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Feedback: Soil friction HDD
26-05-2018, 10:32 PM, (This post was last modified: 10-06-2018, 07:49 PM by shaswin.)
#1
Feedback: Soil friction HDD
In the change logs of version 4.4.2 (July 2017) it is said in the Soil Wizard that, if installation method is a HDD, soil friction is set to zero.

Normal soil friction is taken into account when the HDD is not new (existing HDD). Setting the soil friction hard to zero in this case is not correct. The weak bentonite soil has been hardened. Give the user a choice in the Soil Wizard to apply a Zero soil friction or Normal soil friction if the installation method is a HDD.
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19-06-2018, 11:35 AM,
#2
RE: Feedback: Soil friction HDD
Actually, the user already has a choice: If the "installation method" is HDD, then the soil friction is set to zero. If the installation method is different, it is calcualted as "normal".

So just by changeing the installation method the requested functionality is already available.
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19-06-2018, 12:07 PM,
#3
RE: Feedback: Soil friction HDD
It is not the right method to do it I think, because choosing another installation method implicates different soil parameters, because the trench width is different.
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25-06-2018, 04:00 PM,
#4
RE: Feedback: Soil friction HDD
To clarify:
For settled betonite situations you can use the "boring" installation method. All soil parameter calculations are the same as with the "HDD" installation method except the soil friction and the displacement at max. soil friction. Those two are calcualted using the soil profiles in case of "boring" and are set to zero and 8 mm in case of "HDD".
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25-06-2018, 06:50 PM,
#5
RE: Feedback: Soil friction HDD
Okay.
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02-07-2018, 04:58 AM, (This post was last modified: 02-07-2018, 05:09 AM by shaswin.)
#6
RE: Feedback: Soil friction HDD
(25-06-2018, 04:00 PM)Dr. J Foerster Wrote: To clarify:
For settled betonite situations you can use the "boring" installation method. All soil parameter calculations are the same as with the "HDD" installation method except the soil friction and the displacement at max. soil friction. Those two are calcualted using the soil profiles in case of "boring" and are set to zero and 8 mm in case of "HDD".

Jens,

Is it possible to change the default value for UF from 8 mm to 7.5 mm (in case of a HDD), which is the average value in D-Geo Pipeline.

Ple4Win manual (version 5.5.0):
   

D-Geo Pipeline manual (version 18.2):
   
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02-07-2018, 08:43 AM,
#7
RE: Feedback: Soil friction HDD
Yes, it is possible, and no, it won't happen right now.
The reason is that we made an "educated guess" on what this value might be, just as the makers of D-Geo Pipeline. I am not sure which value is "correct".
But we hope that in the next iteration of the NEN 3650 those kind of details are mentioned (isn't Deltares involved there?). If so, we'll adapt our program to the newest version of the NEN 3650 once it it (more or less) ready for release. The same will happen with D-Geo, I am sure. At that point all three 'players' will be in sync.
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