The result of falling head permeability test for clay sample having an area of 1500 mm² and a length of 150 mm are as follows: At t=0 min, head difference= 350 mm At t= 4 min, head difference= 150 mm Find the coefficient of permeability of the soil if the area of stand pipe is 75 mm².

The result of falling head permeability test for clay sample having an area of 1500 mm² and a length of 150 mm are as follows: At t=0 min, head difference= 350 mm At t= 4 min, head difference= 150 mm Find the coefficient of permeability of the soil if the area of stand pipe is 75 mm².

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.

Question

The result of falling head permeability test for clay sample having an area of
1500 mm² and a length of 150 mm are as follows:
At t=0 min, head difference- 350 mm
At t= 4 min, head difference- 150 mm
Find the coefficient of permeability of the soil if the area of stand pipe is
75 mm².

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