High-mountain narrow-valley arch dam foundation segmented and staged grouting method

The invention relates to a high-mountain narrow-valley arch dam foundation segmented and staged grouting method, and belongs to a foundation treatment method of a rock surface of a high steep bank slope foundation of a high-mountain narrow-valley arch dam foundation. The high-mountain narrow-valley arch dam foundation segmented and staged grouting method comprises the following steps: carrying out consolidation grouting and drilling after acceptance of excavation of the arch dam foundation; carrying out first-stage consolidation on the inside of a consolidation grouting hole; drilling a residual contact segment by the distance of 1 m with a phi 75 mm drilling sleeve after first-stage consolidation grouting is finished; burying a grouting system; pouring dam body concrete after first-stage consolidation grouting is finished; after joint grouting of a dam body is finished or while joint grouting of the dam body is carried out, carrying out second-stage consolidation on a consolidation grouting contact segment of the dam foundation. Consolidation of a bed rock contact segment and contact grouting are combined together, meanwhile, effects of contact segment consolidation and contact grouting are achieved, the work amount of the contact grouting system is reduced, the construction period is shortened, a construction technology is simplified, foundation treatment purposes of a high steep bank slope of the dam foundation of simplicity and convenience in construction, reliable technology, economy and reasonableness of grouting treatment of the high steep bank slope are achieved, and the problems encountered in foundation treatment of a dam segment of a bank slope are solved.