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92 micropiles – 60 caisson augmentation; 32 grade beam t / c

Credit Valley Hospital Pre-loaded Micropiles for Vertical Expansion of Parking Garage SMART Contractometer Results Nadir Ansari, Isherwood Associates Jim Bruce, Geo-Foundations Contractors Inc. Credit Valley Hospital. 92 micropiles – 60 caisson augmentation; 32 grade beam t / c

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92 micropiles – 60 caisson augmentation; 32 grade beam t / c

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  1. Credit Valley HospitalPre-loaded Micropiles for Vertical Expansion of Parking GarageSMART Contractometer ResultsNadir Ansari, Isherwood Associates Jim Bruce, Geo-Foundations Contractors Inc.

  2. Credit Valley Hospital 92 micropiles – 60 caisson augmentation; 32 grade beam t / c Socket begins below existing 1070 diameter drilled shafts 967 lineal metres of drilling 300 kPa design adhesion in till 197mm diameter boring Solid bar, #14, #18, #20 gr 75 Lightest service load = 688kN (c); 450kN (t) Heaviest service load = 1200kN (c)

  3. Soil Description

  4. Maximum Added Load Minimum Added Load

  5. Test PileSpecifications and Results Maximum Applied Load 1791 kN Shaft Diameter 197 mm Area of #20 bar 3168 mm2 Yield load of bar 1637 kN Free Length of Micropile 2.5 m Anchor Length of Micropile 4.0 m Strength of Grout 52 MPa Elastic Compression (max) 3.3 mm Ultimate Soil Adhesion ± 720 kPa

  6. Creep Plot

  7. Contractometer Anchor Locations Fixed Top of Pile Movement

  8. Movement Plot

  9. Movement Plot

  10. Movement Along Test Pile at 1200kN

  11. Tensile Stress Distribution Pattern Under Preloading

  12. Compressive Stress Distribution Pattern Under Failure loads

  13. Distribution Pattern of the First Principal Stress around Pile Top

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