SCHEDULE FREE WEB DEMO

Pile Raft Case History - Review Options in DeepFND Software

A Pile Raft in Gdansk Poland, Redesigned with DeepFND Software

This document examines a case history of a pile raft, constructed in Gdansk, Poland. A liquid gas terminal was constructed over 2 rectangular pile caps (71 m x 61.2 m x 0.9 m thick), each one of them supported by 180 reinforced concrete bored piles (diameter: 1 m and 0.62 m, pile depth: 26.5 m).

A model of the pile raft was created with our DeepFND software program. This document presents the software input and calculation results, as well as, a comparison with the measured displacements and estimations of different methods. Some information and data that were not included in the case history, had to be assumed.

Study Case Pile Raft 1.JPG

Figure: Pile Layout for the Liquid Gas Terminal Pile Raft

A. SOIL PROPERTIES AND STRATIGRAPHY

The piles were embedded in sand and alluvium soil layers. The following Table summarizes the estimated soil properties for all soil types.

Table 1: Soil Properties and Soil Layers (Stratigraphy)

Soil Layer Top Elev.
(m)

Soil

(-)

Soil Type

(-)

Friction Angle
(deg)

Cohesion
(c’ or Su)
(kPa)

Total Unit Weight
(KN/m3)

Young’s Modulus
(kPa)

Poisson’s Ratio

(-)

5

1

Sand (Fill)

30

0

18

32000

0.35

2.9

2

Silty Sand

26

2.4

16

52000

0.45

-2.5

3

Soft Sand

28

0

17

9000

0.35

-7

4

Medium Sand

34

0

18

35000

0.35

-9.7

and -18

5

Medium Silt

28

14.5

19.6

32000

0.45

-11.9

And -23.6

6

Dense Clay (Undrained)

-

15

15

1300

0.45

-24

7

Sandy Clay (Undrained)

-

150

20

36000

0.32

 

B. PILE SECTION PROPERTIES AND PILE POSITIONS (LAYOUT)

In the original project, two types of piles where used:

- 1 m diameter reinforced concrete piles, distributed on the whole pile raft

- 0.62 m diameter reinforced concrete piles, used along the 3 raft sides

C: GENERATED MODEL - RESULT GRAPHS (DEEPFND)

Pile Raft Moments.png Pile Raft Uplift Pressures.png

Figure: Pile Cap Moment Diagram (Up) and Uplift Stresses Diagram (Down) - DeepFND

Study Case Pile Raft Settlements 3D Model DeepFND.JPG

Figure: Pile Cap Settlements Shadings (3D Model) - DeepFND

D: DEEPFND PILE RAFT SETTLEMENTS VS MEASURED AND PREDICTED WITH OTHER METHODS

Pile raft settlements were measured during the project construction. DeepFND software predicted a maximum of 17 mm settlements at the last pile row location (closest to the pile raft edge), matching the measured settlement values. Table 2 below, presents the predicted settlements at the middle of the pile raft, in comparison to values predicted from other methods and sources.

Table 2: Maximum Settlement Predictions with DeepFND and Other Methods

Method

Settlement (mm)

DeepFND – Pile Rafts Module (Non-Linear Soil Springs Method)

33

Equivalent Foundation According to Polish Code (PN-69)

32.7

Equivalent Foundation According to Tomlinson

30.9

Equivalent Foundation According to Poulos (Randolph Formula)

34

Equivalent Foundation According to Van Impe

33.4

 

DeepEX Software Can Design any Pile Foundation Model in Minutes!

Design Helical Piles, Drilled Piles, Driven Piles, Caissons, Drilled-In-Displacement +more!

Vertical and Lateral Analysis of Single Piles, Pile Groups and Pile Rafts in a single software suite!

AASHTO LRFD, CALTRANS, EUROCODES 2, 3, 7, 8, ACI, BS, Australian Codes, Chinese Codes +more!

Review DeepFND Capabilities

Solutions for Geotechnical Engineering Professionals:

Logo_DeepEX.png

DeepEX

Shoring
Design
Software

Learn More

dfnd.jpg

DeepFND

Pile Foundations
Design
Software

Learn More

HP.jpg

HelixPile

Helical Piles
Design
Software

Learn More

SP.jpg

SnailPlus

Soil Nail Walls
Design
Software

Learn More

Trusted By

1. Logo Arup.JPG
2. Logo Keller.JPG
3. Logo PBA.JPG
4. Logo AECOM.JPG
5. Logo Hatch.JPG
6. Logo Mottmac.JPG
7. Logo Jacobs.JPG
8. Logo GZA.JPG
9. Logo GarretFlaming.JPG
10. Logo Lavalin.JPG
11. Logo Magnusson Klem.JPG
12. Logo MoDOT.JPG
13. Logo URS.JPG
14. Logo Stalworth.JPG
15. Logo Kleinfelder.JPG
16. Logo Samsung.JPG
17. Logo Gepfreeze.JPG
37._Logo_ASAP.jpg
19. Logo GulfConstruct.JPG
20. Logo Temeltas.JPG
21. Logo AttikoMetro.JPG
22. Logo Flatiron.JPG
23. Logo Kozaba.JPG
24. Logo Siefert.JPG
25. Logo AlGhuair.JPG
26. Logo Earthtech.JPG
27. Logo Russo.JPG
28. Logo Danbro.JPG
29. Logo Atkins.JPG
30. Logo LBFoster.JPG
31. Logo Dominion.JPG
32. Logo Acons.JPG
33. Logo NSCC.JPG
34. Logo Econstruct.JPG
35. Logo AUD.JPG
18. Logo Eptisa.JPG

      Deep Excavation LLC
    240 W 35th Street, Suite 1004
    New York, NY, 10001
    U.S.A