大部分碾压混凝土坝存在渗漏缺陷问题,在长期高水头作用下,渗漏易危及大坝安全. 江西山口岩碾压混凝土双曲拱坝最大坝高99.1 m,水库初期蓄水时发现浇筑层之间存在较严重的渗漏现象,通过对渗漏原因的分析,并结合防渗施工和水库用水要求,决定水面以上( 168 m高程)坝体采用新型环保防水材料聚脲进行喷涂,水下坝体采用搭接帷幕灌浆进行处理.防渗处理施工成后的渗漏量监测结果满足设计要求. 简要介绍了施工过程,其渗漏处理方案可以供同类工程参考.%Most RCC dams have seepage problems that would threaten the dam safety under long period of high water impound-ment. The largest height of Shankouyan RCC double-curvature dam, Jiangxi Province, is 99.1m, and there were severe pervi-ous problems at roller layers in initial impoundment process. By analyzing the seepage causes and in combination with demands of anti-seepage construction as well as the reservoir operation, we decided to carry out water-proof coating on the water-above dam surface with new environment-friendly material of polyurea, and to adopt overlapping curtain grouting to reinforce the un-derwater dam body. After the anti-seepage reinforcement, the monitoring shows that the seepage volume meets the related re-quirements. The construction process is presented, which could provide reference for similar anti-seepage reinforcements.
展开▼
