A stratum of soil consists of three layers of equal thickness. The permeability of top and bottom layers are k = 10^-4cm/s and that of middle layer is k = 10^-3 * cm / s, then the value of the horizontal coefficient of permeability kH for the entire soil layer is?

A stratum of soil consists of three layers of equal thickness. The permeability of top and bottom layers are k = 10^-4cm/s and that of middle layer is k = 10^-3 * cm / s, then the value of the horizontal coefficient of permeability kH for the entire soil layer is?

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.13P

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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.

Question

A stratum of soil consists of three layers of equal
thickness. The permeability of top and bottom
layers are k = 10^-4cm/s and that of middle layer
is k = 10^-3 * cm / s, then the value of the
horizontal coefficient of permeability kH for the
entire soil layer is?

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Th e void ratio of a clay sample is 0.5 an d the degree of saturatio n is 70%. Comput e the water content, dry and wet unit weights of the soil. Assume Gs= 2.7.