水布垭水电站左岸防淘墙竖井法施工关键技术

水布垭水电站防淘墙施工采用竖井法分层开挖、分层浇筑逆作法施工方案，该方案是复杂地层中水下防淘墙施工的一次大胆尝试和成功突破。施工中应用多项关键技术，解决了一系列施工难题。应用打“活套管”技术，解决了深厚覆盖层固结防渗的难题，节约了成本；应用控制爆破技术，避免爆破振动对紧贴新浇筑混凝土的损伤及对滑坡体稳定的影响；应用混凝土向下泵送技术，解决48m高落差混凝土浇筑难题；并首次应用“大竖井”代替“小竖井”方案，成功解决了深厚覆盖层（最深25．7m）中防淘墙施工的难题。该项目比合同工期提前4个月完成施工任务，创造直接经济效益676．89万元，为水布垭水电站提前发电做出了重大贡献，也为今后同类地质条件下防淘墙施工提供借鉴。

Key technology for construction of anti-scour wall by shaft method on the left bank of Shuibuya hydropower station

Reverse construction option is applied for construction of the anti-scour wall of Shuibuya hydropower station by shaft method,according to it,the anti-scour wall was excavated and placed in layers.The option proves that the underwater construction of the anti-scour wall is a bold attempt and successful breakthrough.Some key technologies are used during construction to deal with a series of challenges.By applying the "movable sleeve" technology,the problem of consolidation and seepage control of deep overbur...