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Assuming you want to look at global stability only, you can use failure surface limits to cause the failure to occur outside of reinforced zone.

Thanks Fattdad, very informative. I have seen diagrams of that testing procedure (Fairfax County website, I believe?) and was hoping someone would have experience with it. I imagine that 24 hour soak and 4 hourly readings could add some significant extra time and cost to the project...

Thanks for the replies. BigH, I don't think there is any reason why you couldn't perform falling head permeability testing during the initial site investigation to obtain a preliminary value. We do this frequently as part of the normal procedure for site investigations if the client knows the...

Great information, thanks. The company I work for has the double ring infiltrometer testing equipment, but we too find that it can be cost prohibitive to use. You generally need an excavator, which will be sitting around the vast majority of the time; you typically need two people; and you...

In my area, I have been seeing a lot of infiltration-based stormwater management systems being put on site plans lately. I am curious to hear thoughts on A) the role of geotechnical engineers in the design of infiltration-based systems and B) what do you think are acceptable methods of...

If you turn on "Snap Grid" in the upper toolbar and set the "X and Y grid spacing" to a convenient unit (say 1 or 0.5) your cursor will snap to the points when you are drawing in lines. I find that rounding to the nearest whole or half a foot generally provides the accuracy that I need for...

I stumbled across this and thought it was interesting: http://www.geoforum.com/knowledge/texts/broms/viewpage.asp?ID=71 I would argue that you need to go deeper than 1.5B for strip footings, but it is an interesting perspective. In my experience, having the surficial soils mapping for the...

Panars, Thank you for your excellent post. As you mentioned, since the pile is end-bearing on rock, the structural capacity of the pile governs the design. The main difference that I see between ASD and LFD is that in calculating an allowable load for a given pile section (assuming steel H...

Thanks for your responses. Jdonville, I used DRIVEN while in school and it seemed to be a very simple, reasonable, and rational program. Seems like Ohio is taking a good approach (i.e. allowing geotechs to use a familiar program). I have searched this forum for LRFD topics and have not...

I am involved with a small, municipality-owned bridge project. The structural engineer has informed us that we will be using AASHTO Load Factor Design design (per AASHTO 2002 Standard Specifications)and that review of the design will be performed by the state transporation agency. Our...

I am trying to desin a reinforced soil slope and am looking to verify my design using a slope stability program. I have tried using RSS (from the FHWA site), but it seems to be overly conservative. I designed the reinforcement in accordance with the Design Guide presented on Mirafi's website...

What are some opinions on LEED Accreditation for Geotechnical Engineers? Do you see value in obtaining accredited professional status as a Geotechnical Engineer? LEED-NC and sustainable design are now part of the curriculum for civil engineers at many four-year schools. I have looked at the...

TDAA thank you for your informative post. I think I will end up providing the lateral resistance per IBC as you have suggested. After speaking with the structural engineer again, I have determined that when referring to torsional forces, she means actual turning of the drilled pier against the...

Thank you all for your responses. I have spoken with my boss about this, but we don't do many reports for drilled piers. He is of the understanding that we have provided the required parameters. I spoke with the structural engineer who indicated that I need to give A) an allowable bearing...

Hi, I am just out of school and am working on my first project associated with drilled pier foundations for mast arms and I am wondering what I need to include for parameters in the geotechnical report. The report will be submitted to a structural engineer for design of the foundations...

Can anyone direct me to information/literature on designing geothermal heating and cooling systems?

Can anyone tell me where to find information on designing Geothermal Heating/Cooling systems?