Lefranc and Lugeon correlations

[cmorgh]

Hi,
I am searching for a correlation between the permeability values obtained by Lefranc and Lugeon field tests. In other words, the permeability of a rock in Lugeon unit is calculated (upon completion of a Lugeon test) and the corresponding permeability in Lefranc method (i.e. say in cm/sec) is needed.

Thanks
Cmorgh

 

[dgillette]

I suggest you re-post this in Soil Testing Engineering, as it seems to get a lot more traffic than this forum, which seems to be a backwater.

DRG

 

[cmorgh]

Hi and Thanks
Prior to posting in here, I had posted that in soil testing engrg.
Thanks for your comment

 

[blueoak]

Doesn't Lugeon give you the permeability for rock while Lefranc is for soils (same number but diferent purposes, so no correlation needed)?
The only concern would be rock is very dependent on fissures so you have a lot of concern on directionality and if your test hit a crack.

Probably misunderstood, but I am curious.

 

[dgillette]

You might also try:

Home > Forums > Civil / Environmental Engineers > Activities > Soil/Groundwater environmental engineering Forum

I didn't know it existed until today.

DRG

 

[cmorgh]

Hi
To dgillette: Thanks for your care. I regret to say The forum in question seems to be no longer active.

To blueoak: You are right. Lugeon is expected to be performed in rock, whilst lefranc is expected to be performed in alluvium.
However, consider that the alluvial layer is grouted now (Lefranc being performed prior to grouting). The layer is now different from alluvium and mostly similar to rock (packer set up easily carried out after drilling). Hence, Lugeon is performed. Now, how to correlate these two results?

Regards
cmorgh

 

[cvg]

http://www.eng-tips.com/threadminder.cfm?pid=193

here's the groundwater forum

 

[cmorgh]

Thanks so much cvg,
Done.
Regards
cmorgh

 

[nhim]

Hi,
I guess Rock Slope Engineering, 3rd edition by Hoek&Bray may help you.