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

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Load Test Interpretation ‣ Applied elastic length concept to calculate ultimate bond in failed tests ‣ Compared to measured average bond values ‣ In medium dense sand: 12.4 kip/ft vs. 10 kip/ft measured ‣ In stiff silty clay: 5.9 kip/ft vs. 4.1 kip/ft (measured) ‣ The elastic length concept yielded reasonably accurate values of bond ‣ Applied this concept to 260 proof tests
Bond Values in Medium Dense Sand 30 Number of Micropiles 25 20 15 10 5 0 4 6 8 10 12 14 16 18 20 More Load Transfer Ratio (kip/ft)
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 23: Proof Load Testing ‣ 100% of micr
Page 30 and 31: Proof Test Summary- Sand 0.0 Load (
Page 32 and 33: Load Test Interpretation τ α ∆
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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