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  • Users: RGKVI
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  1. RGKVI

    Structure footprint part sand -part clay

    If its a firm inorganic clay I wouldn't calculate for secondary compression, just primary consolidation.
  2. RGKVI

    Structure footprint part sand -part clay

    If its a firm inorganic clay I wouldn't calculate for secondary compression, just primary consolidation.
  3. RGKVI

    Deep Soil Mixing - Secondary Compression

    The design guide I use is EuroSoilStab 2002. I've designed soil cement columns in Tidal Flat deposits (Cu=10kPa) before. The method is based in a combined soil stiffness and differs totally from pile design. The only difference here is Peat suffers from secondary compression ie increase in...
  4. RGKVI

    Deep Soil Mixing - Secondary Compression

    Im designing deep Soil/ cement mixed columns (1.5m diameter) 12m deep at 2.8m centres in fibrous peat. Loading from a 10m x 10m raft foundation is 120kPa (SLS). My question is will the fibrous peat between the columns undergo secondary compression or will the adhesion between the peat and the...
  5. RGKVI

    Soil Cement Design

    UCS, CBR and PLT are all useful for verification, UCS is the go to test to get a quick idea of the undrained shear strength but elastic modulus is very conservative because the sample is not constrained. Plate load test will give good values for Modulus of subgrade reaction (good for designing...
  6. RGKVI

    Soil Cement Design

    I recommend EuroSoilStab2002 and BSEN 14679-2005. If you cant get hold of them I could email them to you.
  7. RGKVI

    Settle3D Question

    wouldn't you be better suited using bearing capacity instead of subgrade modulus (unless you are modelling a slab rather than a pad). Subgrade modulus is a measurement of displacement with load so if you have heave then the value would be shown as negative as the displacement is going up...
  8. RGKVI

    What density to use for road material if...

    Rule of thumb use 20kN/m3 to 22kN/m3 which is a bit less than concrete 24kN/m3. Bearing in mind a well graded material will be denser than single sized aggregate.
  9. RGKVI

    Drained parameters - c' and phi'

    Thanks Mike, That's very helpful and I'm going to look into the use of fully softened strength parameters which I confess I've never come across before. Every day is a school day. Regards, Rob.
  10. RGKVI

    Bowles rock bearing capacity

    2. Adverse jointing would only be applicable if the structure was founded on a rock slope / cutting where the dip angle and dip direction of the rock joint were in the same plane as the cutting.
  11. RGKVI

    Design of Solider Pile Wall

    CADS Piled Wall suite designs soldier piles and is very easy to use. It uses limit equilibrium and soil structure interaction.
  12. RGKVI

    Crane load surcharge on retaining wall

    Considering the dead and live load of the crane is only part of the problem. There will be different load cases dependent on the skew and reach of the boom. The worst load case has to be determined and designed for with a suitable factor of safety.
  13. RGKVI

    Drained parameters - c' and phi'

    Yes typically Cu values only for undrained short term modelling and phi values only for drained long term values. However effective stress triaxial test results on OC clays will often give you a c and phi value; in which case would you just use the phi value or would you redraw the failure...
  14. RGKVI

    BGS Interactive Map UK

    http://mapapps.bgs.ac.uk/geologyofbritain/home.html In the UK we have the British Geological Survey website that has an interactive map (see link above). From there you can view the superficial and bedrock geology and you can view historical boreholes for the Site you are working on. Is there...
  15. RGKVI

    Soil report bearing capacity independent of width

    The Geotech has probably an idea of the ground conditions on the site from local knowledge or boreholes logs. Example if the SPT N value is 10 in a clayey soil he may suggest the safe bearing capacity is 120kPa based on correlations between SPT N values and undrained shear strength.
  16. RGKVI

    Drained parameters - c' and phi'

    Hi guys, just wondering if anyone uses c' and phi' parameters together for design (retaining wall, slope stability etc). If so how much cohesion would you use and why if not why not. Regards Rob.
  17. RGKVI

    LPILE Soil Parameters Question - cohension/undrained shear strength

    Undrained (total stress) for clay soils in the short term (temporary works) which generally use Cu (kPa) and phi = zero. Use drained for granular soils short term and long term. Drained (effective stress) for long term clayey soils where Cohesion is usually zero (kPa) and phi is the drained...

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