Use of micropiles in Southern Ontario

Laifa Cao, Scott Peaker

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Pile Foundations

ABSTRACT: Application of gravity-grouted and pressure-grouted micropiles at four sites in Southern Ontario is presented in this paper. The design methods for micropiles are reviewed and discussed. The design load varied from 400 to 800 kN for micropiles with lengths of 11.5 to 25 m and drillhole diameters of 150 to 320 mm. Challenges associated with the micropile installation in saturated cohesionless soils are also addressed. The load testing methods and results are discussed. The bond strength of grout-ground and load transfer back-calculated from the verification/performance tests are correlated to the soil conditions and micropile installation methods. Typical values of micropile bond capacity are recommended.

RÉSUMÉ: de conception des micropieux ont été examinées et discutées. La charge de conception variait de 400 à 800 kN pour les de micropieu dans des sols saturés sans cohésion a également été abordé. Les méthodes de test de charge et les résultats ont été discutés. La force de liaison du coulis au sol et du transfert de charge, calculée à partir des essais de vérification et de performance, était de la capacité des liaisons micropieu ont été recommandées.

Please include this code when submitting a data update: GEO2019_112

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