察汗乌苏面板堆石坝垫层料的生产及渗透特性研究

Preparation of cushion layer material for Chahanwusu Concrete Faced Rock-fill Dam and study on related seepage characteristics

察汗乌苏水电站水库大坝为目前在建的河床趾板建在深厚覆盖层上国内首座百米级的混凝土面板堆石坝。大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。为掌握其特性,进行了颗粒级配分析、渗透和渗透变形等项试验,研究解决了以天然砂砾料为主的垫层料的水力学指标问题,满足了工程需要,可为类似工程应用提供参考。

The dam for Chahanwusu Hydropower Station is the first one among the concrete faced rock-fill dams under construction with the height of over 100 m and the toe slab being constructed on thick and deep cover in China. The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand. In order to know the characteristics of the material, analysis on the particle gradation and the related tests on seepage and seepage deformation are made, with which the problems related to the cushion layer material mainly composed of the natural sandy gravel are solved, and the construction demand is met as well, which can provide a reference for the other similar project.