Verification of determination of hydraulic conductivity for coarse soils by empirical formulas based on the density index

Krystyna Jaśkiewicz,Tomasz Godlewski

doi:10.22630/aspa.2021.20.2.17

Abstract

Verification of determination of hydraulic conductivity for coarse soils by empirical formulas based on the density index

Highlights

The soil filtration properties are very important in the engineering-geological, geotechnical and hydrogeological assessment of the site
Laboratory methods were used to evaluate the hydraulic conductivity (k), which is a basic hydrogeological parameter determining the ability of soil to transport water, and confronted with the values obtained from empirical formulas for soils characterized by four different density indexes
The results of the filtration coefficient calculations based on empirical formulae are inaccurate and highly differentiated, which undermines their reliability and excludes the possibility of using this method in well-understood engineering practice

Summary

Introduction

The soil filtration properties are very important in the engineering-geological, geotechnical and hydrogeological assessment of the site. The hydraulic conductivity (k) is a parameter which defines the ability of the soil medium to transport water in it. It depends on such soil characteristics as: graining, porosity, mineral composition, moisture, shape and surface texture of particle, temperature of water (Wiłun, 1982; Head & Epps, 2011; Zięba, 2016; Jiang et al, 2021). The correct determination of the hydraulic conductivity becomes important when assessing the filtration conditions in the areas of hydrotechnical structures, open-pit mine drainage, as well as the stability of slopes. An increasingly serious problem during construction of excavations (below the groundwater table) is drainage of the construction site. Due to the limitations of environmental decisions, the inflow of groundwater into the excavation should be estimated in detail, and the optimal method of drainage should be selected

Objectives

Methods

Conclusion