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Long-Term Behavior of Ground Anchors and Tieback Walls
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1998-11-01
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[PDF-10.29 MB]
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Edition:September 14, 1995 - August 31, 1998
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Abstract:The purpose of this project is to advance the state of knowledge on the long-term behavior of ground anchors and make practical recommendations. Two important issues were addressed: long-term movements and corrosion. For the long-term movements, some of the main findings from the physical and numerical simulations are: 1. Given the same total anchor length, grouted anchors with a short tendon bond length have higher capacities and lower creep rates than grouted anchors with a long tendon bond length. 2. The capacity of grouted anchors in a stiff clay was found to increase over five years even when under load over the five years. 3. The power law model s1/s2=(t1/t2)n where s1 and s2 are the anchor movements at time t1 and t2 fit the data well and may be used to predict long-term movements. 4. A delayed failure occurred in triaxial tests on a clay when the stress level was larger than the yield stress of the soil. 5. Long-term horizontal movements can develop in anchored walls if the vertical capacity of the soldier piles is not sufficient to resist the down drag from the retained soil. 6. The power law model can also be used for the long-term movement of walls. 7. The bending moment profile over the long term tends to shift towards smaller moments at the anchor points. 8. The anchor loads seem to vary very little as a function of time (±10% after five years). 9. An earth pressure coefficient chart is given to design anchored walls for a targeted deflection.
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