采用高压单向压缩仪,对糯扎渡堆石坝的坝壳反滤料进行了不同相对密度的粗粒料湿化变形试验研究.分析试验结果,揭示了粗粒料在单向压缩条件下的湿化变形规律,探讨了不同干密度下粗粒料的湿化变形性质,发现湿化变形仅在高压下随粗粒料干密度的增大而增加,低压下干密度的影响不明显.另外,还分析了压力对湿化变形的影响,得出了湿化变形随竖向压力的增大而增加的规律,并用一指数函数进行了拟合.试验中,研究了一种减小侧壁摩擦力的方法,并通过是否减轻摩擦的对比试验,论证了方法的有效性.
By using high pressure axial compression apparatus, the wetting deformation behavior is studied for the filter material of Nuozadu rock-filled dam with different relative density. According to the result of tests, the disciplinarian of coarse-grained material wetting deformation is presented under axial compression condition, and the character of coarse-grained material wetting deformation with different dry density is discussed. The wetting deformation increases along with the dry density only in the high pressure case. The infection of the dry density is unconspicuous when the axial pressure is low. Impact of the pressure on wetting deformation is analyzed using the result. The wetting deformation increases follow the axial pressure. A new method is used to reduce the side frictional force in the tests, and the validity of this method is demonstrated through comparison tests.