Presenting a Technical Report

Presenting a Technical Report

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 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) Soil Description

Depth (m) Soil Description N Values 1 2 3 Water Content 13% CLAYEY SILT TILL: Hard reddish brown to brown moist clayey silt; trace to some sand and fine gravel 4 37 45

15% 15% 46 18% 65 12% 78 15% 5 6 7 SILT: Very dense brown silt; trace sand and fine gravel, seams of fine sandy silt and fine sand

15% 69 15% Maximum Added Load Minimum Added Load Item Owner Value Scheme Pile Caps lg 6m x 6m x 2.4 2.8 x 2.8 x 1.5 Pile Caps sm 4.2 x 4.2 x 1.8

2.6 x 2.6 x 1.2 Pile Caps all > 600 m3 120 m3 Caisson Piles 128 60 Gr Beam Piles 64 32 Test Pile Specifications and Results Maximum Applied Load Shaft Diameter

Area of #20 bar Yield load of bar Free Length of Micropile Anchor Length of Micropile 1791 kN 197 mm 3168 mm2 1637 kN 2.5 m 4.0 m Strength of Grout 52 MPa Elastic Compression (max) Ultimate Soil Adhesion 3.3 mm 720 kPa 2000

Average of Dial gauge 1 and 2 724 kPa 1800 658 kPa LOAD (kN) 1600 592 kPa 1400 Slope 2 493 kPa 1200

395 kPa 1000 800 296 kPa Slope 1 600 400197 kPa 200 -2 3 8 13 18 23 MOVEMENT (mm)

28 33 38 Note: Slope 1 refers to calculated elongation from 80% of the free length. Slope 2 refers to calculated elongation from the free length plus 50% of anchor length of micropile. This elongations take into account the strength of steel and grout. 43 Creep (mm) Creep Plot 7.0 6.5 6.0 5.5 5.0 4.5 4.0

3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 977 kN 1mm per cycle 2 mm per cycle 1221 kN 1465 kN 1628 kN 1791 kN

1 10 Time (min) 100 1000 3 mm per cycle 4.5 mm per cycle Contractometer Anchor Locations Anchor Position (m) 0 1.083

2.167 3.250 4.333 5.417 6.390 Fixed Top of Pile Movement Movement Plot 6.39 0 -5 5.42 4.33 3.25 2.17 1.08

Dial Gauge Reading 0.00 Load -4000 11-Jul 10-Aug 9-Sep 9-Oct 8-Nov 8-Dec 7-Jan 6-Feb 7-Mar

6-Apr 6-May 5-Jun 5-Jul -3500 -3000 -10 -20 -2000 -25 -1500 -30 -1000

-35 -500 -40 0 -45 500 -50 1000 -55 1500 -60 2000

Time Load (kN) -2500 MOVEMENT (mm) -15 Movement Plot 6.39 -5 4.33 3.25 2.17 1.08

Dial Gauge Reading Load -4000 11-Jul 10-Aug 9-Sep 9-Oct 8-Nov 8-Dec 7-Jan 6-Feb 7-Mar 6-Apr

6-May 5-Jun 5-Jul -3500 -3000 -10 -2500 -20 -2000 -25 -1500 -30

-1000 -35 -500 -40 0 -45 500 -50 1000 -55 1500 -60

2000 MOVEMENT (mm) -15 Time Load (kN) 0 5.42 Movement theat Micropile Movement Along along Test Pile 1200kN at Design Load of 1200 kN Movement (mm)

35 30 25 20 15 10 5 0 6.39 bottom 5.42 4.33 3.25 2.17 1.08 Depth along the Micropile (m) 0.00 top Movement along the Micropile at 1628 kN

Movement (mm) 35 30 25 20 15 10 5 0 6.39 bottom 5.42 4.33 3.25 2.17 1.08 Depth along the Micropile (m) 0.00 top Movement (mm)

Movement along the Micropile at failure load 1791 kN 40 35 30 25 20 15 10 5 0 6.39 bottom 5.42 4.33 3.25 2.17 1.08 Depth along the Micropile (m) 0.00 top

Tensile Stress Distribution Pattern Under Preloading Compressive Stress Distribution Pattern Under Failure loads Distribution Pattern of the First Principal Stress around Pile Top

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