连续级配碎砾石粗细颗粒区分粒径分析

Analysis on Distinguished Particle Size of Coarse and Fine Crushed-gravel Material with Continuous Gradation

粗细颗粒区分粒径是连续级配碎砾石细粒含量判别法判别渗透变形类型重要指标,但目前为止,粗细颗粒区分粒径确定方法和量值均不一致,为验证2个典型方法及量值的适宜性和符合性,统计分析了45个工程179个试样的渗透变形试验结果,结果表明,定值法中以2 mm作为粗细颗粒区分粒径时,其渗透变形类型判断结果与试验结果符合率达80.7%,远高于变值法中以(d_(70)d_(10))^(1/2)为区分粒径时的符合率54.2%。推荐以2 mm作为不均匀连续级配碎砾石粗细颗粒区分粒径。

The distinguished particle size of coarse and fine gravels is an important index for judging the type of seepage deformation with the fine content discrimination method for fine particles with continuous gradation. However, the method and values in determining the distinguished particle size of fine and coarse gravel materials are inconsistent so far. In order to test the suitability and conformity between 2 typical methods and values, the test results of seepage deformation of 179 samples taken from 45 projects test have been calculated and analyzed. The testing results indicate that when the 2mm distinguished particle size is taken in fixed value method, the coincidence rate between the judging result and testing result of seepage deformation type reaches 80.7%, which is 54.2% higher than that used in variable value method taking √d70d10 as the particle size. Therefore, 2mm is recommended as the distinguished particle size of coarse and fine gravel material with non-uniform continuous gradation.