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Prof. Roger FRANK CERMES (ENPC-LCPC) Tokyo IWM August 2004 PRESENT ISSUES IN DESIGN AND CONSTRUTION OF MICROPILE SYSTEMS.

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Presentation on theme: "Prof. Roger FRANK CERMES (ENPC-LCPC) Tokyo IWM August 2004 PRESENT ISSUES IN DESIGN AND CONSTRUTION OF MICROPILE SYSTEMS."— Presentation transcript:

1 Prof. Roger FRANK CERMES (ENPC-LCPC) Tokyo IWM August 2004 PRESENT ISSUES IN DESIGN AND CONSTRUTION OF MICROPILE SYSTEMS

2 1) Present state of European Norms (design, construction and testing) 2) Need for well documented field tests and case histories 3) Control of installation effects

3 1) CEN European standards

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5 CEN/TC 250Date: EN CEN/TC 250Secretariat: NEN Eurocode 7 Geotechnical design - Part 1: General rules Eurocode 7 Entwurf, Berechnung und Bemessung in der Geotechnik – Teil 1: Allgemeine Regeln Eurocode 7 Calcul géotechnique - Partie 1: Règles générales ICS : ;

6 Under preparation : Euronorm on pile load tests (from ETC3 work)

7 2) Micropile design from well documented load tests and case histories

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9 LATERAL LOADING TEST

10 AXIAL LOAD ON VERTICAL PILE Force (kN) Depth z (m) ( compression )

11 AXIAL LOAD ON INCLINED MICROPILE Depth z (m) Force (kN)( traction )

12 3) Installation effects

13 _______ Movement of the water level ( sea tide, river flow) _______ Wooden piles : B = 0,30 m s/B = 4 Micropiles : B = 0,22 m s/B = 10

14 STABILIZATION OF THE SETTLEMENTS AFTER MICROPILES INSTALLATION

15 RAILWAY EMBANKMENT STABILIZED BY MICROPILES : Additional settlement due to the installation of the micropiles

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18 Thank you for your attention !


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