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Safe Offset to Avoid Pile-Driving Impact

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Ammonite

Geotechnical
Joined
Oct 20, 2006
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6
Location
US
Here's my setup: a very old timber bulkhead (16 ft exposed) adjacent to an operational timber dock is in bad shape: bowing in places, timber deteriorated, etc. I need to locate a new dock structure in shallow water nearby but am concerned about vibrations and impact waves from piling (both sheet-piles and pipe piles)triggering a collapse of the wall and impacting the existing dock. Profile I'd be driving in: up to 13 feet of fine alluvial sand and silt, some organics; then med. dense to dense sand and gravel.

What I'd like to know is how far away do I have to be from the timber bulkhead to be sure the disturbance from the piling activity has attenuated? Is there a way to quantify the relationship between magnitude of ground vibration and its propagation distance depending on the soil? Thank you very much for any input you might have.

 
Not accurately...usually have to measure it for site specific conditions. If it's any consolation, your conditions tend to attenuate vibrations more than some others.
 
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