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  1. toolpusher

    Silt-Clay Testing: What approach do you use?

    Cmorgh / Coneboy, I have used CPTint 5.0 for many years, which I got from Prof. Campanella at UBC (call Scott Jackson at 604-822-4143 for info on how to get a free copy). It is a DOS-based program and does not work very well in Windows XP, so you will likely need to run it on an older OS. It...
  2. toolpusher

    seismic activity and undersea slope stability

    rennkafer, The evaluation of slope stability and potential lateral displacements under seismic loading is a challenging task. In cases where there is little or no geotechnical information available for the seafloor sediments, then you are going to be incapable of arriving at any reliable...
  3. toolpusher

    Use of wa x for undisturbed samples (shelby tube/block sample)

    I have worked in offshore soil investgations for 20 years and we have determined that a 50-50 mix of refined beeswax and paraffin, works well at making sure that the wax doesn't shrink away from the inside of the shelby tube and that still allows it to be dub out by hand fairly readily. If...
  4. toolpusher

    Silt-Clay Testing: What approach do you use?

    Coneboy, I have had better success using the excess pore pressure response than the tip resistance, in very soft clayey or silty soils. I work a lot in the offshore and this is usually the case at the seafloor. The various Su/P methods work well at estimating OCR in soft NC to lightly OC...
  5. toolpusher

    CPT's in peat

    JWD46, One other problem with trying to interpret CPT results in peats is that once you get through the fibrous cap, you typically encounter an "amorphous" or decayed organic zone beneath. This often is very weak material and is not soil at all, but material that looks black and...
  6. toolpusher

    Engineering Properties - Peat

    Do not rely on any "undrained" measurements made in fibrous peat - they are completely meaningless in terms of its real behaviour. The comment about looking at the decomposed layer immediately below the fibrous zone is very important - you will usually find that this is the weakest...
  7. toolpusher

    Anteus A-1 Consolidometer

    The Anteus A1 consolidometer was a prototype design manufactured long ago and has been replaced by more modern units sold by GeoTest. It was not designed to do CRS testing, but it should be possible to add the needed extra sensors and a loading-feedback system. I used 2 of these units in my...
  8. toolpusher

    Electric Logs

    Pigdog If you are drilling a borehole you can always run downhole tools inside the hole, if you install plastic casing after the hole is bottomed. Doesn't take much extra time and you benefit by being certain of where key horizons are, as downhole logs don't lie (they can mislead sometimes, but...
  9. toolpusher

    CRS vs Icremental Consolidation

    There is no question that secondary consolidation effects can lead to reduced void ratios in the standard (incremental) oedometer test, wherein typically the load is left on for a specific period of time. There has been a considerable amount of work done to identify the amount of primary and...

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