1. An-Najah National University Engineering College
Civil Engineering Department

2. Design of Foundation for Nablus Industrial School""
Submitted by Sameh Jamal Zalmout
Supervisor Dr. Sami Hijjawi

3. Introduction to Foundation
A foundation is a structure that transfers loads to the earth. Foundations are generally broken into two categories

4. Types of Foundations
1- Shallow Foundation
2- Deep Foundation

5. Shallow Foundation
1- Spread Footing
2- Mat Slab
3- Slab on grade

6. 1-Pile foundation systems
Deep Foundation
1-Pile foundation systems
2-Pier and grade beam foundation
3-Specialty piles

7. Specialty Piles
1-Micropiles
2-Tripod piles
3-Sheet piles
4-Soldier piles

8. 5-Suction Piles
6-Vibro Stone Columns
7-Piled walls
8-Pipe piles

9. 9-Pre-stressed concrete piles
10-Cylinder Piles, (hollow concrete piles)
11-Timber Piles
12-Screw Piles
13-Platform on Piles

10. Project Description and Geotechnical Investigation

11. - The school consists 4 stories
- Plan construction area square meter in the first and second basement, and 902 square meter in the ground and first floors

12. - The studied area is flat
- The soil is high plastic silty clay layer
-No ground water within the depth of the borehole
- 6 boreholes

13. 4.7 Bearing capacity (kg/cm2) (t/m3) Ø C (KN/m2) L (m) B Depth Soil
type
Elevation
1.6 6 10 36
2.0
3.0
Silty Clay (CH)
104.5
(BH.1-4)
1.8 20 33
Marl
102.0
(BH.4)
2.5 21 12
Marl+gravel
106.0
(BH.1-6)
1.7 30
4.0
Silty clay
(CH)
103.0
(BH.3-2-5)
4.7 18 23 9
5.5
99.0

14. Gravity loads divided into 2 types;
Structural Analysis
Gravity loads divided into 2 types;
Dead Load (D.L)
Live Load (L.L)
Service load=1.2 D.L+1.6 L.L

15. D.L= Area (around column)*Slab thickness*Density of the concrete
Thickness of slab =0.4 meter
Density of the concrete =2500 Kg/m³
L.L= 600 Kg/m³

16. Mat Foundation
Mat foundation is a combined footing that may cover the entire area under a structure supporting several columns and walls
Mat foundations are sometimes preferred for soil that have low bearing capacity

17. The project consists of two symmetrical mat foundation
The following figure shows the mat foundation (using sap2000 version 12)

19. Mat depth= 0.75 meter
َFc =280 kg/cm²
Fy = 4200 kg/cm²
Column height = 3.5 meter.

20. Pile Foundation
Piles are long and slender members which transfer the load to deeper soil or rock of high bearing capacity avoiding shallow soil of low bearing capacity

21. Single Pile
The ultimate load can be carried is equal to the sum of ultimate resistance of the base of the pile and the ultimate skin friction over the embedded shaft of the pile

22. Q allowable =
Qp= qp*Ap
qp = Nc * Cu
Qs= (∑ (F*Cu*P))*ΔL

23. All piles used in this project was (0. 7,0
All piles used in this project was (0.7,0.8) meters diameter with several lenghts
Total number of piles
105 piles

24. Se (1) = elastic settlement.
Settlement of piles
Se = Se (1) +Se (2) + Se (3)
Se (1) = elastic settlement.
Se (2) = elastic settlement due to load at pile tip.
Se (3) = elastic settlement due to skin friction (shaft)

25. Pile Caps
Pile Cap is defined as a concrete block cast on the head of a pile to transmit the load from the structure to the pile or group of piles.

26. According to the nature and characteristics of the materials encountered in the drilled boreholes (Fill materials with well defined layers of high swelling silty clay at a shallow depth followed by marlstone and occasionally boulders),

27. as well as the low soil bearing capacity, I suggest to consider the design of pile foundations for the building to reduce or avoid the detrimental effects of soil volume change (swelling and shrinkage) along the bored depth of the boreholes

28. Thank You