Hello,
I've been trying to find a site from where to download the SNAILZ software program for soil nail design without success. Does anybody know where I can get it from? (I've tried Caltrans site already).
Best regards and thank you in advance for your kind help.
StructuralEngineerTX,
"My issue is that nowhere have I found something that says the bags won't eventually burst or disintegrate and hence I'm being careful by assuming eventually there will be lateral pressure on the wall."
If you use geotextile bags, it will take more than a hundred years...
FixedEarth,
It would be worthwhile for you to try and ask for an easement permission. Once you get it (I don´t see why you wouldn't), your client will be happy to hear the good news and you can go on with a more practical solution by installing your tie-backs. I mean, talking doesn't hurt, does it?
How about top-to-bottom basement walls construction? In this case, the total length of the anchors being installed at every new lift is literally within the passive wedge zone, so why should we bother in considering a free length then? When we prestress the anchor in this situation, what we are...
Thank you very much PEinc. Still trying to figure out statements like the following by Harry D. Schnabel:
"When tie-backs are used to stabilized a landslide, there may be no reason for an unbonded length. Since the failure surface is just that, it may even be desirably to bond the tie-backs on...
From Anthony D. Barley of SBMA:
"It is widely acknowledged that, in the majority of circumstances where conventional anchors are used, debonding at the tendon/grout or the grout/ground interface must occur as anchor load increases and prior to any load being transferred to the distal end of the...
As for the two-stage method you've mentioned and agreed upon (I have employed it btw), at the end we don´t leave any free length either since the strands are bare-grouted, so part of the loads will eventually be transferred to the active wedge anyway, and in that way there is a close analogy...
Thank you PEinc,
However, I'd like to hear your opinion on the practice some sub-contractors follow (including myself) of designing and testing ground anchors with no unbonded length, and being succesfull at it project after project.
As Harry Schnabel commented: "While we have not followed...
dcarr82775,
There is no way to know for sure if you can or can not work through open holes until the contractor gives it a try. Even if the drawings do not allow it, if he demonstrates in the field that it can be done, I don´t see why he should have any restriction for doing the job his own...
sadmoe,
Since Soil Nails are pasive reinforcing elements you shouldn´t worry about strucural failure caused by point loads. However, it is a good idea to "activate" these nails to a few tons of tension, which can be done with a torque wrench. You should also provide a reinforced concrete pad...
Harry Schnabel in Tiebcks in Foundation Engineering and Construction:
"We don't want any portion of our anchors to be made in the soil between the wall and the critical failure surfce. The physical significance of the unbonded length is to assure that no tendon load is trnsferred into this...
For Top-to-Bottom Basement Construction, we have succesfully completed a few projects so far installing prestressed ground anchors through these Element Walls without any free length, and then fully grouting the anchor which is prestressed to 30 - 50 t with no problem at all. We believe that by...
As for the design of the fixed length of these temporary anchors, the load transfer from anchor tendon to the ground via grout the distribution of stress along the fixed anchor is non-uniform.
As Anthony D. Barley has stated; "In the vast majority of anchors, when applying the initial load...
In this method, intermittent/alternate permanent reinforced concrete panels are placed in a down-ward process as the excavation continues, and new elements of typycal size 3 m x 3 m are installed employing one prestressed temporary anchor per panel, and constructing a stripe foundation beneath...
