土工膜面板软岩堆石高坝设计

Design of High Geomembrane Face Soft Rock Filled Dam

老挝南欧江六级水电站挡水建筑物为土工膜面板堆石坝,该坝为目前世界上最高的土工膜面板堆石坝,也是软岩填筑比例最大的面板堆石坝。坝体设计以现场碾压试验和室内试验进行的板岩堆石料物理力学特性研究为基础,进行坝体分区设计和调整,提出合理的坝料碾压填筑标准,结合土工膜柔性防渗体系设计,系统的建立土工膜面板软岩堆石高坝设计流程。经应力变形和渗流计算分析,坝体分区设计合理。蓄水后,监测数据表明坝体各项指标正常,坝体变形在允许范围内,土工膜防渗效果良好。

The retaining structure of Nam Ou 6 Hydropower Station in Laos is geomembrane face rockfill dam which is the highest one in the world at present and is also such dam project with maximum soft rock filling proportion. Based on the physical and mechanical property researches of slate rockfill material by means of in-situ compaction tests and lab tests, the zoning design and adjustment of dam body are conducted, and a suitable filling standard of rockfill material is proposed.Combined with flexible anti-seepage design system of geomembrane, a design procedure of high geomembrane face soft rock filled dam is also systematically established. The calculations of stress, deformation and seepage show that the dam zoning design is reasonable. The dam monitoring data after impoundment also show that the indicators are normal, the dam deformation is in allowable range and the geomembrane seepage control is good.