SNAILZ
SNAILZ
(OP)
I am having a debate with another engineer on using SNAILZ as part of a soil nail wall design. If I use the pre-factored strengths and bond reduction of 0.5 I get a factor of safety of 1.0. To me this is too low. The wall is permanent. The other engineer says 1.0 is ok because the strengths are already reduced thus F.S.=1.0 is the target, not the 1.5 I think it should be.
I am looking for thoughts on which one of us is right (or more right than the other anyway)
I am looking for thoughts on which one of us is right (or more right than the other anyway)





RE: SNAILZ
RE: SNAILZ
If you use ultimate values, they will all have a safety factor equal to the final safety factor that is calculated by the program. For instance, if you enter an ultimate bond, yield stress, cohesion, and punching shear and the program calculates a final safety factor of 1.5, then you have only a 1.5 safety factor on the input strength parameters. I really do not see a reason to use ultimate values in SNAILZ.
For bond stress, I enter a prefactored bond stress that already has the safety factor I want (usually FS = 2). Then, if I want to modify input for different nail spacings or hole diameters in different tiers, I use the bond reduction factor for that particular tier of nails. If I want to double the horizontal nail spacing, I enter a reduction factor of 0.5. If I want to reduce the drill hole diameter from say 8" to 4", I would doo the same to account for the smaler hole perimeter.
www.PeirceEngineering.com
RE: SNAILZ
RE: SNAILZ
www.PeirceEngineering.com
RE: SNAILZ