This presentation includes case studies about deep excavation in Egypt and outside Egypt, useful for civil students and specially soil students who is interested in deep excavation.

1. Ahmed Bahaa El Din Aly 15P1012
Abdallah Shaheen Mohamed 15P1003
Seif Ahmed Mohamed 15P1022
Islam Mohamed El Sayed 15P1023
Nael Hesham Ahmed 15P6015
Mohamed Karam Sayad 15P5002
Ahmed Essam Ali 15P1051
Youssef Ehab Salah 15P1041
Dr. Amgad Talaat
Submitted by:
Submitted to:

2. Retaining Wall

3. New headquarters of New
Cairo City’s Authority

5. Case Study
 Grade earth.
 Excavate to level -3m for Guide walls.
 Construct Formworks of Guide walls.
 Pour concrete of Guide walls.
 Drill &Pour concrete of piles
 Excavate to level -9m.
 Insert Anchors.
 Fix Waller beams.
 Fix boxes of anchors.
 Test anchors tensile strength.
 Backfill & compact by sand outside Ret. Walls at level -9.6m.
 Backfill & compact by sand outside Ret. Walls at level -6.4m.
 Backfill & compact by sand outside Ret. Walls at level -3.2m.

6. Procedures
 Making a slope 1:1
 CFA piles (360 piles)
 Technique of installing CFA piles
 Piles drilling machine drills for piles holes
into guide walls.
 Concrete is poured
 Reinforcement of piles is inserted.

8.  Piles are covered with
metal net sheets.

9.  Cover the piles and metal sheets
with mortar.

10.  Tie beams are used to connect the piles in
order to work together .

11.  Anchors
 Anchors are put every 3 Piles to connect between piles and
retaining walls and to prevent the overturning of the piles.

12.  Advantages
 Minimal levels of vibration
 Lower noise levels generated by piling rig
 Faster installation
 More suitable for tension loads at stability elements
depending on ability to install cage prior to concrete drying
out.
 Much higher load capacities on larger diameter piles

13.  Dis Advantages
 Longer piles required than driven (not driven to a
predetermined set).
 Removal and disposal of spoil material generated from the
pile.
 Drilling through large obstructions/boulders cannot be
undertaken.
 A strict quality control and thorough supervision need to be
done during the pile installation.

14. Soil Nailing

15. Soil Nailing
 Applications

16. TYPES OF NAILS USED
 Drilled and Grouted Soil Nail.
 Driven Soil Nails.

17. MATERIALS USED FOR SOIL NAILING
 Steel Reinforcements
 Grout Mix
 Shotcreting

18. Machines Used

19. Advantages
 Shotcrete facing is less costly
 Grouting only once is required, saving time and labor.
 The technique is flexible, easily modified.
 Less impact on nearby properties
 Can be used for strengthening of either natural slope, natural or
manmade
 Allow excellent working space in front of the excavation face,
Rapid and uses less construction materials

20. Disadvantages
 Soil nails may not be appropriate, where strict deformation control
is needed.
 Only a very experienced and specialized contractor can implement
this soil mail technique.
 Can Penetrate sewer or communication Lines.
 Not suitable for high level of underground water Lands.

21. Procedures

22. Diaphragm Walls

23. Construction Procedure

24. Advantages
 Can be installed through virtually all soil conditions, to any plan
geometry and to considerable depths.
 Can be constructed ahead of time and independent of other site
activities.
 Can be constructed in relatively low headroom and in areas of restricted
access walls can be quickly
 formed several hundred feet deepth good control over geometry and
 continuity.

25. Dis Advantages
 They are relatively costly.
 They are also unsuited to strong soils conditions where
penetration is slow and difficult due to the use of the slurry
trench method.
 Need high trained Labors and Quality Control

32. Soil Injection

41. Bracing in deep excavation
 RPSG Office building at Alipore, Kolkata
 It has 9.0m deep basement.
 Pile foundation was suggested.
 The project site was almost “T” shaped having
almost equal width in all three arms.
 which has restricted the possibility of
island/open excavation.

42. Bracing in deep excavation
 Presence of building at close vicinity of the
site also restricted the option of anchored
excavation
 The permissible deflection at top of
retaining wall was limited to 25-40mm only.
 Braced excavation has been proposed with
 steel sheet pile and three level struts.
 Vertical H post at
 few locations has been used to reduce the
strut section.

43. Bracing in deep excavation

44. Hydraulic Bracing in deep excavation