用混凝土洞塞解决大坝坝肩软弱面的滑动问题

Treatment of the Sliding along the Plane of Weakness at Abutment By Placing Concrete Plug

后河水库工程两岸坝肩底部存在着地质软弱面和缓倾角结构面,由抗滑稳定计算表明,该软弱结构面影响着坝肩稳定,必须进行地基处理。经多种处理方案比较,选用混凝土洞塞来置换一定范围的地质软弱面。详细论述了采用该技术的原因、洞塞的布置、开挖、回填和施工质量检测等。各种数据说明:洞塞的施工质量可靠、有效地解决了坝肩滑动问题。

The geological weak plane and the low dip angle structure plane occur in the dam abutments at both banks in Houhe reservoir project and their effects on dam stability have been proved by slidingresistance calculation. It is concluded that foundation treatment is necessary for dam safety. Placing concrete plug on site to substitute the weak plane is adopted after comparing several treatment schemes. This paper presents the reasons for taking this measures, layout of concrete plug, excavation, backfilling and inspection of construction quality. All the data show that the construction quality is reliable enough to effectively prevent the sliding of dam abutments. 