施工期垫层料的压实性及渗流稳定性复核试验研究

Checking test on compactness and seepage stability of cushion materials at construction period

结合某水电站面板堆石坝现场检测成果，通过符合现场碾压工况的表面激振压实及高压渗变试验，论证了所提供垫层料压实控制密度的合理性及垫层料在高水头作用下的抗渗稳定性。垫层料在有反滤保护条件下，渗透坡降高达200～250未见破坏，具有较高的抗渗稳定性，但从防渗角度考虑，垫层料渗透系数偏大。由于试验级配比现场检测值偏粗，制样干密度又为垫层料现场检测的下限值，所得室内试验成果较现场偏于安全。

The article demonstrates rationality of control compactness density of the cushion material and antiseepage stability under high water head through surface compactness and high pressure seepage test conforming to site conditions combined with site test result of faced slab rockfill dam of one hydropower station. The cushion materials have seepage falling gradient as high as 200～250 under the protection of filter and it has higher anti-seepage stability. When anti-seepage function is considered, it seepage coefficient is greater. Because test gradation ratio is on the high side than site test value, dry intensity of sample is on the low side than site test value, the indoor test result is safety compared with site conditions.