Determining the Porosity and Saturated Hydraulic Conductivity of Binary Mixtures

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

关键词: BINARY MIXTURES;    HYDRAULIC CONDUCTIVITY;    HYDRAULICS;    POROSITY;    SEDIMENTS;    SOILS Gravel Impact;    Hydraulic Properties;    Vadose Zone;   

DOI  :  10.2172/1016457
RP-ID  :  PNNL-18801
PID  :  OSTI ID: 1016457
Others  :  Other: 830403000
Others  :  TRN: US201112%%428

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 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.