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  1. EireChch

    Waler Connection

    Thanks gents
  2. EireChch

    Stepped Cantilever Retaining Wall

    your approach for the tiered walls is right, just apply the weight of the wall above on to the lower wall and design accordingly. You seem to have lots of embedment depth which is a help, is this correct, or just indicative? You could look at using modular block walls like ALLAN block or...
  3. EireChch

    Modular Block Wall With Geogrid Into Bedrock

    When I said pin it to the wall I meant a bodkin type join which is more or less the same as a pipe anchor. Hooking the individual cells to a single point etc would definitely be a bad idea. If you are confident in pinning/fixing the geogrid to the rock face then you must be sure it’s stable...
  4. EireChch

    cohesion based on SPT N-value

    anytime your talking about cohesion you need to specify drained or undrained. Undrained cohesion can be estimated by strouds correlation and others similar to it
  5. EireChch

    Modular Block Wall With Geogrid Into Bedrock

    I cant see why drilling and grouting a hook into the rock isnt possible. Its unusual but can be designed and detailed properly . You could go down the other route in assessing reduced pressures due to the presence of rock within you Ka wedge.
  6. EireChch

    Waler Connection

    Has anyone got any good pictures of waler beam connections, and also walers connected to a very non straight run of sheet piles. Putting together a presentation and need inspiration. TIA
  7. EireChch

    The minimum number of piles required for static load test

    Sorry I completely mis interpreted your question. In the UK, there is no minimum standard on number of piles to be tested. For a lot of projects, static pile testing is too expensive given the size of the project and and cost of testing. Generally it developed on a project by project basis...
  8. EireChch

    Sheet Pile Design - Causeway with Tire Pressures as Strip Loads, Retained by SSPs, and Faced with Concrete Blocks

    yes, still applicable. The theta c angle is a function of the passive soils friction angle. The berm above is completely separate to it. It could be concrete, rubber tyres etc, all we are concerned with is the weight it provides.
  9. EireChch

    The minimum number of piles required for static load test

    There is no real minimum etc. Its all about the reaction you need. If you get it from 2 piles, no reason you cant use just 2.
  10. EireChch

    Sheet Pile Design - Causeway with Tire Pressures as Strip Loads, Retained by SSPs, and Faced with Concrete Blocks

    The blocks are acting as a berm to the wall. It would be far to conservative to not consider any support from them. I can see why the contractor wouldnt be happy. Pick up a copy of CIRIA c760 and read the section on berms and how to consider them in your analysis.
  11. EireChch

    Dodgy parameters?

    I think your gut is right. Mudstone, and most rocks are typically designed as drained materials. Provided the material is jointed, you can use the Hoek Brown criteria to calculate drained parameters. For a mudstone, id guess something like phi of 28 degrees, c' 50-100kPa. Thats a big shot from...
  12. EireChch

    Lateral earth pressure at rest for a standing cliff

    Very true GAC - its a global stability problem first, then a retaining wall design.
  13. EireChch

    Lateral earth pressure at rest for a standing cliff

    you dont describe SAND as stiff, granular soils are referred to as loose to very dense. You most likely have a cemented SAND or SANDSTONE, a CLAY would not stand 27m high for 10 years. A cemented SAND would be better called an intermediate geotechnical material as its between a soil and rock...
  14. EireChch

    Water Table and the Capillary Fringe

    just assume 17*2.5, dont over complicate it. Check Das book on Foundation Engineering and Geotech engineering, it has a very good illustrative examples of what to do with water table. ps- I never use saturated or dry unit weights, I typically just go with above or below the water table. Most...
  15. EireChch

    Wooden retaining wall with dead man anchoring

    what type of wall is it? upload pictures and a cross section/sketches You cant just assume 14 deg, without knowing the actual angle, you will need to do a sensitivity check and pick worst case
  16. EireChch

    Negative Cohesion Component Value for Active Pressure

    In cohesive soils, the near surface soils are in tension so your math is correct. Have you ever walked in an area of CLAY and noticed desiccation and tension cracks. The tension cracks form due to the negative earth pressure. It essentially means that they have some stand up time. horizontal...
  17. EireChch

    Moisture content of subgrade/subbase for next layer

    In my world of earthworks, the only thing that permits you to place more fill material (pavement or general fill) is whether you hit your 90-95% density target and either an undrained shear strength or CBR target The reason we use dry density, it that it is irrespective of moisture content...
  18. EireChch

    Auger cast pile with no rebars

    But there will always be some moment that has to be considered due to eccentricity of axial load.
  19. EireChch

    Equations for Strip Surcharge Loading Inconsistencies

    sorry will look in more detail when i get a chance. but I do remember and thread where Fatdadd (forum member) as commenting about the need to double the earth pressures estimated similar equations. ill try did it out when i get a chance
  20. EireChch

    Clean structural fill

    The odd rootlet or branch is acceptable, they can be hand picked out. The materal in your pics is not acceptable, even if the came back with an organic test saying less than 3% I would not accept it. Also it’s normally % weight not volume. You can’t measure organic volume in a lab

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