Micropiles - Design Parameters Interpreted from 280 Load Tests, Dr ...

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Verification Testing ‣ Two verification tests at each bridge ‣ 2.5 DL ‣ One verification test failed at each bridge ‣ From tests taken to failure: ‣ Micropiles in medium dense sand (Bridge 0.42L) : Load Transfer Ratio = 10 kip/ft (Bond Strength = 44 psi) ‣ Micropiles in stiff silty clay (Bridge 7.85): Load Transfer Ratio = 4.1 kip/ft (Bond Strength = 18 psi)
Proof Load Testing ‣ 100% of micropiles satisfactorily proof load tested ‣ Maximum proof load test limited by existing bridge structure ‣ 1.25 to 1.5 DL ‣ 12-hour load hold under DL ‣ Tested groups of 6 and 8 micropiles ‣ Four to six sacrificial flat jacks per group ‣ Lock off at 0.5 DL
Page 1 and 2: Hollow Core Bar Micropiles at the N
Page 3 and 4: Introduction ‣ Project Owner: New
Page 5 and 6: Location Bridge 7.85 Bridge 0.42L
Page 7 and 8: Existing Conditions
Page 9 and 10: Retrofit of Existing Foundation
Page 11 and 12: Bridge 7.85 (80 Micropiles) P2 P1
Page 13 and 14: Micropile Characteristics ‣ Desig
Page 16: Micropile Observation ‣ Drilling
Page 30 and 31: Proof Test Summary- Sand 0.0 Load (
Page 32 and 33: Load Test Interpretation τ α ∆
Page 34 and 35: Load Test Interpretation ‣ Applie
Page 36 and 37: Bond Values in Stiff Silty Clay 14
Page 38 and 39: Closure ‣ Ultimate bond strength
Page 42 and 43: Verification Tests in Sand

Micropiles - Design Parameters Interpreted from 280 Load Tests, Dr ...

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