NCDOT s Recent Experience With Static Load Testing on Large Prestressed Concrete Piles
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1 NCDOT s Recent Experience With Static Load Testing on Large Prestressed Concrete Piles Michael Valiquette NCDOT Geotechnical Engineering Unit October 29, 2014
2 Oregon Inlet Gallant s Channel Cape Fear River Locations of Recent Static Load Tests 2
3 Oregon Inlet Overhead Photo 3
4 Reaction Beam Hammer Support Barge Oregon Inlet Overhead Photo 4
5 32-ft Water Depth Pile Tip = -120 ft. Oregon Inlet Subsurface Conditions 5
6 Oregon Inlet Instrumentation 6
7 Oregon Inlet Instrumentation 7
8 Oregon Inlet Test Pile Delivery 8
9 Oregon Inlet Pile Restraint Frame Sketch 9
10 Oregon Inlet Pile Reaction Beam Sketch 10
11 Oregon Inlet Pile Restraint Frame 11
12 Oregon Inlet Difficult Working Conditions 12
13 Oregon Inlet Difficult Working Conditions 13
14 Oregon Inlet Testing Jet String 14
15 Oregon Inlet Testing Jet String 15
16 Oregon Inlet 36 Pile Pick 16
17 Oregon Inlet 36 Pile Jetting 17
18 Oregon Inlet Hammer Pileco D225 ~ 50 kip ram 18
19 Oregon Inlet Hammer Pileco D225 ~ 50 kip ram 19
20 Oregon Inlet Barge Tilting 20
21 Oregon Inlet Crane Leveling Mats 21
22 Oregon Inlet Barge Leveling Ballast 22
23 Oregon Inlet Pile Driving 23
24 Oregon Inlet Pile Driving 24
25 Oregon Inlet Reaction Piles 25
26 Oregon Inlet Reaction Beam- 3,000 kip target load 26
27 Oregon Inlet Reaction Beam- 3,000 kip target load 27
28 Oregon Inlet Jack Group 28
29 Oregon Inlet Instrumentation 29
30 Oregon Inlet Load Displacement Curve 30
31 Oregon Inlet Post Test Lateral Movement 31
32 Oregon Inlet Pile Head Lateral Displacement 32
33 ? 32-ft Water Depth Oregon Inlet Strain Gage Interpretation 33
34 Oregon Inlet Lateral Load Test 34
35 Oregon Inlet Lateral Load Test 35
36 Oregon Inlet Lateral Load Test Deflection 36
37 Oregon Inlet Lateral Load Test Deflection Curves 37
38 Cape Fear Overhead Photo 38
39 Pile Tip = -80 ft. Cape Fear Subsurface Conditions 39
40 Cape Fear Spud Pile 40
41 Cape Fear Hammer ICE I-80 41
42 Cape Fear Pile Driving 42
43 Cape Fear Pile Driving 43
44 Cape Fear Reaction Beams ~ 1,660 kip target test load 44
45 Cape Fear Reference Beam 45
46 Cape Fear Jack and Tell Tale Rods 46
47 Cape Fear Bearing Plates 47
48
49
50
51 Cape Fear Pile Head Failure around 1,600 kips 51
52 Cape Fear Pile Head Failure around 1,600 kips 52
53 Cape Fear Pile Head Failure around 1,600 kips 53
54 Gallant s Channel Overhead Photo 54
55 Pile Tip = -95 ft. Gallant s Channel Subsurface Conditions 55
56 Gallant s Channel Pile Driving APE D80-42 Hammer 56
57 Gallant s Channel Reaction Beams ~ 1,660 kip target test load 57
58 Gallant s Channel Safety Cage and Instrumentation 58
59 Displacement (inches) FIGURE 2 - Applied Load (based on Hydraulic Jack Pressure Gage versus Top and Tip of Pile Displacement Test Pile - 30 Inch Square US 70 Bridge NCDOT TIP No. R Load (kips) Average Top of Pile Displacement from LVWDT's Adjusted Tell Tale A (Elev ft) Gallant s Channel Load Displacement Curve 59
60 Computed Displacement at Gage Level 5 0 FIGURE 21- Resistance below Strain Gage Level 6 Test Pile - 30 Inch Square US 70 Bridge NCDOT TIP No. R Resistance (kips) Below Gage Level 6 Linear (Below Gage Level 6) Gallant s Channel End Bearing 60
61 Load (kips) FIGURE 3 - Applied Load versus Time Test Pile - 30 Inch Square US 70 Bridge NCDOT TIP No. R Time (hours) Load Based on Pressure Gauge Re-zeroed Load Based on Load Cell Raw Load Based on Load Cell Gallant s Channel Load Cell vs Pressure Gauge 61
62 Microstrain (ue) 400 FIGURE 9 - Microstrain versus Time for Gage Level 1 Test Pile - 30 Inch Square US 70 Bridge NCDOT TIP No. R Time (hours) 1A 1B 1C 1D Level 1 Average Gallant s Channel Top Level Strain Gages 62
63 Load (kips) FIGURE 4 - Applied Load and Computed Average Strain Gage Level Forces versus Time Test Pile - 30 Inch Square US 70 Bridge NCDOT TIP No. R Time (hours) Load Based on Pressure Gauge Level 1 Average Level 2 Average Level 3 Average Level 4 Average Level 5 Average Gallant s Channel Load Distribution 63
64 Questions? Michael Valiquette NCDOT Geotechnical Engineering Unit October 29, 2014
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