水工地下隧洞混凝土衬砌渗水裂缝处理探析

On the Treatment of Seepage Crack of Concrete Lining of Hydraulic Underground Tunnel Concrete Lining

对水工地下隧洞进行混凝土浇筑时,由于各种因素的影响,容易导致内外温差较大,可能会引起混凝土温度应力,使混凝土出现不均匀收缩,导致产生裂缝现象。当有较高的地下水位时,隧洞可能会在垂直水流的方向的环向出现水压渗水裂缝,长时间渗水将会严重威胁隧洞的安全。可采用打斜孔埋管和无损贴嘴灌浆来处理隧洞的裂缝,从实践的效果看,两种裂缝处理技术的效果一般能够满足设计的质量要求。

When concrete is poured for the underground tunnel, due to the influence of various factors, it is easy to cause the temperature difference between inside and outside of the tunnel, which may cause the concrete temperature stress, causing the concrete shrinks, so as to lead to the phenomenon of cracks. When there is a high groundwater level, it is likely to have cracks caused by water pressure in the direction of vertical flow of water. And longtime seepage will pose a serious threat to the safety of the tunnel. The methods of burying pipe in slant holes and lossless post grouting nozzle can be used to deal with the tunnel cracks, and from the practical effect, these two kinds of cracks processing techniques can generally meet the requirements of the quality of design.