Correction of the Seepage Velocity of Soluble Contaminants in Sand with Different Particle Size Distribution

In order to investigate the influencing flow factors in the process of soluble contaminant transport and analyze the seepage velocity regularity of sand with different particle size distribution. This article made a series of indoor tests, in which single hole tracing method based on the dilution method was used to measure the seepage velocity of sand. Six kinds of different particle size distribution of sand were used as research objects. The tracer was placed in the observation hole in the sand to mark the water and simulate the migration of soluble pollutants. Divided into different particle size distribution of sand is primarily performed by coefficient of uniformity and coefficient of curvature. The results show that the logarithmically measured test data in the observation hole is linearly and negatively correlated with the time, and the percolation velocity increases linearly with the increase of the head. There are obvious and definite differences between the calculated seepage velocity and the measured seepage velocity of each sand sample. Considering that the difference is related to the basic properties of the sample, a correction coefficient c is introduced to correct the formula for calculating the seepage velocity in the single-hole tracing method.