A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10^–4 cm/s, 52 × 10^–4 cm/s, and 6 × 10^–4 cm/s,and their thicknesses are 7, 3 and 10 m respectively. Find the effective average permeability in mm/s of the deposit in the horizontal direction. a. 15.9 x 10^-3 b. 8.9 x 10^-3 c. 7.7 x 10^-3 d. 13.6 x 10^-3

A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10^–4 cm/s, 52 × 10^–4 cm/s, and 6 × 10^–4 cm/s,and their thicknesses are 7, 3 and 10 m respectively. Find the effective average permeability in mm/s of the deposit in the horizontal direction. a. 15.9 x 10^-3 b. 8.9 x 10^-3 c. 7.7 x 10^-3 d. 13.6 x 10^-3

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.15P

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Concept explainers

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

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a. 15.9 x 10^-3

b. 8.9 x 10^-3

c. 7.7 x 10^-3

d. 13.6 x 10^-3

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