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  1. Rakra

    FoS used without consultation

    Thanks everyone for the prompt responses, they've been helpful and highlight the need to be careful in what we report. The design is still underway and the structural engineers have adopted the FoS of 2.0 in their design but are now having to change their design if that is not the case. Yes, we...
  2. Rakra

    FoS used without consultation

    We prepared a geotechnical engineering report and in it we put some general blurb on pile design definitions and methods which the client adopted as the FoS / provided to third parties for use in pile / foundation design. We were not aware and have only just been made aware after questions were...
  3. Rakra

    Coastal site with artesian conditions and mixture of cobbles/boulders and soil

    Hi everyone, thanks for the prompt responses. @MTCN, foundations are going to support a wharf and jetty. @oldestguy, thanks for the tip. Having not used geophysical data prior, I am just going off what i've come across in the literature @SlideRule, thanks for that feedbac. Actually 4 piezoes...
  4. Rakra

    Coastal site with artesian conditions and mixture of cobbles/boulders and soil

    Hi Everyone, My site is a coastal site with the following prevalent geotech conditions (established by drilling and test pitting): 1. Sandy silt and clay, peat alluvial sequences (up to 5m depth)overlying unconsolidated sands and gravel dominate soils and also mixture of cobbles and gravels...
  5. Rakra

    Unconsolidated gravels, cobbles, boulders - Coastal Wharf project

    Thanks Mad Mike for the reply. Sorry yes should have clarified. Yes was referring to SPT refusal on cobbles/boulders. with regards to the size of boulders, how to determine size if boulder is larger than HQ size? Secondly, the boreholes were targeted to terminate at 30m depth. There is lack of...
  6. Rakra

    Unconsolidated gravels, cobbles, boulders - Coastal Wharf project

    Hi everyone, I have a site with about 5m thick Silty Clay / Sandy Clay overlying Unconsolidated gravels, sands, cobbles/boulders. We did drilling (wash boring and HQ coring) with SPT, most refusing on cobbles/boulders at depth. size of cobbles/boulders is unknown. In addition, the unconsolidated...
  7. Rakra

    Foundation on recent volcanic soils

    Thanks everyone for the responses. @oldestguy - I was also thinking along those lines, excavate out insitu and backfill with suitable material. The volcanic soils are recent unconsolidated ash deposits from nearby active volcanoes, with depth of these volcanics estimated persist to around 20m...
  8. Rakra

    Foundation on recent volcanic soils

    Hi Everyone, I'm seeking recommendations for foundation types on very loose to loose volcanic soils (Silty SANDS/Sandy SILTS) with low bearing pressures - <50kPa (as deduced from dynamic cone penetrometer), where the water table/sea level (site is about 1km from sea) is around 3.0m depth...
  9. Rakra

    Foundation on high plasticity clay

    Hi all, lab results indicate the clay with shrink/swell of 0.5, c'of 14kpa, effectivef riction angle of 22°. Clay from 0 to 4.5m followed by XWvery low strength mudstone. Clay is stiff to very stiff. Groundwater depth possibly 3m below ground. Any comments about foundation type to.use? Am...
  10. Rakra

    Review of Geotech Report

    Hi everyone, thanks for your feedback and advice. At least we now know the verdict on this. But oldestgyr if you do know of groups that do so in other forums, please share.
  11. Rakra

    Review of Geotech Report

    I am just curious if there is a group / person who reviews geotechnical reports for free as a way of sharing their experience and knowledge on this forum. Please advise.
  12. Rakra

    Foundation on high plasticity clay

    Thanks everyone for your comments and discussions. I am awaiting some lab results so will come back with more once I get those. sorted. At this stage, what hookie66 and BigH have suggested (bored piles) seem applicable in this case.
  13. Rakra

    Foundation on high plasticity clay

    Can someone share their experience of foundation types for a 4 storey (with basement) to be built on a site with about 5 to 6m of alluvial high plasticity clay overlying weathered calcareous rock (7 to 10m) followed by HW calcareous rock. The clay are being tested for shrink/swell properties. We...
  14. Rakra

    Soilder Pile Design - Spacing

    @ PEinc and JedClampett - Thanks for your feedback, much appreciated......The structural engineer in this instance was trying to get us to confirm if he could use the material properties we had provided in his retaining wall design even though we had supplied the recommended values already in...
  15. Rakra

    Soilder Pile Design - Spacing

    Can someone provide advice on the use of material properties (friction angle, unit weight)of the retained material to determine lateral spacing of soilder piles? The structural engineer in this instance is asking if the material parameters we have provided can be used to determine the maximum...
  16. Rakra

    If client wants additional geotech information, should we charge them?

    Thanks everyone for your comments. @BigH...Yes, these are outside our original SOWs. We were only asked to providing Geotechnical parameters for retaining wall design, not the design or type of retaining wall. The structural engineer decided to use soilder piles and shotcrete. I think I'll...
  17. Rakra

    If client wants additional geotech information, should we charge them?

    We have just provided a Geotechnical Report to client for a 5 storey building. Now the client's structural engineer has come back with requests for geotechnical advice on soldier pile and shortcrete for use in a 4m high retaining wall. They want us to confirm maximum pile centres with respect to...
  18. Rakra

    What Equipment to excavate rock and best type of foundation

    What type of equipment is available for use to excavate a rock with UCS rock strenght of 3.5MPa? Its a calcareous siltstone with cherty nodules. Secondly, most of the site has bedrock at surface. I'm thinking either pad or strip footing with minimum embedment depth of 0.5m into the compentent...
  19. Rakra

    How to obtain Surface movement and depth of suction change values

    A client is requesting for precise values for ys = characteristic surface movement and Hs = design depth of suction change. The project is a 2 story office/warehouse (with lightweight floor and wall construction) on highly expansive clay soils. The location of the project is in Port moresby...
  20. Rakra

    Effect of Moisture Content in Volcanic Soils

    Thanks BigH and oldestguy for your comments. Regarding BigH reply, no sorry I left out the word 'be' after 'to built' in my initial query. The cathedral has not been built as yet. The geotech investigation was done at the proposed site and due to lack of available geotechnical data within the...

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