Hi dears,
I had a discussion with an geotechnical expert on the parameters should we comsider for slope stability based on FHWA report NO.017
in this report it says we should consider global FOS=1.5 and also we should (as i understand) use FOS=1.8 for reinforcement and FOS=2 for bond strength...
As mentioned above by the others FOS is based on much on the situations but FHWA report for slope stability by nail suggests 1.35
and for walls with soldiers and anchors between 1.2 - 1.3, but it should be considered FHWA is normally for highways so if your going to have a deep excavation near...
Hi everyone,
We are going to stabilize an excavation using anchored wall, at depth 10m we faced collapsible soil which I think it should be loose GP withoud any cohesion, our hole length is 17m and when we drill with 10 degree slope at length 6-7 m hole collapses and it is imposible to go...
PEinc,
ALL nails in the project have minimum 9.0 bonded length, so as I mentioned above Qall= 23.5 kN/m, so as you cited if we choose 3.0m bonded
then, DTL would be 70 kN if we choose a value between 3m to 8.2(which is the maximum) for example 5.0m then DTL is 117 kN and ...
so then what is the...
Many thanks PEinc.
I agree with your commnets in regard to proof test, but the client has asked us to do some proof tests.
I am using the same manual you are using, but as you know in Appendix E it has introduced a formula to calculate DTL, and that's what I'm exactly confused, suppose we have...
Hi there,
I have a small question on soil nail test, plz help. (I would be more grateful if PEinc also comments)
for proof test FHWA says that we should calculate LBPt as greater of 3 m and 0.9*A*fy/Qall*FSproof then DTL=LBPt*Qall
for verification test is the same except FS=2.5-3 instead of...
Thanks GeoPavetraffic for your reply
Of course sb with more expreinced should design this system, I have jist joined a company and they have asked me to involved in this project and of course they would check my results, but I am here to learn more from you guys.
It is intersting for me that you...
Fattdad
I am not looking for what parameter I should use in the project I want to know the reason how an undrained condition can occure above water table and the values I put here are just for clarification of my question,
anyway I change the parameter into english units and I would be very...
hanks fattdad for your reply.
the effective strength for clay is almost the same as sand phi=28 deg and c=10 kpa but the sample was disturbed,
dont you think that c value is very small as i found in soil manual for clay with N-value more than 32 the Cu would be more than 180 kPa?
the other...
Dears,
We are going to design an anchored wall up to 36 m excavation, the soil has the following conditions:
0-10m depth clayey sand
more than 10m sandy clay
there is no water table observed.
from the top to bottom SPT-N>50 blows/30cm
direct shear test on disturbed sample shows phi=30 deg and...
Hi everyone esp. Mr. PEinc who i've learned very much from him
My question is that a contractor has performed soil nailing in a slurry soil which water level is very high. they have done 4m but they want to go down to 20m but i dont think they can do that, could you please tell me what is the...
Hi everyone
I am new to this website, i've got a question and i would be very grateful if anybody can help me.
I wanted to test a soil nail for verification test, DTL was 100 kN, Bar dia=32mm with 4000 kN/m2 yield stress and unbonded length=9m, bonded length=3m, i applied 6100 psi pressure with...
