溶洞精确探测研究及在引子渡水电站厂房基坑溶洞堵漏中的应用

Cavern accurately-detecting research & application on plugging in cavern under powerhouse foundation ditch of Yinzidu Hydropower Station

地下溶洞的精确探测研究成果在贵州乌江引子渡水电站厂房基坑的溶洞涌水及堵漏处理的成功应用 ,表明对大漏量、高流速涌水溶洞的精确探测及堵漏处理 ,已取得了新的进展。该水电站厂房基坑溶洞涌水量达170 0～ 2 70 0m3 /h ,流速为 0 94～ 1 5m/s ,由于精确探测出了涌水溶洞的位置、规模及充填情况 ,针对其涌水量大、流速快的特点 ,采用模袋灌浆、控制灌浆工艺进行封堵处理后 ,溶洞涌水被完全堵住 ,从而保证了厂房基坑开挖的顺利进行。

The result of underground cavern accurately detecting research has successfully applied in Guizhou Yinzidu Hydropower Station for seepage detection in foundation ditch of powerhouse and plugging treatment. This indicates that accurately detecting and plugging treatment of cavern with high speed outgush have made considerable headway. The quantity of gush water in the foundation ditch was up to 1 700～2 700 m 3/s with a speed of 0 94～1 5m/s, the accurate location, scale and filing situation of the cavern with outgush were detected by the method, therefore, some measures can be taken such as form sack grouting, controlled grouting in the light of outgush's features, in resulting of completely plugging the cavern, and ensuing that the excavation of the foundation ditch could be smoothly carried out.