乐滩水电站10号坝的快速堵漏新工艺

New Fechnique for Fast Blocking up the Seepage of 10# Dam in the Letan Hydropower Station

乐滩水电站10号坝上游围堰基岩溶槽、夹层、裂隙发育,挡水水头10.0 m,漏水量约为0.9 m3/s。由于10号坝施工场地极有限,无场地安装抽水设备,工期只有75 d,防渗成败,直接影响工期目标。设计布置了两排帷幕防渗。经过灌注混凝土、水泥膏浆等,快速堵住了漏水通道,达到了较好的防渗效果,确保了工期。

The dissolved channels, interbeds and fissures are developed in the upper-reach cofferdam of 10# dam in the Letan hydropower station, the difference in height between the upper-and lower-reach water levels is 10.0 m, and the water seepage is about 0.9 m^3/s. Because there is extremely limited site on 10# dam for construction, and there is no room to install pump facilities and the time limit for the project is only 75 days, whether the seepage is blocked up or not will affect the construction objectives. The seepage channels are fast blocked up through grouting concrete and cement mortar. This technique reaches the better anti-seepage effects and ensures the time limit for the project.