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Recent content by ashjun

  1. ashjun

    Active Pressure Combined with Water Pressure

    sorry for the typo error; it should be "..which cite measured earth pressure to be less than that at rest"
  2. ashjun

    Active Pressure Combined with Water Pressure

    Hokie66 I am surprised at the simple conclusion you have drawn in your post. Please look at some of the research papers which cite active earth pressure actually measured to be lower than developed from the Rankine theory.
  3. ashjun

    Active Pressure Combined with Water Pressure

    herewegothen Your solution is correct. You would use at rest pressure only under situations when (in addition) tie-back or struts are used to retain the earth
  4. ashjun

    What to do, what to do

    Have you tried for a higher degree? See if you could take time off towards the end of the year. Any enhanced technical skill would improve your chances for the next job Cheers
  5. ashjun

    Type of Clay from Atterberg limits

    Hi, To evaluate the time of clay can I presume you are interested in the swelling potential. You need one more parameter in addition to the atternerg limits - which is the percentage clay content. Do a quick search on activity (defined as plasticity index divided by the percentage clay...
  6. ashjun

    Vs30 & Nspt

    Hi italicus You are correct when you use N60; that is apply "necessary correction" to the observed N value to make it "realistic observed N value" at 60% applied energy. This is probably because most of the field SPT values all over the world are now related to each other at standard N60 energy...
  7. ashjun

    Vs30 & Nspt

    Hi, Your views sound interesting. Would you please expand on the Vs30? I am not sure what it means. Last month I was given a small assignment on the evaluation of volume of grout mix gone under a viaduct which runs over the new proposed underground in Italy. The project is near Bologna for...
  8. ashjun

    Minimum Pile Length

    Hi again, Yes, it all depends upon the minimum cost, the availability of equipment and the experience of the local engineers amongst other factors.
  9. ashjun

    Minimum Pile Length

    hi, socket length is the length of the pile embedded in rock or refusal strata. Rgds
  10. ashjun

    Minimum Pile Length

    I am not exactly sure of the answer since it has been a long time that pile designs have actually been given to me. However, in foundation engineering, I did study that if the piles are designed as friction piles, then the length should be at least 5 times the pile diameter - any length less...
  11. ashjun

    The use of Ultimate Limit States in Bridge Foundation Design

    I dont know if this is the case, but just a thought. For the design of pile mat (that is a temporary raft over the ground so that rigs can be driven over them safely) the design usually accounts for the factored load (factor applied to the rig load, critical position, etc.) while the soil...
  12. ashjun

    swimming pool liquefaction foundation

    Hi, I defer. The pool house would be designed for structural settlement of 25mm or so; however, the pool itself would be designed for zero settlement - remember, the water in the pool is replacing the soil, and hence the foundations under the pool are likely to be under stressed. Thus it is...
  13. ashjun

    U of Minn Geotech Conference

    Anyone attending the Rankine Lecture this year? Its free to attend! http://www.britishgeotech.org.uk/meetings/230305.pdf Would be good to meet one of you guys Rgds
  14. ashjun

    Ground Subsidence in Shanghai

    I am not sure either, read a news item in the bbc archive; the reason given was because of massive skyscaper construction over the last decade or so.
  15. ashjun

    Ground Subsidence in Shanghai

    The ground subsidence at Shanghai (about 11-15mm/year) has been related to the number of high-rise buildings that have come up in the city. If that is the case, then is the ground failing? Or otherwise, is it related to the large scale water extraction? Is there any expert from that area who...
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