static pile load tests - jan maertens 2003-05-07ebis.pdfstatic pile load tests by jan maertens, jan...
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![Page 1: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/1.jpg)
STATIC PILE LOAD TESTS
By Jan MAERTENS, Jan Maertens BVBA and KU Leuven
Noel HUYBRECHTS, WTCB
![Page 2: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/2.jpg)
Introduction :
• Piles in dense sand layer• Instrumentation (= extensometers)
• For each type: 2 piles with the same length• Aim: determination of installation
coefficients for this specific test site and pile type, to be integrated in NAD-EC7
• A certain number of piles have been excavated
![Page 3: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/3.jpg)
Friction ratio Rf (%)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
Screw piles - Limelette II Cone Penetration Test: cone resistance qc (MPa)
De
pth
(m
)Average CPT E(static test field)
![Page 4: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/4.jpg)
Test Procedure:Scientific or common?
• Scientific:– each load step is maintained till stabilisation– decreasing load steps when failure is approaching– => almost no influence of rate of loading– => accurate value of failure load
• Common:– same test procedure as for normal control load tests– => same interpretation method as for normal control
load tests
![Page 5: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/5.jpg)
Common procedures:
• STS 21: loading till 1,5 x service load and waiting for stabilisation at 1,0 and 1,5 x service load– = control of creep load
• NCP:loading in 8 steps till 2,0 x service load and waiting for stabilisation at each step– = control of creep load and bearing capacity– = very long tests
• LCPC-ISSMFE: loading in 8 steps till 2,0 x service load Each step is maintained for 1 hour– = control of creep load and bearing capacity– = within 1 working day
![Page 6: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/6.jpg)
Adopted test procedure:
- Loading in 8 to 10 constant steps Each step holded constant for 1 hour
- Loading with 1/2 steps when failure appears to early (s < 25mm)
- Value of loading steps determined based on available information
- For the second pile of each type adapted ∆Q when necessary
![Page 7: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/7.jpg)
0 1 2 3 4 5 6 7 8 9 10 11 12
Time (hours)
Pile
Lo
ad Q
60'
∆Q
Qmax
10'
10'
10'
30'
60'
60'
60'
60'
60'
60'
60'
60'
60'
![Page 8: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/8.jpg)
Pile Failure during step n°A1bis Fundex 13A2 Olivier 8 + 1*0,5A3 Omega 8+ 3*0,5A4 De Waal 7 + 3*0,5B1 Prefab 9 + 2*0,5B2 Prefab 11B3 Atlas 8 + 2*0,5 R + 2*0,5B4 Atlas 9 R + 3*0,5C1bis Fundex 5 + 1*0,5 (structural problem)C2 Olivier 7 + 1*0,5 (structural problem)C3 Omega 9 + 3* 0,5C4 De Waal 8 + 2*0,5
![Page 9: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/9.jpg)
Results of each static load test :
• Load - pile head settlement diagram
• Variation of pile head settlement during the different load steps
• Creep curve = increase of settlement during the last 30 min of each load step
![Page 10: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/10.jpg)
S c re w p i le s - L im e le tte I I - S L T : P ile P ile B 2 -P r e ca s t
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
0 2 5 0 5 0 0 7 5 0 1 0 0 0 1 2 5 0 1 5 0 0 1 7 5 0 2 0 0 0 2 2 5 0 2 5 0 0 2 7 5 0 3 0 0 0 3 2 5 0 3 5 0 0 3 7 5 0 4 0 0 0
P ile L o a d Q (k N )
Pil
e h
ea
d (
s0)
& b
as
e (
sb)
dis
pla
ce
me
nt
(mm
)
s 0
s b
![Page 11: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/11.jpg)
S c re w P i le s - L im e le t te II
S L T : P ile P i le B 2 -P re c a s t
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
1 1 0 1 0 0
T im e in m in u te s (lo g a rith m ic s c a le )
Pile
he
ad
dis
pla
ce
me
nt
s0
(m
m)
S te p 1 (3 2 9 kN ) S te p 7 (2 1 3 1 k N )
S te p 2 (6 6 2 kN ) S te p 8 (2 6 4 2 k N )
S te p 3 (9 9 3 kN ) S te p 9 (2 9 7 3 k N )
S te p 4 (1 3 2 4 k N ) S te p 1 0 (3 3 0 4 k N )
S te p 5 (1 6 5 4 k N ) S te p 1 1 (3 6 1 6 k N )
S te p 6 (1 9 8 2 k N )
![Page 12: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/12.jpg)
S c re w p i le s - L im e le tte I I - S L T : P ile P ile B 2 -P r e ca s t
0
0 . 2 5
0 .5
0 . 7 5
1
1 . 2 5
1 .5
0 2 5 0 5 0 0 7 5 0 1 0 0 0 1 2 5 0 1 5 0 0 1 7 5 0 2 0 0 0 2 2 5 0 2 5 0 0 2 7 5 0 3 0 0 0 3 2 5 0 3 5 0 0 3 7 5 0 4 0 0 0
P ile L o a d Q ( kN )
Cre
ep
: ∆
si l
as
t 3
0 m
inu
tes
(m
m/3
0m
in.)
Q c = 2 8 9 0 k N
![Page 13: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/13.jpg)
Screw piles - Limelette II - SLT : PileB3-Atlas
0
10
20
30
40
50
60
70
80
90
100
0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000
Pile Load Q (kN)
Pile
he
ad
(s 0)
& b
ase
(s b
) d
isp
lace
me
nt
(mm
)
s0
sb
extrap
Extrapolation of the first loading curve based on Chin curve
![Page 14: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/14.jpg)
Screw piles - Limelette II - SLT : PileB3-Atlas
0
1
2
3
4
5
6
7
8
0 500 1000 1500 2000 2500 3000 3500 4000
Pile Load Q (kN)
∆l =
Pile
he
ad
(s0
) -
ba
se (
sb)
dis
pla
cem
en
t (m
m)
first cycle
polynomial extrapolation
Extrapolation the elastic deformation
![Page 15: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/15.jpg)
Table 2 – Q corresponding to s0 = 10%Db: comparison between real measured values (Qs0 = 10%.Db) and extrapolated values by means of the Chin method (Qextrap,s0=10%Db).
Pile Qs0 = 10%.Db [kN]
Qextrap,s0=10%Db
[kN] Qextrap,s0=10%Db / Qs0 = 10%.Db [-]
Range s0 for CHIN extrapolation [mm]
Fundex – A1bis 2988 3064 1.03 11.4 → 27.1 Omega - A3 2786 2772 0.99 16.8 → 32.4 Omega - C3 2723 2718 1.00 12.5 → 27.8 De Waal – A4 2400 2404 1.00 11.0 → 26.8
De Waal – C4 2248 2210 0.98 8.8 → 22.9
Precast – B1 2636 2649 1.01 9.5 → 34.9 Precast - B2 3476 4254 1.22 11.6 → 18.5 Atlas - B3 (3430)* 3528 (1.03) 24.0 → 35.5 Atlas - B4 (3326)* 3454 (1.04) 11.8 → 24.3 Olivier - A2 - 3354 15.2 → 31.0 Olivier - C2 - 2908 9.6 → 25.3 Fundex – C1bis - 1778 8.6 → 27.2 * Values obtained from extrapolation of the load settlement curve (section 3.2.1).
![Page 16: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/16.jpg)
Penetration rate at failure:
- constant rate of penetration at failure was not possible
![Page 17: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/17.jpg)
S c re w p ile s - L im e le t te I I
S L T : P il e A 1 b is - F u n d e x
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
9 :0 0 1 1 :0 0 1 3 :0 0 1 5 : 0 0 1 7 :0 0 1 9 :0 0 2 1 :0 0 2 3 :0 0 1 :0 0
T im e
Pil
e h
ea
d v
elo
cit
y (
v0
) (m
m/m
in)
V 0
![Page 18: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/18.jpg)
Extensometer data:
- Have been used during the loading to check pile shaft behavior
- Will be used:• To deduce:
– variation of load with depth within the pile– mobilisation of base resistance and shaft friction
• Interpretation of measurements is very sensitive for:– corrections to be applied– value of EA
• Values to be published after a detailed sensitivity analysis
![Page 19: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/19.jpg)
S c re w p i le s - L im e le tte I I - S L T : P ile B 4 -A tla s
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
0 2 5 0 5 0 0 7 5 0 1 0 0 0 1 2 5 0 1 5 0 0 1 7 5 0 2 0 0 0 2 2 5 0 2 5 0 0 2 7 5 0 3 0 0 0 3 2 5 0 3 5 0 0 3 7 5 0 4 0 0 0
P ile L o ad Q (k N )
Pile
he
ad
(s
0)
& b
as
e (
sb)
dis
pla
ce
me
nt
(mm
)
s 0
s b
R is k o n s tr u c tu r a l
p ile fa ilu re
u n lo a d in g s te p 9
a ft e r 2 m in u te s .
R e m o v a l
e x t e n s o m e te r &
re lo a d in g
S t ru c tu ra l
p il e f a ilu re
a ft e r 1 9
m in u t e s
in re l o a d
s t e p 1 1 -
3 4 1 9 k N
Extensometer readings during the static load testsLoading stopped when risk of failure
![Page 20: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/20.jpg)
Screw piles - Limelette II
SLT : Pile B4-Atlas
0
200
400
600
800
1000
1200
1400
1600
1800
2000
8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00 2:00
Time
Extensometer measurements (µstrain)
EXT 1
EXT 2
EXT 3
EXT 4
EXT 5
EXT 6
Example of extensometer readings
![Page 21: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/21.jpg)
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S c r e w p i le s - L im e le tt e I I - S L T
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 0 0
0 2 5 0 5 0 0 7 5 0 1 0 0 0 1 2 5 0 1 5 0 0 1 7 5 0 2 0 0 0 2 2 5 0 2 5 0 0 2 7 5 0 3 0 0 0 3 2 5 0 3 5 0 0 3 7 5 0 4 0 0 0
L o a d d is t r ib u ti o n (k N )
Pile
ba
se
dis
pla
ce
me
nt
sb
(m
m)
Q
Q b
Q s
Mobilisation of base and shaft resistance
![Page 23: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/23.jpg)
Interpretation of the results :
• Determination of the values Qmax, Q25mm, Q 0,10Db, Q 0.15Db and Qc
• Estimation of the allowable load R cal– R cal,1 = 0,8 . Qc– R cal,2 = Q 0,10Db / 1,7– R cal,3 = Q 0,10Db / 2,0– => R cal,2 and R cal,3 are determinant for all piles
![Page 24: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/24.jpg)
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CALCULATED PILE BEARING CAPACITIES :Cfr. Belgian Practice (Holeyman et al, 1997)
- Ultimate base resitance: Rbu = β . αb . εb . qbu
(m) . Ab
With :β = 1,0αb = installation factor
εb = parameter for stiff clays
qbu(m) = ultimate unit pile base resistance
according to the De Beer method Ab = nominal pile base cross section area
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- Ultimate shaft friction:
Total side friction increment ∆Qst has not been used
Based on cone resistance:
With: ξf = installation factor
ηp*
= soil parameter
qci = cone resistance
∑∑ == cipisfsuiisfsu qHXqHXR *...... ηξξ
![Page 29: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/29.jpg)
Remark:For all screw piles:Db = maximum diameter of the screw.
For Fundex:Ds = maximum diameter of the tube
For De Waal, Olivier, Omega and Atlas:Ds = maximum diameter of the screw
Remark:Calculations have been performed:- starting from electrical CPT tests- based on individual CPT’s
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Comparison of total pile bearing capacity-Global coefficient:
Global coefficient = Q / R
With: Q = measured pile head loadR = calculated total bearing capacity
Global coefficient for a settlement of 0,10 Db
0,75 à 0,97 for screw piles0,89 à 1,02 for driven piles
![Page 31: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/31.jpg)
Screw Piles - Limelette IIQ/Ru; ERTC3
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
1,1
1,2
1,3
1,4
0 2 4 6 8 10 12 14 16 18 20
sb/Db (%)
Q/R
u; E
RT
C3
(-)
Precast driven : Screw piles : C2 (no sb meas.):
Based on ERTC 3 calculation method
![Page 32: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/32.jpg)
Screw Piles - Limelette IIQ/Ru; NA-EC7
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
1,1
1,2
1,3
1,4
0 2 4 6 8 10 12 14 16 18 20
sb/Db (%)
Q/R
u; N
A-E
C7
(-)
Precast driven : Screw piles : C2 (no sb meas.):
Based on NA-EC 7 method
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Screw Piles - Limelette II + Driven piles Limelette IQ/Ru; ERTC3
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
1,1
1,2
1,3
1,4
0 2 4 6 8 10 12 14 16 18 20
sb/Db (%)
Q/R
u;E
RT
C3
(-)
B1-Driven Precast Pile
B2-Driven Precast Pile
Pile 8 - Driven Precast Pile(Limelette I - 1995/1996)
Other driven piles at Limelette test site
Based on ERTC 3 calculation method
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Conclusion 1 :
• Proposal :– for driven piles: αb = 1,0 ξf = 0,8
– for screwed piles: αb = 0,8 ξf = 0,8
• Assumptions:– qc from E1 cone
– base resistance calculated according to De Beer method ( 0,20m steps)
– considered diameters = maximum diameter of the screw/tube
– failure criterion = 0,10 Db
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Conclusion 2 :
• When proposed installation coefficients are introduced in design calculations: safety factor of 2 should be applied on base resistance and shaft friction
![Page 36: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/36.jpg)
Additional controls:
- Excavation of a certain number of piles- To check the pile dimensions- To find an explanation for some anomalies
- Inclinometer measurements in the driven precast piles
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DE WAAL C9 FUNDEX A1bis OMEGA A3
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OLIVIER C2
ATLAS B4
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ATLAS
Screw flanges loam
ATLAS
Screw flanges compact sand
![Page 40: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/40.jpg)
OMEGA C3
![Page 41: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/41.jpg)
OMEGA A3
![Page 42: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/42.jpg)
DE WAAL C9
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Pile B4 Atlas
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FUNDEX C1bis
Segregation due to use of too dry concrete
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S c re w p ile s - L im e le t te II
S L T : P ile C 1 b is -F u n d e x
0
5 0 0
1 0 0 0
1 5 0 0
2 0 0 0
2 5 0 0
3 0 0 0
3 5 0 0
4 0 0 0
4 5 0 0
5 0 0 0
8 :0 0 1 0 :0 0 1 2 : 0 0 1 4 :0 0 1 6 :0 0 1 8 :0 0 2 0 :0 0 2 2 :0 0 0 : 0 0
T im e
Ex
ten
so
me
ter
me
as
ure
me
nts
(µ
str
ain
)
E X T 1
E X T 2
E X T 3
E X T 4
E X T 5
E X T 6
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OLIVIER C2
Grooving underside screw flange
![Page 50: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/50.jpg)
OLIVIER C2
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Volume of soil displaced
by cutting tooth during
withdrawal
![Page 52: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/52.jpg)
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Inclinometer Results - Driven Precast B2 pile
0
1
2
3
4
5
6
7
8
9
10
-200 -150 -100 -50 0 50 100 150 200
Deviation (mm)
dept
h (m
)
Direction AA'
Direction BB'
![Page 54: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/54.jpg)
S c re w P ile s - L im e le t te I I
0
5 0 0
1 0 0 0
1 5 0 0
2 0 0 0
2 5 0 0
3 0 0 0
F u n d e x A1 b is
Oliv
ier
A2
Om
e g a A3
De W
a a l A4
Pre
fab B
1
Pre
fab B
2
At la
s B3
At la
s B4
Fu n d e x C
1 b is
Oliv
ier
C2
Om
e g a C3
De W
a a l C4
Rc
ai (
kN
)
R c a 1R c a 2R c a 3
![Page 55: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/55.jpg)
S crew P iles - L im e le tte II
0
1
2
3
4
5
6
7
8
9
10
11
12
Fundex A1b is
Oliv
ier A
2
Om
ega A3
De W
aa l A4
Pre
fab B
1
Pre
fab B
2
Atla
s B3
Atla
s B4
Fundex C1b is
Oliv
ier C
2
Om
ega C3
De W
aa l C4
s 0i (
mm
)
s 01s02s03
![Page 56: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/56.jpg)
S c re w P ile s - L im e le t te I I
0
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
Fu n d e x A
1 b is
Oliv
ier
A2
Om
e g a A3
De W
a a l A4
Pre
fab B
1
Pre
fab B
2
At la
s B3
At la
s B4
Fu n d e x C
1 b is
Oliv
ier
C2
Om
e g a C3
De W
a a l C4
s bi (
mm
)
s b 1s b 2s b 3
![Page 57: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/57.jpg)
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Friction ratio Rf (%)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
Screw piles - Limelette II Cone Penetration Test: cone resistance qc (MPa)
De
pth
(m
)Average CPT E(static test field)
![Page 59: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/59.jpg)
Inclinometer Results - Driven Precast B1 pile
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
-200 -160 -120 -80 -40 0 40 80 120 160 200
Deviation (mm)d
ep
th (
m)
Direction AA'
Direction BB'
Inclinometer Results - Driven Precast B2 pile
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
-200 -160 -120 -80 -40 0 40 80 120 160 200
Deviation (mm)
de
pth
(m
)
Direction AA'
Direction BB'
![Page 60: STATIC PILE LOAD TESTS - Jan Maertens 2003-05-07Ebis.pdfSTATIC PILE LOAD TESTS By Jan MAERTENS, Jan Maertens BVBA and KU Leuven Noel HUYBRECHTS, WTCB. ... – decreasing load steps](https://reader031.vdocuments.site/reader031/viewer/2022013104/5ca55de288c99388188c6a47/html5/thumbnails/60.jpg)
Conclusies : mbt case study SKW & LIM
• Verschillende sondeermethodes :⇒ grote verschillen⇒ afh. van grondsoort⇒ M1-Cont : resultaten SKW niet veralgemenen⇒ bijdrage NAD-EC7 (conversiefactoren)
• Afleiding grondkarakteristieken uit tabel NAD⇒ aanvaardbaar⇒ correctiefactor CN te groot ? σ’v0< 50 kPa
• Vergelijking met enkele courante correlaties⇒ aansluiting
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