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Prof. Roger FRANK CERMES (ENPC-LCPC)

Tokyo IWM August 2004. PRESENT ISSUES IN DESIGN AND CONSTRUTION OF MICROPILE SYSTEMS. Prof. Roger FRANK CERMES (ENPC-LCPC). 1) Present state of European Norms (design, construction and testing) 2) Need for well documented field tests and case histories

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Prof. Roger FRANK CERMES (ENPC-LCPC)

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

  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

  4. CEN/TC 250 Date:  2004-08 EN 1997-1 CEN/TC 250 Secretariat:   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 :  93.020; 91.080.01

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

  6. 2) Micropile design from well documentedload tests and case histories

  7. LATERAL LOADING TEST

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

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

  10. 3) Installation effects

  11. _______ 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

  12. STABILIZATION OF THE SETTLEMENTS AFTER MICROPILES INSTALLATION

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

  14. Thank you for your attention !

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