Driving Piles Through 900mm Rock Revetment

[MCZubir]

Looking for guidance on a methodology to drive steel cylindrical piles through a 900mm rock revetment.

Revetment is on a batter and the depth is over 15m in some spots. What would be the most cost effective way to drive these piles through the revetment without removing the entire revetment and reinstating after the works are complete?

 

[Lomarandil]

Predrill the revetment depth and drive the rest? Otherwise.... good luck!

 

[EireChch]

You wont be able to drive piles through that, well at least not while keeping them straight and without a ruined pile toe.

You cant really pre drill either as it will need a rotary core drill. You may as well switch and make it a bored pile with permanent casing through the reventment.

 

[geotechguy1]

I don't see what you can do other than at least partly remove the revetment where the driven piles are going

 

[MCZubir]

I don't see what you can do other than at least partly remove the revetment where the driven piles are going

The initial idea is to locally remove the revetment with a long reach excavator off a spudded barge. However, exploring options to reduce the use of expensive marine equipment such as spudded barges/supply barges.

 

[HTURKAK]

Can you provide a sketch showing the cross-section ( section detail showing the stone size or weight ,if there is geotextile ..)
I would consider two options depending on the stone size ,

-If the stone size LT /EQ 300 mm, i would drive a sleeve pile using rocker pile ,
- If stone size EQ to 900 mm, i would remove the matching stones with some way ( manual or with a long reach excavator )

 

[EireChch]

I dont think you could drive piles through 15m of any stone thats larger than a gravel, that's probably tightly packed due to its self weight. It will take a hell of a lot of force to overcome the friction between those stones and to displace them horizontally out of the way!