Determining the Porosity and Saturated Hydraulic Conductivity of Binary Mixtures

Zhang, Z. F. ; Ward, Anderson L. ; Keller, Jason M.

Pacific Northwest National Laboratory (U.S.)

关键词: Sediments;    Hydraulic Properties;    Hydraulics;    Gravel Impact;    Porosity;   

DOI  :  10.2172/1016457
RP-ID  :  PNNL-18801
RP-ID  :  AC05-76RL01830
RP-ID  :  1016457

美国|英语

来源: UNT Digital Library

【 摘 要 】

Gravels and coarse sands make up significant portions of some environmentally important sediments, while the hydraulic properties of the sediments are typically obtained in the laboratory using only the fine fraction (e.g., <2 mm or 4.75 mm). Researchers have found that the content of gravel has significant impacts on the hydraulic properties of the bulk soils. Laboratory experiments were conducted to measure the porosity and the saturated hydraulic conductivity of binary mixtures with different fractions of coarse and fine components. We proposed a mixing-coefficient model to estimate the porosity and a power-averaging method to determine the effective particle diameter and further to predict the saturated hydraulic conductivity of binary mixtures. The proposed methods could well estimate the porosity and saturated hydraulic conductivity of the binary mixtures for the full range of gravel contents and was successfully applied to two data sets in the literature.