The document discusses mechanically stabilized earth (MSE), which uses reinforcing elements within layers of compacted soil to create a strong composite material. MSE walls generate confining pressure in the soil through tension in the reinforcement, which increases the soil's shear strength and allows earth structures to be built vertically rather than at the natural slope angle. Common applications of MSE walls include highway projects, where compacted soil layers are alternated with reinforcing elements like rebar or grids to form a retaining wall structure with a concrete facing.
Foundation Module 3rd-BCT301.pdf
Building Construction Technology Course and Equipment
Lecturer’s name: Saad Talaat BILBAS
University: Erbil Polytechnic University
College: Engineering
Department: Civil
Foundation Module 3rd-BCT301.pdf
Building Construction Technology Course and Equipment
Lecturer’s name: Saad Talaat BILBAS
University: Erbil Polytechnic University
College: Engineering
Department: Civil
This Assignment belongs to get a thorough knowledge of how to manage Construction Industry. Building Economic subject is most important for Quantity Surveyors, and here report was include with RIBA outline plan of work 2007 traditional procurement method, Construction cost method, Cost planning, Budget and post contract cost control method.
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8. Faculty of Engineering and the Built Environment
Analysis at a angle the failure plane – the
greater the failure plane the more the
vertical force contributes to shear stress and
the less it adds to shear strength
9. Faculty of Engineering and the Built Environment
If shear stress exceeds the strength
sliding occurs – material has failed:
10. Faculty of Engineering and the Built Environment
Granular materials cannot stand vertically –
the weight is enough to cause shear failure:
11. Faculty of Engineering and the Built Environment
Pore sand out on a table – the
pile forms a slope:
12. Faculty of Engineering and the Built Environment
Angle of the slope is called angle of repose – this is
the steepest angle at which the soil can naturally
rest – in other words this is slope at which the shear
stresses with in the soil due to its own weight are
exactly equal to the shear strength caused by
internal friction – any steeper and the soil will slide.
13. Faculty of Engineering and the Built Environment
Lets look at a sample of soil
and put in back into ground:
14. Faculty of Engineering and the Built Environment
Now the soil around our sample
can apply horizontal pressure:
15. Faculty of Engineering and the Built Environment
This is called confining pressure, and it
helps to balance out vertical forces like the
weight of the soil itself. This confining
pressure is the reason that granular material
can be stable at a slope, but usually won’t
be stable vertically.
16. Faculty of Engineering and the Built Environment
This can be a problem if you are trying to
build an earth structure for two reasons.
17. Faculty of Engineering and the Built Environment
1) It takes about twice as much material
than if you are using something that can
stand vertically.
18. Faculty of Engineering and the Built Environment
2) Space – in crowded cities, space is at a
premium. If you are building an eart
structure every meter you go up in height,
you have to go out that far as well, or even
further:
19. Faculty of Engineering and the Built Environment
So what’s a Geotechnical
Engineer to do?
• What if there was a way
to add confining pressure
to the soil, without having
to build on a slope.
20. Faculty of Engineering and the Built Environment
Answer - Reinforced earth!
Just like rebar in concrete, you
can create an incredibly strong
composite material with soil just
by adding reinforcing elements. A
wall created in this way is called
mechanically stabilized earth or
MSE.
21. Faculty of Engineering and the Built Environment
If you look closely, MSE
walls are everywhere:
25. Faculty of Engineering and the Built Environment
So what is
happening?
The tension in the
reinforcement is
generating
confining pressure
in the soil.
26. Faculty of Engineering and the Built Environment
This pressure
acts
perpendicularly to
the failure planes,
increasing the
shear strength:
27. Faculty of Engineering and the Built Environment
Building an MSE wall works exactly
the same way, and they are primarily
used in highway projects:
28. Faculty of Engineering and the Built Environment
Compacted soil is added in layers with
reinforcing elements in between each
layer:
29. Faculty of Engineering and the Built Environment
Most MSE walls ahs a facing of interlocked
concrete panels usually with some kind of
pattern, and these facing systems are what
make them so recognizable: