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  • Users: dgillette
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  1. dgillette

    SPTs in hydraulic fill

    I'm dealing with an old (~100 years) hydraulic fill dam in a seismically active area. Among my difficulties is interpreting SPTs with very low recovery (mostly 30-50 percent, some much lower and almost none above 70 percent). The low recovery is concerning because the fines and PIs in the...
  2. dgillette

    These people must have been living right.

    http://www.bbc.co.uk/news/world-europe-25975251 Either that, or SOMEBODY up there is trying to send a message for them to clean up their act. DRG
  3. dgillette

    Choice of Nkt for estimating undrained strength of clay from CPT

    Most commonly, undrained strength, Su, is estimated as (qt - sigma-v) / Nkt. What is current preferred practice for selecting Nkt? Obviously, it depends on what strength test Nkt is referenced to, and to some extent on geology of the deposit. I usually look at Aas, Lacasse, Lunne, Hoeg in the...
  4. dgillette

    Dave Brubeck

    Has taken his last Five. He was 92. Always amazed me how he and Desmond could sound so easy and relaxed, playing in 7/4 time. Big H and McCoy - just thought you'd want to know. I got out "Brandenberg Gate Revisited" (on vinyl). I never cared for it all that much, with all the syrupy...
  5. dgillette

    Maximum strain in equivalent-linear dynamic analysis, e.g., SHAKE or QUAKE/W

    Do any of you know of any publication or industry consensus on the maximum strain for which equivalent-linear dynamic analysis can be considered valid, whether for finding cyclic shear stresses or for predicting ground motion at surface, perhaps in the QUAKE/W manual? (I didn't find it in a...
  6. dgillette

    Collapse on Wetting, Perhaps

    Got a weird one here. I'm dealing with an old dam that has shown some minor cracking recently, for which there are a couple of plausible explanations. One of them is collapse on wetting. There are three main kinds of fill in this embankment, hydraulic fill, "rolled" fill (primarily CL), and...
  7. dgillette

    Fill RD > 100% in crusher fines

    Just got off the phone with a lab guy in one of our other offices. He was confused by the std. equation giving him RD over 100%, but his CALCULATIONS are obviously correct. He reports max=104 pcf, min=92.7, and in-place=106.7. The material is crusher fines being used for pipe bedding. Don't...
  8. dgillette

    In the event that he reads this...

    ...I would like to wish Dave Brubeck a happy 90th birthday on 12/6. He's still touring, and presumably still using those bizarre time signatures that only he can make work. What's that you say? He doesn't read this? I thought everybody who is anybody does.
  9. dgillette

    Detailed l'Aquila report

    Detailed report available for download. Some interesting stuff in it on landslides and old masonry. No reports of damage to dams. http://casehistories.geoengineer.org/volume/volume1/issue4/IJGCH_1_4_1.html Those of you who also follow Seismology Engineering (moe333 perhaps), please pardon...
  10. dgillette

    L'Aquila - detailed report for download

    "Seismological and geotechnical aspects of the Mw=6.3 l’Aquila earthquake in central Italy on 6 April 2009" http://casehistories.geoengineer.org/volume/volume1/issue4/IJGCH_1_4_1.html
  11. dgillette

    Rigger acquitted of manslaughter

    http://www.google.com/hostednews/ap/article/ALeqM5i-i_kllS27ig0EMpmAJ0hqOcGgUAD9H47HD02
  12. dgillette

    Anybody going to San Diego seismic conference?

    If so, we see the faces behind the handles. [shadeshappy] DRG
  13. dgillette

    Toppled building in China last June.

    Remember this one? http://www.eng-tips.com/viewthread.cfm?qid=248426 People are doing hard time: http://blogs.wsj.com/chinarealtime/2009/06/29/shanghai-building-collapses-nearly-intact/ http://blogs.wsj.com/chinarealtime/2010/02/11/verdicts-in-shanghai-building-collapse/tab/article/...
  14. dgillette

    Heavier section for 29er wheels?

    Greetings, engineers on bikes and cyclists doing engineering. My neighbor, a rather large strong guy who is hard on bikes, recently got a 29er and almost immediately tacoed the front wheel. In theory at least, the bending moments could be larger in a 29" wheel than in a 26" wheel, but it did...
  15. dgillette

    Excavation collapse with two fatalities

    Don't know any details beyond what's in the article. http://www.google.com/hostednews/ap/article/ALeqM5ib2grNCUQNwaTTsZMzgrG46xUamwD9DTL2F81
  16. dgillette

    Stress-strain curves for cement-modified soils

    Have a project involving numerical analysis of seismic deformation of a proposed earth structure. It is to be supported in part by cement-modified soil materials. (May be flowable; may be conventional compacted soil-cement.) Know of any good references for stress-strain curves that include...
  17. dgillette

    Hey Ron (Structural)! What did we (I) say?

    It appears that the two threads in Soil Testing started by thanhynhanh have disappeared. I had answered both, then apparently he said something on CRS consolidation, then you did, then both threads were both gone before I checked my email. Never did figure out why he was interested in CRS...
  18. dgillette

    Fun with active pressure?

    This is just for fun: Wednesday night, I was raking up some river rock (GP, rounded, D50 ~1", totally noncohesive) from landscaped areas where excavation for my big wall repair is going to occur (to salvage it for later use). I was stockpiling it in a heap against the block carport wall (one...
  19. dgillette

    Clay sensitivity - strain to reach remolded strength?

    Got an interesting problem, for which I have not found a clear answer. Have to analyze seismic deformation of an embankment on a clay foundation. The clay is somewhat sensitive (mostly 3 to 4 by VST and CPT sleeve). Unfortunately, the embankment happens to be located near a subduction zone...
  20. dgillette

    Building collapse in Shanghai

    http://dcnonl.com/article/id34398 I'm struggling to figure out how the "dirt pile" would have caused the collapse, unless the piles/piers on the low side underwent bearing capacity failure, allowing the building to tilt past the tipping point. Pictures I've seen elsewhere show it on either...

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