LRJ - That's kind of what I was thinking. I am trying to develop general guidelines for pipe installation and so am not looking a specific soil data. Rather I'd like to provide guidance on how to approach installations depending on soil type. Would you think anisotropy is mainly a concern in...
Sorry about that OG. I realized this forum (mechanics) would probably be better suited for the topic. The other one has been deleted.
Any advice on the question at hand?
Does anyone know if the constrained soil modulus (Ms) used to compute deflection of buried flexible pipe (Spangler's formula) is the same Ms used in settlement/consolidation analyses? The buried pipe calculation is detailed in AWWA manual, AASHTO LRFD, etc.--a screenshot of the AASHTO...
I appreciate the responses.
cvg - You're right that this type of pipe is generally not pressure rated. However, that doesn't seem to always be the case. Check out the link below for a similar product. We're looking at pipe with ID 24" up to 60", so for relatively low-pressure applications with...
Hey LittleInch,
That's exactly the type of pipe I'm talking about (thanks for the picture). We are interested in using it in low-pressure applications (<20 psi), specifically for irrigation conveyance.
D2837 defines "long-term hydrostatic strength" as the tensile hoop stress in a single wall...
Hi all,
I'm working on a project that's a little out of my wheelhouse--looking for your insight on appropriate method. I am trying to develop a service life (50 year) Pressure Rating / Pressure Design Basis for a large diameter, corrugated, double-wall thermoplastic pipe (HDPE). Due to the...
Thank you, both. I agree with BH--what's the point of continuing to drill if you provide no additional information? Changing the hatching and giving no description raises more questions than it answers haha. Oh well is right.
My thought was it is weathered rock or some sort of rocky fill, based...
Hi all,
I have a set of boring logs from a site in Quebec (so in French), which have a soil description I have never seen. In multiple logs a stratum is simply labeled "destructif" with no SPT results or additional notes. The hatching shown looks like clean gravel or cobbles but I am hesitant...
Hey J,
At this point are you set on the pre-load approach or have you looked at other types of ground improvement? My understanding is in peat 50% or more of total consolidation can be secondary(depending on fiber content, etc.) And since it sounds like your peat layer varies in thickness under...
With deep peats, do you also need to consider long-term settlement from the decomposition of the organic fraction?
Another thought, if the concern with secondary consolidation is differential rather than total settlement perhaps this can be addressed with layering geogrid in your fill and/or...
OG - that's direction we've been leaning. Limited over-excavation of the expansive soils where encountered below the shallower manholes and a low-permeability backfill material to prevent draining surface water and shallow groundwater to the underlying expansive material. The concern I have with...
CVG - You're totally right. Unfortunately the organization of the project team is a little convoluted on this one, so I'd like to wrap my head around the issue before speaking directly to the geotech and eventually to the contractor. I'm not making any final decisions based off what I get from...
OG - That is a great suggestion. I've reached out to the local utility to see what advice they may have.
jmcc - The job's near Tallahassee. My firm is out of state, so we have little to no direct experience with the local soils. Any insight you have on the clays in this area would be a huge...
Thanks for the quick response Fatdad!
I do not know the mineralogy of the site soil (perhaps I can track this down somewhere). However, the geotech report I have provides foundation recommendations for the proposed development--all 2-3 story apartment buildings. They recommend shallow...
I am working on design and construction recommendations for a series of HDPE manholes installed in expansive clays. As far as I tell, there are many posts on this site about shallow foundations over expansive soils, but nothing yet about buried structures like manholes, pipes, tanks, etc. I am...
