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Elon Musk has opined that the remains of the Key Bridge could be salvaged and used to construct a new bridge in 3 to 6 months. If Leprechauns (I'm not saying this is a realistic scenario) could unbolt all of the steel in the old bridge and gently bring the structural shapes to shore and...

Thanks for getting back to me. All of the tests were within spec for the vane rotation. The fastest one actually failed the worst. The ones that passed were all pretty much dead on 6 degrees a minute. The ones that failed were down around 3 degrees a minute. I'll know what to look for next year.

If you're required to do expansion tests you should probably do them. We wouldn't consider a PI of 9.6 to be expansive, but your geotechnical engineer didn't do Atterberg limits on the material your foundation will be resting on, so you really don't know. We have expansive shales in my area. Do...

My client is building a levee over a fairly thin (6 to 10 feet) strata of normally-consolidated very soft clay. The work is being done in stages. Settlements and excess pore pressures are being monitored in the soft clay. To move to the second stage of levee construction the contractor was...

Are you in earthquake country?

There's a thread I couldn't respond to on this subject - https://www.eng-tips.com/viewthread.cfm?qid=196797 where the general opinion was 40 degrees was as high as you should go. FHWA did some large scale direct shear testing and got more than 50 degrees - FHWA Publication No.: FHWA-HRT-13-068...

I have a project where they want to construct a fire access road around the complex using pavers over permeable base. During construction they want to use the road for construction vehicles (without the pavers). I suggested using cement treated permeable base (it's 3 sack with all coarse...

I also passed the GE exam. Like all of those tests, it's really a test of how organized your references are and how well you budget your time. My suggestion would be go through one of the GE practice tests/books and carefully index your references wrt to problem types so you don't spend any time...

You also need to have some understanding of the horizontal hydraulic conductivity. I convinced a client they needed wick drains and got 8 inches of settlement in about a week. I think they still needed the wick drains, but we could have spaced them further apart.

I was going over in my head how to explain something to non-geotechnical engineers when I realized I didn't understand it myself (embarrassing). Non-plastic silts are, imho, the worst construction material, weak, erodible, subject to collapse - assuming you won't use peat as a construction...

We did some construction work (lost money). The public agency required a performance bond on our original bid which we obtained. We eventually had a change order for about 2/3s of the original cost that they didn't require a bond on (though our contract with the bonding agency mentions that we...

The city has very thick deposits of very uniform normally-consolidated lake clay under it, so settlements are pretty easy to predict. On top of that, they're also withdrawing groundwater at an alarming rate which is causing massive subsidence.

Back in 1977 my undergraduate soils professor mentioned that there was a hotel constructed on a mat foundation in Mexico City that had two lobbies. Once the building had settled 10 feet, they started using the upper lobby. Was he pulling our legs? Does anyone know what hotel that might have...

Does anyone have any suggestions for on-line continuing education classes? I tried the Australian company (hit and miss) and CPE solutions (complete miss). Thanks

Thank you very much, appreciate the help/

Hi, Civil Engineer here, so sorry to ask a really basic question. We have a differential pressure gauge to measure the difference in total head and static head in a pipe and hence get the velocity head - we're extracting polluted air from the subsurface. The gauge is calibrated for standard...

Here's a link to the full report http://www.nyc.gov/html/dob/downloads/pdf/808ColumbusAve_ROI.pdf Everyone will be glad to hear that the geotechnical engineer was absolved of all fault. They blamed the inspector for not noticing the soldier beams were founded on sheared rock.

This is continued from the Pit Undperinning - Jacking or Shims (or none) thread Hi PEInc You bring up another issue that I've been mulling over - if you're using a trench box, when do you have to close off the ends of the box? There isn't anything in OSHA regs that directly address the issue...

Hi PEInc (love your work by the way) It wasn't my design - I imagine the designer is still being deposed so he's unlikely to opine on where he went wrong - which doesn't mean I haven't done things equally badly, just that I've gotten away with them. I'll find a link to the report when I get...

If we're sharing pictures ... this one is similar to PEInc's, but more of an "after" version.http://files.engineering.com/getfile.aspx?folder=9a8a42f0-6cdf-49ab-835f-27752af5d3fc&file=shoring_failure..JPG