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Hi, I would like to know if the PGA map from ASCE 7/10 has a return period of 2,475 years? Thanks in advance

I'm interested in buying a pocket penetrometer so I've been searching the web and found a dial penetrometer with the following description: "...used to evaluate the angle of internal friction “j” of sandy soil and the cohesion “c” in clay soils." I thought penetrometers were used only to obtain...

Thanks Mccoy

Can someone share a spreadsheet with Fox's formula to calculate "If" or send me the original paper ("The mean elastic settlement of a uniformly loaded area at a depth below the ground surface"?)

The report states undrained strengths between 806-2218 psf (I´m pretty sure they´re correlated from spt blowcounts). Regarding changes in moisture content in the future, one of my recommendations is to take measures to avoid water infiltration. Liquid limits between 30 and 45 and plastic limits...

Just correcting, the title should say "drained clay".

According to a geotechnical investigation, we´ve encountered a 7 meters lean clay stratum with moisture contents between 9% and 14%. Which method should I use to estimate the settlement of a 4 storey building? I believe using parameters obtained from consolidation tests might not reproduce the...

I remember reading in an article that the 25 mm threshold came from observations of buildings that suffered some kind of settlement. The performance of the buildings that suffered settlements greater than 25 mm was deemed unacceptable. Is this true? Who made this observations? Terzaghi maybe? I...

I'm sorry! I meant swell factor. Th technician used to calculate the swell factor using the loose density and the 95% modified proctor density instead of using the natural density of the soil.

A client needed the maximun dry density and optimum moisture content from a borrow sample. He also needed the in situ density to calculate the swelling index, but I told him we needed to perform the sand cone or use the nuclear gauge. One of my lab technicians (really old) told me that the field...

The geotechnical investigation encountered this fill and suggested drilled shafts but the structural engineer convinced the client shallow foundations will suffice (now she regrets the decision). The fill is very heterogeneous, mostly clayey sand with boulders and was placed 10 years ago. No...

There is project were the design foundation depth was 2 m (6.5 ft). During excavation we found 7 m (23 ft) of non-controlled fill and we suppose it has at least 15 m (50 ft). One of the options was to pour concrete with crushed rock in the first 3 ft followed by an engineered fill till we get to...