UKTC Archive

Re: Gabion wall within RPA

Subject: Re: Gabion wall within RPA
From: Jerry Ross
Date: Jul 23 2020 08:59:21
Geocells don't magically make loads disappear so of course some load (and hence some potential for compaction) is transmitted through them to the soil. The point is that geocell systems SPREAD//that load, so the full weight of a point load like a stiletto heel or a lorry tyre, for instance, is distributed over a wide area. But the gabion is not a point load: it IS the wide area, so there is nothing to spread. I suppose you could carry an exceptionally deep geocell system way out on either side of the gabion, but I'm not sure it would be practical or effective.

(BTW, the gabions that hold up the road embankment on the edge of my property aren't on a concrete foundation) (There again, they were rather thrown in place when the embankment started sliding into the brook)




On 23/07/2020 09:08, Alastair Durkin wrote:
Hi Ben, so do you not specify cellular confinement systems within RPAs? Any 
chance you can point me to the evidence for the compaction statement?

I'm sure there is always going to be some minor compaction, because you are 
putting weight onto the soil, and loading it repeatedly, but this will be a 
matter of degree and depend greatly on the soil type and the loading. What's 
really important is that the correct depth of cell is used for the likely 
loading.

Alastair


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Ben Oates
Sent: 22 July 2020 18:39
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Gabion wall within RPA

Hi Lee, my experience of gabion wall installations required substantial 
concrete foundations dug into the ground. I'm no engineer and it depends on 
many factors but gabions are made up with heavy stones and their weight will 
compact soil. Despite a perpetuated myth, cellular confinement systems 
compact soil under load. If you can get hold of the engineering drawings 
including cross sections etc. those may help you visualise what is proposed?
ATB, Cheers, Ben

________________________________
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> on 
behalf of Lee Davies <leemdavies01@xxxxxx.com>
Sent: 22 July 2020 18:11
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Gabion wall within RPA

Hi all,

I have been asked to assess the impact of installing a gabion wall with the 
RPA of a neighbour's tree and was wondering if anyone has had experience of 
this?

I am assuming that because the stones will allow water and air infiltration 
that the wall wont have any significant impact on the tree?

In terms of soil compaction, should a no-dig foundation using Cellweb or 
similar be specified to spread the load of the wall?

I look forward to hearning your thoughts.

Thanks,

Lee



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