François SCHLOSSER & Roger FRANK CERMES (ENPC-LCPC)

François SCHLOSSER & Roger FRANK François SCHLOSSER & Roger FRANK

CERMES (ENPC-LCPC)CERMES (ENPC-LCPC)

Tokyo IWM August 2004

Contribution to Session on : Contribution to Session on : - case histories, and case histories, and

- strategies for database construction strategies for database construction

1)1) Example of the Saint Maurice noise barrier Example of the Saint Maurice noise barrier (see 2(see 2ndnd Lizzi Lecture by F. Schlosser) Lizzi Lecture by F. Schlosser)

2) An example of database strategy (LCPC 2) An example of database strategy (LCPC design method for micropiles)design method for micropiles)

Preliminary questions : Preliminary questions :

- What is a micropile ?What is a micropile ?

- When can we expect ‘full interlocking’ effects? When can we expect ‘full interlocking’ effects?

FrenchFrench Micropile ClassificationMicropile Classification

1)1) Example of the Saint Maurice noiseExample of the Saint Maurice noisebarrierbarrier

ST MAURICE NOISE BARRIER WALL

1,75 m

,50 m

,25 m

,40

m

,40

m

3,50

m

2,84 m 4,00 m

4,00

m

34,21 NGF

35,10 NGF

20 °

13,5 °

0,65 m0,60 m

LATERAL LOADING TEST

0

50

100

150

200

250

300

350

400

450

0 5 10 15 20 25

déplacement de la tê te (mm)

micropieu vertical

micropieu inc liné

Vertical

Inclined( traction)

MICROPILE LOAD – DISPLACEMENT CURVES

Displacement at the top (mm)

Axi

al f

orce

at

the

top(

kN

)

-0,0005

0

0,0005

0,001

0,0015

0,002

0,0025

0,003

0 30 60 90 120 150

micronivelle (avant)

micronivelle (arrière)

inclinomètre (micropieu vertical)

inclinomètre (micropieu incliné)

comparateurs (face avant)

0

0,01

0,02

0,03

0,04

0,05

0 30 60 90 120 150ro

tati

on

(ra

d)

micronivelle (avant)

micronivelle (arrière)

inclinomètre (micropieu vertical)

inclinomètre (micropieu incliné)

comparateurs (face avant)

ROTATION ( R ) VERSUS APPLIED LOAD ( F )

F (kN)

R(rad)

R : rotation of the footing

F : (lateral) load applied to the wall

Applied load ( kN)

Measurement

Goupeg 1

Goupeg 2

Rotation (rad)

COMPARISON BETWEEN MEASUREMENTS AND GOUPEG CALCULATIONS

-2

0

2

4

6

8

10

12

14

16

0 100 200 300 400

effort (kN) pr

ofon

deur

sous

la se

mel

le (m

)

AXIAL LOAD ON VERTICAL PILEForce (kN)

Depth

z (m)

( compression )

-2

0

2

4

6

8

10

12

14

16

0 100 200 300 400

AXIAL LOAD ON INCLINED MICROPILE

Depth

z (m)

Force (kN) ( traction )

2) An example of database strategy2) An example of database strategy

Design of high pressure injected anchorages and micropiles Design of high pressure injected anchorages and micropiles LCPC method (Bustamante and Doix, 1985)LCPC method (Bustamante and Doix, 1985)

Conclusion (main) :Conclusion (main) :

- one should know right from the beginning what - one should know right from the beginning what is the aim of the study/test is the aim of the study/test