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  • Users: Rakra
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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.
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. Rakra

    Effect of Moisture Content in Volcanic Soils

    Hi everyone, I have a lean Sandy SILT (ML) with high moisture content (MC) >60% and its of volcanic origin. A cathedral is to built ontop of it. As there is no depth of soil suction information for this site and no additional test data, does anyone know how I can estimate the design suction...

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