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Remediation of 3 years old existing temporary shoring wall

Remediation of 3 years old existing temporary shoring wall

Remediation of 3 years old existing temporary shoring wall

(OP)
Hi all,
The temporary wall was constructed 2.5 years ago. Due to some reasons, the owner did not proceed with the construction activities. As a contractor, we are asked to do some modification on existing shoring wall for our work. The shoring types are continuous secant pile wall and solider -timber lagging shoring system. we have a conditional assessment (only visually) report from the owner. In the report, they did some monitoring survey and found that shoring wall moved for 50 mm within 2 months and also stated that material performance is not guaranteed. the tiebacks would have de-stressed already and it needs lift-off test to re-evaluate the anchors load. With these conditions, what are the repair works would you consider. I think the following repair actions may work: 1) replace the timber lags wherever it is damaged or bowed 2) additional tieback installation if required 3) shotcrete the damaged caisson piles. After we do these repair works, will it be safe shoring wall? Note: wall is fully loaded (complete mobilization of lateral pressure) and observing continuous wall movement (top deflection)and height of wall varies from 5 to 8 m. do you recommend any field Non-destructive testing/any field test to verify the shoring wall conditions
Thanks,

RE: Remediation of 3 years old existing temporary shoring wall

It would be well worth any effort to get hold of the original wall design- check what it was designed to accommodate and see how the observed rotation / deformations affect the factors of safety.

Probably the remedial works you suggested would suffice- but the new tie-backs would need to account for the wall now out of plumb. You may consider integrity testing a few of the piles- make sure they aren't approaching the point of no return...

All the best,
Mike

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