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

Abstract

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.

Description

technical field [0001] The invention belongs to a foundation treatment method for a high and steep bank slope bedrock surface of an arch dam foundation in a high mountain and a narrow valley. Background technique [0002] 80% of narrow valleys are located in sedimentary rock areas such as limestone, dolomite, and sand shale, and 60% of narrow valley arch dams are built in narrow valleys of limestone and dolomite. The bank slope of narrow valley arch dams is generally very steep, and the valley is completely V-shaped. Generally, narrow valleys are eroded, and the bank slope of narrow valleys is often 70-80°, and even an inverted slope within a certain height range. The valley bottom of narrow valley arch dams sometimes forms deep grooves due to rapid erosion. Such deep canyons are often prone to unloading relaxation along the slope, large slope deformation, and even potential collapse and landslides. In addition, due to the impact of blasting during construction, This requir...

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Problems solved by technology

[0004] The invention provides a staged grouting method for the dam foundation of an arch dam with high mountains and narrow valleys, so as to solve the serious interference between the consolidation grouting of the dam foundation with high and steep slopes of the arch dam with high mountains and narrow valleys and the concrete pouring of the dam body, increase the amount of concrete drilling work, and possibly damage the dam Internal cooling water pipes and safety monitoring of buried equipment affect the rising speed of the dam body and bring about potential hidden dangers of water seepage in horizontal construction joints

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