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Recent content by geotechengineer1

  1. geotechengineer1

    undrained vs. drained soil condition

    Drained : Excess pore pressure has dissipated Undrained : Excess pore pressure has not dissipated
  2. geotechengineer1

    Fine grained soil Behaviour based on permeability

    So for 29m piles with a water table at 40m, how much excess pore water pressure will be generated during loading
  3. geotechengineer1

    Thoughts on the usefulness of the USCS and it's derivatives

    Fatdad, the USCS makes the distinction between gravel and clay based on weight percentages and between silt and clay based on nonsense.
  4. geotechengineer1

    Thoughts on the usefulness of the USCS and it's derivatives

    According to the USCS a high plastic clay constitutes 'silty fines' as long as it plots below the A-line.
  5. geotechengineer1

    Subgrade Reaction Method for Retention Wall

    Have you tried the wallap manual? I know for alot of other geotechnical software there is a theory manual which explains everything
  6. geotechengineer1

    Recommended read on consolidation

    Intro to Soil Moduli Briaud John Atkinson Non Linear Soil Stiffness Any basic geotechnical textbook section on Consolidation - Das Fundamentals of Geotechnical Engineering, Craig's Soil Mechanics, VNS Murphy, etc. FHWA Site Investigation Manual, Chapter 6 Navfac Soil Mechanics, Chapter 5 and...
  7. geotechengineer1

    Pile drilling rigs maintenance

    This isn't drilling rig related but for driven piling rigs I noticed that anything electronic / sensor based was the most difficult to repair on remote field jobs. Easy things to repair are anything that's similar to what the crew plays with in their garage or on the farm. Eg. a diesel piling...
  8. geotechengineer1

    Over-consolidation in soft clay soils

    Well, you need to get advice from a senior engineer at your firm for a calculation like this. Personally I do not like using Cc and Cr. Rather, I would use the results of the oedometer to determine a constrained modulus that is appropriate for the stress range of the current loading + the...
  9. geotechengineer1

    bridge abutment settlement

    To determine where you can drill, think about the zone of influence of your foundation (using a 2V:1H load distribution or whatever you prefered method is). You should find that it is not absolutely necessary to drill through the abutment itself. Some testing ideas: CPT's, particularly with...
  10. geotechengineer1

    Depth of borehole in soil and rock

    In the past I've used 3m as a minimum, but this was primarily for economic reasons (winning jobs), and the risks associated were managed with absurdly conservative parameters. In glacial areas you can have rafted / floating chunks of bedrock above the actual bedrock surface. British engineers...
  11. geotechengineer1

    Over-consolidation in soft clay soils

    There are two possible pathways to answer this question: One is that the preconsolidation-overconsolidation concept is just a manipulation of data using log scales and the idea that engineers can elucidate a 'preconsolidation pressure', at least in that the idea that you can plot some oedometer...
  12. geotechengineer1

    Unsaturated Soil Mechanics Applied to Slope Stability

    https://www.amazon.ca/Unsaturated-Soil-Mechanics-Engineering-Practice/dp/1118133595/ref=sr_1_1?keywords=unsaturated+soil+mechanics&qid=1580967089&sr=8-1...
  13. geotechengineer1

    How much does a residential house weigh?

    Who knows! In Canada, structural engineers told me ~50 kN/m on exterior footings. In New Zealand they tell me it's 10 kPa per floor on the footings, regardless of the footing width or the area supported by the footing.
  14. geotechengineer1

    Does Structural Engineering Need to Be More Specialized.

    I've often thought the same thing about geotechnical engineering. If you took out some of the other civil courses you could do a 4 year degree including all of the course-based content from a master's program in geotechnical engineering. I'm expecting that within my life time at a minimum a...
  15. geotechengineer1

    Lightweight polystyrene fill for flexible pavement subgrade

    Not personally but I know in Alberta EPS fill has been used on a couple of highway projects in muskeg / soft soils, Highway 43 and another one I can't remember. I think they actually had the EPS buried under a meter or so of soil due to frost concerns though not directly as the subgrade. I was...
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