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Recent content by Hambley

  1. Hambley

    mining engineer jobs?

    Yes, but most aggregates producers still think they can get by with non-existent to half-assed reserves analyses and without even minimal short or long-range planning. Even the few far-sighted producers have not been as willing to hire engineers in the past few years as they were in the late...
  2. Hambley

    Infiltration Basin

    The rate of infiltration into the infiltration trench can be calculated using the Dupuit-Forchheimer dischaarge formula for a seepage face. To use it, you need to know the head in a well upgradient from the trench, the expected height of water in the trench, and the hydraulic conductivity of...
  3. Hambley

    Visual Modflow

    I would also suggest that you have a hydrogeologist check the hydraulic conductivities, layer thicknesses, gradients, and other model assumptions. Visual MODFLOW has simplified many of the inputs to MODFLOW so that anyone can use it without being an expert in hydrogeology or in numerical...
  4. Hambley

    Compaction for waterlines

    I agree that if you are in a ROW you should use the municipal or Dept. of Transportation specs. Otherwise,judgment is in order. Most compaction specs are based on Standard Proctor; however, today, most labs use the Modified Proctor test protocol, which results in much denser compaction than...
  5. Hambley

    Dust control on gravel roads

    I agree that oil is the conventional alternative, but that it's not environmentally friendly. There is another obvious option, and that is simply water. If you are in an area where water is rationed, though, that may not be an option either. I don't think reducing speeds will make much of a...
  6. Hambley

    Stiff Clay Subgrade Preparation

    The comments about shrink/swell potential are quite valid. However, there is one question that has NOT been asked, namely, where is this facility being constructed? The reason this becomes important is that in arid parts of the country, the shrink/swell potential of clays may be irrelevant...
  7. Hambley

    epa document

    Have you checked publications on the USEPA web page, especially the OSWER part of it?? Many EPA documents are available free-of-charge if you contact them directly. Otherwise, you can be sure that it's available from the National Technical Information Service (NTIS)of the Department of...
  8. Hambley

    excavated material - weight per m3

    HI! The specific gravity of cohesive, plastic clay is typically on the order of 2.70, whereas the S.G. of alluvial clay (or more properly silt) and topsoil is approximately 2.40. One other consideration: silts and topsoil do not expand on excavation, but cohesive clays can expand up to 40% by...
  9. Hambley

    Groundwater inflow into excavations (quarrys)

    First of all, what type of rock are you quarrying and for what purpose? In sedimentary rocks like limestones and dolomites inflows will consist primarily of wwweps and seeps along bedding planes plus inflows along joints. With granites or gneisses it will be essentially fracture flow...
  10. Hambley

    Drilling/blasting in broken ground

    In other words, the problem is the holes collapsing on the drill rods so they get stuck! An answer to this problem is to use what we called auger steel at Falconbridge when I worked there in the early 70s -- weld spiral beads on normal drill rods so that you have a helical outer surface like a...
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