特殊性。从万家寨水利枢纽技施初期灌浆试验的过程及效果与岩体结构的关系，分析研究工程区特有地质条件，找出对灌浆起控制作用的地质因素。
Deep U-shaped gorge area by the horizontal or near-level hard rock composition, the development of secondary structural surface has its own particularity. From the process of initial grouting test and the relationship between effect and rock mass structure in Wanjiazhai Water Control Project, the geological conditions of engineering area are analyzed to find the geological factors that play a controlling role in grouting.