3.7The following table gives the variation of the field standardpenetration number (N60) in a sand deposit. Depth (m)1.53.04.56.07.59.0N6051114181621The groundwater table is located at a depth of 12 m. The dryunit weight of sand from 0 to a depth of 12 m is 17.6 kN/m³.Assume that the mean grain size (D50) of the sand deposit isabout 0.8 mm. Estimate the variation of the relative densitywith depth for sand. Use Eq. (3.23).

water table located 12 m below surfacedry unit weight of sand (soil) depth upto 12 m = 17.6…

Answered: about 0.8 mm. Estimate the variation of…

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about 0.8 mm. Estimate the variation of the relative density with depth for sand. Use Eq. (3.23).

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.17P

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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

3.7
The following table gives the variation of the field standard
penetration number (N60) in a sand deposit.

Depth (m)
1.5
3.0
4.5
6.0
7.5
9.0
N60
5
11
14
18
16
21
The groundwater table is located at a depth of 12 m. The dry
unit weight of sand from 0 to a depth of 12 m is 17.6 kN/m³.
Assume that the mean grain size (D50) of the sand deposit is
about 0.8 mm. Estimate the variation of the relative density
with depth for sand. Use Eq. (3.23).

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Coarse sand and medium sand (assuming same mineralogical composition) will have the same particle density. True False
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Complete Answer
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