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Thanks for the reply. I am planning to use ASTM D6951, 17.6lb DCP for testing the subgrade. Is there a correlation as such I can use for correlating DCP resistance to friction angle? US Army has a correlation to convert DCP resistance to CBR value, however I cannot find one that can be used to...

I am wondering if there are any correlations for DCP penetration index (mm/blow) to Undrained shear strength and friction angle in Granular soils. I checked ASTM D6951 and it only offers correlation with CBR value but cannot find anything relating to undrained shear strength for clays or...

Thanks but the crane will only pass over the pipeline between the turbine locations, it won't be lifting anything

Thanks everyone for your excellent feedback. The type of crane is a heavy one used for installing Wind Turbines, the model is Manitowoc 18000. I haven't got much information other than that but a feedback that the crane will be tracking on a crane mat (12" thick) which will lead to a ground...

I am trying to evaluate the stress on a buried utility pipe (water) 6' below ground surface due to a crane walking over it. Can anyone suggest how to do the analysis?

Mr BigH thanks so much for the references. Naga

Guys: Can you please recommend me a procedure or design manual for steel pile design (for solar farm foundations comprising of C-Section profiles)with applied lateral, axial loads and moment considering the soil properties, pile geometry and active/passive earth pressures. Whats is the...

Oldest guy, thanks so much for the references NT

Guys: Can you please shed some light on to estimation of pile capacity (steel C3X6 or W6X9 sections) driven into soil. These are meant for fixed and single-axis trackers for solar panels, driven around 10-20' deep. We have bore log information (only the SPT blow counts and visual soil...

Oldest guy: Thanks for the settlement evaluation using the bearing capacity index. Let's say the soil profile has both sands/silty sands/clays. Sands/silty sands are going to undergo immediate settlement where as clays have time dependent consolidation settlement. How do we...

Guys: Thanks for your input,. Retrograde the correlation you gave 10N (Kpa), can we use this for all kinds of soils or only for sands or it can be used for mixed sands as well? NT

Is there a way to estimate the preliminary bearing capacity from SPT blow count. I am looking at a soil profile where the bearing soil is Silty Sand with blow count 7. Below the silty sand layer there is an stiff sandstone/IGM material with blow counts in excessive of 50. Are there any charts...

msucog Can you please point me to the right document from USACE? Thanks

We generally use this equation for evaluating the resilient modulus of Base material for AASHTO low volume road design. Can the same equation be used for subgrade materials? Thanks NT

Ron, does that mean we can use the correlation (2555*CBR^0.64) up to CBR of 25? Thanks NT

Fattdad Thanks for your quick response. NT

Guys: We are working on a project in Pan Handle Texas. I am wondering if there is a generalized active zone map (zone of moisture changes) for Texas. I am concerned about moisture changes in the Fat/Lean clay soils in the area that could lead to potential swell in the foundation backfill or...

For Calculating the resilient modulus of soils AASHTO recommends using Mr=1500*CBR for soils with CBR<10 Is there any correlation for soils that have higher CBR values for estimating the resilient modulus (Mr). Thanks NT

Also in the remolded state the clay cohesion is going to reduce (some times negligible). Principles of Foundation Design by B M Das is considering the effective cohesion as zero. In case if the water table is deep enough (around 25') where the pile length is only 10' can we consider the...

Sir Thanks for your input. If I understand correctly, for perimeter you are considering the dimensions of the I-section and summing it up (two times the flange width + 2 times the web height)?? Please let me know Thanks NT