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  • Users: Myoho
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  1. Myoho

    Immediate Settlement - Burland Burbridge

    Hi, Im writing a spread sheet to calculate immediate settlement using the Burland and Burbridge formula. However Ive come across a problem with the layer thickness correction factor, f1. The equation is as follows: f1 = H/z1.(2-H/z1) The problem is that when H/z1 > 2, you get a negative...
  2. Myoho

    Impact Loads - Navigation Piles

    Hi, I’m designing some navigation piles (free ended single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Thames (UK). The design impact load from a vessel on the river is 100 tonnes at 2.5 meters/second. However I’m...
  3. Myoho

    Impact loads - Navigation Piles

    Hi I’m designing some navigation piles (free ended, single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Thames (UK). The design impact load from a vessel on the river is 100 tonnes at 2.5 meters/second. However I’m...
  4. Myoho

    Navigation Protection Piles

    Hi Im designing some navigation piles (free ended single laterally loaded piles) to protect a water inlet structure for a water treatment works. The inlet is constructed on the River Walton (UK). I need to know the magnitude of force that the navigation piles will be subject from a stray boat...
  5. Myoho

    Base stability of excavations in soft clay

    Im trying to find the empirical equations for base stability of excavations in soft clays, devised by 'O'Rourke from his 1992 publication 'Excavation and Support for the Urban Infrastructure'. Just want the equations not the paper. Thanks
  6. Myoho

    Reduction Factors for Oedometer Settlement

    Im trying to find a reference to this subject. Can any one point me in the right direction please.
  7. Myoho

    Pile cap rebar debonded too far beyond cut off level

    Reinforced concrete CFA Piles have gone in for a structure. There is a problem. The debonding foam around the pile cap rebar has gone 600mm too far beyond the cut off level. Has any one had a similar experience before and if so you could you please tell me how you overcame it. We are...
  8. Myoho

    Slope stabilisation using sheet piles

    I have been asked to review a proposed design to stabilise an embankment reservoir using sheet piles. The embankment is about 7m high with an upstream and downstream slope of about 26 degress. The embankment material is a soft to firm sandy clay. The crest of the embankment is about 7m wide...
  9. Myoho

    Prestress Shaft Wall by Compaction Grouting around the Outer wall

    I am working on an combined foul and storm sewer outfall shaft that is subject to very large surge pressures (3.5Bar top to 6.5Bar at base). The shaft was constructed 40 years ago but since its construction the sewer network has greatly increased in size. In a storm event the surcharge within...
  10. Myoho

    Help - coefficient of earth pressure at rest

    This is a theoretical question but it is related to a potential problem with a deep outfall shaft which subject to large intermitant internal pressures. If I drill a borehole say 30m deep in sands and gravels overlain by boulder clay. Install a packer at the base of the borehole and expand the...
  11. Myoho

    How to highlight a cell giving a result greater or less than desired

    To highlight a cell by changing from black to red when daily level readings are plus or minus 5mm from the origional datum level.
  12. Myoho

    Bentonite Cement Water ratio for Inclinometer in soft to firm clay

    I have specified an inclinometer to be installed in an embankment reservoir for monitoring lateral movement. The borehole for the inclinometer shows soft to firm clay (say 45kPa). I have asked the contractor to grout up the inclinometer with a bentonite / cement ratio of 2.5:1, which will be...
  13. Myoho

    Storm water surge shaft pressure capacity

    Heres the problem, I need to analyse the pressure capacity of a 4.5m diameter concrete shaft 30m deep- ie the shaft goes from ground level to 30m below ground level. The shaft acts as a pressure chamber in severe flood conditions as part of a storm water sewer system. Modifications to the sewer...
  14. Myoho

    How do you a Import SeepW file into SlopeW

    I have carried out a SeepW analysis for the rapid drawdown of an IR Dam. I now want to import that file into SlopeW to carry out a Stability analysis. Ive looked through the manuals which confirm this process can be done but does not explain how. Ive sent an email to GEO-SLOPE yesterday but...
  15. Myoho

    Plaxis - Rayleigh beta alpha values

    I am using Plaxis V8.2 to analyse a concrete dam subject to earthquake loading. I need to input Rayleigh Beta and Alpha values. What I am looking for is a source of literature for these values. Any leads would be much appreciated. RGds, Rob.
  16. Myoho

    Microporous Loess soils

    We propose to excavate in microporous Loess soil around the city of Galati in Romania. The proposed structure is a combined sewage storage tank 25m diameter 15m below ground level. Does anyone have any experience in excavating in this type of soil and the associated geotechnical hazards. Also...
  17. Myoho

    Plaxis V8, Phi-c-reduction and Dynamic analysis

    Calling all Plaxis users out there - is it possible to carry out a Dynamic analysis and a phi-c-reduction analysis at the same time. Im carrying out some psuedo static analyses of earth embankment reservoirs. Thanks, Kitch.
  18. Myoho

    Correlation between PI and angle of shear resistance of clays

    Im after the approximate relation between plasiticity index and angle of shear resistance of clays. I am aware of the table produced by Padfield and Mair - is their anything else. Regards, Rob K.
  19. Myoho

    Plaxis - horizontal displacment

    I am modelling a sheet pile excavation. How do I model a horizontal dislacment on the sheet pile?
  20. Myoho

    How do I determine soil permeabilty from PSD curves

    I have PSD curves for a well graded glacial sands and gravels. I would like to estimate the permeability of the soil. I have tried using grading curves for using the uniformity coeficient and the D10 value. However they only seem suitable for uniform graded soils as does Hazens formula. Does...

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