Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939



Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

Redo Problem 16.9 with the following: density of soil above the ground water table, ρ = 1800 kg/m3; saturated soil density below the groundwater table, ρsat = 2050 kg/m3; c′ = 36 kN/m3, ϕ = 29 ° , Df = 1.5 m, h = 1.5 m, and B = 2 m.

16.9 A square footing is shown in Figure 16.18. Determine the gross allowable load, Qall, that the footing can carry. Use Terzaghi’s equation for general shear failure (Fs = 4). Given: γ = 17 kN/m3, γsat = 19.2 kN/m3, c′ = 32 kN/m3, ϕ = 26 ° , Df = 1 m, h = 0.5 m, and B = 1.5 m.


Figure 16.18

To determine

Find the gross allowable load (Qall) that the footing can carry.


Given information:

The factor of safety is 4.0.

The density of soil above the ground water table ρ is 1,800kg/m3.

The saturated density of the soil ρsat is 2,050kg/m3.

The value of cohesion c is 36kN/m2.

The soil friction angle ϕ is 29°.

The depth of foundation Df is 1.5 m.

The depth of soil above water table h is 1.5 m.

The width of footing B is 2 m.


Determine the unit weight of soil above the water table γ using the relation.


Here, g is the acceleration due to gravity.

Substitute 1,800kg/m3 for ρ and 9.81m/s2 for g.


Determine the saturated unit weight of soil γsat using the relation.


Substitute 2,050kg/m3 for ρsat and 9.81m/s2 for g.


Determine the effective unit weight of soil γ using the relation.


Here, γw is the unit weight of water.

Take unit weight of water as 9.81kN/m3.

Substitute 20.11kN/m3 for γsat and 9.81kN/m3 for γw.


The ground water table is at the foundation level

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Engineering Solutions

Find more solutions based on key concepts

Show solutions add

Estimate the amount of electricity that is projected to be generated from natural gas in 2024.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

Define supply chain management (SCM).

Principles of Information Systems (MindTap Course List)

How would you define artificial intelligence?

Fundamentals of Information Systems

Define drilling.

Precision Machining Technology (MindTap Course List)

How can security be both a project and a process?

Management Of Information Security

What is the last weld bead on a multipass weld called?

Welding: Principles and Applications (MindTap Course List)

Careers and Employment It is a good idea to acquire information before graduation about the industry in which y...

Enhanced Discovering Computers 2017 (Shelly Cashman Series) (MindTap Course List)