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  • Users: EireChch
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  1. 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
  2. EireChch

    Earth Pressure

    Can someone tell me what k0 for normally consolidated Clay soils, in the drained and undrained condition is? TIA
  3. EireChch

    Connection of Reno Mattress to Outfall Headwall

    Hi all, See below image. Is there a standard connection detail for connecting a reno mattress (riprap apron) to a concrete headwall. The ground downstream of the outlet is sloping and I dont want any movement of the reno mattress. Have considered fixing U bars into wingwall base and U bars...
  4. EireChch

    Where is Fatdad

    Same question i posed last time re Oldest guy, where is Fatdad? He was a great contributor of soil mechanics topics. Enjoying retirement I think ?
  5. EireChch

    Baez and Martin 1992 - stone column liquefaction assessment

    Does any happen to have a spreadsheet with the above method that they wouldnt mind sharing. I
  6. EireChch

    Where is Oldestguy?

    Hi all, Oldestguy has not been on the forum in a while. I know some guys keep in contact with him offline. I hope all is ok?
  7. EireChch

    Create Raw Excel Data when Only Provided with Graph

    Ladies and Gents - is there a way to create raw excel data (i.e. organized columns and rows) when just given a high quality PDF graph. See below plot. I would like to recreate the graph in excel but done want to spend so much time in re entering data from logs?
  8. EireChch

    Use of Preliminary Test Piles as Working Piles

    Can someone tell me a reason as to why we cant use preliminary test pile (so a pile that has been loaded to 2.5 times its working/allowable load, maybe to failure, maybe not) as a working pile that will support the structure.
  9. EireChch

    Micropile Connection to 800mm thk Raft

    Hi all, I am working on a project that requires underpinning of a large structure which has settled excessively. We are asked to evaluate the use of micropiles to support the 800mmthk raft. Approx 1000mm of earth fill and a 200mm thk floating slab sit above the raft. The 168mm dia micropile...
  10. EireChch

    Bearing Capacity - Unusual Case

    Hi All, I have had a request land on my desk where a structural engineer needs a bearing capacity assessment of a foundation where the ground surface profile changes over the width of the bearing capacity failure wedge. I have indicated that the exercise is pointless as a 6m wide foundation...
  11. EireChch

    Statistics

    Interested to know what people’s take on statistics is? Do many engineers use it on a day to day basis? Does it reduce the need for engineering judgement? An older engineer has told me that while engineering judgement is important, it is becoming less acceptable these days. I have used it...
  12. EireChch

    Pipe Stress

    Hi all, I need to work out the strap stress acting on a PE pipe. The pipe is 2.5m in diameter and placed on the seabed. The purpose of the strap is stablise the pipe against wave and buoyant forces. The strap is fixed to a concrete block either side of the pipe. Its an unusual temporary...
  13. EireChch

    Concrete Ring Wall Foundation for Tank

    Hi all, The project is a retrofit of an existing 12.8m high x 48.9m dia tank supported on a 0.45m wide 2.3m deep ring foundation. Due to the retrofitting there will be an increase in loads. I am doing a check to confirm the existing reinforcement provided is sufficient. This involves revising...
  14. EireChch

    Structural v Geotechnical Forums

    I think most of the people that use this site come to discuss, learn, debate, argue, etc about geotechnical engineering. Its a great website that I dont feel guilty spending hours on. Better than spending hours looking at VR fail videos on Youtube (check them out, very funny, a personal favorite...
  15. EireChch

    Gneiss Rock

    Hi all, Has anyone used Gneiss as an aggregate for structural fill? If so, is there any good FHWA literature on the material, which discusses its typical aggregate values like LA fragmentation, crushed and rounded particles etc. I have seen online that LA for Gneiss can range from 30-60. The...
  16. EireChch

    Stability of Breakwater

    Hi all, We are looking at a Breakwater, approximately 9m high with 4m above HAT plus climate change level. Hydraulic stability assessment requires rock sizes of up to 10-15 tonnes. We have been asked to provide a preliminary assessment of seismic stability of the breakwater. To do this we...
  17. EireChch

    Compaction level reduces with moisture content?

    Hi all, I am working on a project where there is a debate as to how the material was QA/QC'd to 90% compaction (standard proctor), however after settlement of some infrastructural, the compaction level is ~80%. The material is well graded sand with trace fine gravel. One theory being floated...
  18. EireChch

    Subsea pipeline - Pipe bedding and backfilling material

    Hi all, We are undertaking a preliminary assessment of a subsea pipeline located in 6m depth of water. The pipe will be trenched into very weak rock. I am looking for some references/codes to specify the pipe bedding and backfilling material for subsea pipes. Client hasnt confirmed what the...
  19. EireChch

    Groundwater level rising resulting in Heave

    Hi all, A bit of a trivial question..when the groundwater level is lowered (for whatever reason), a foundation resting on sand should suffer some additional settlement due to the increase in effective stress. When the groundwater level rises (again for whatever reason), there is a reduction...
  20. EireChch

    Settlement of Large Mats / Rafts

    Hi all, Settlement related query again... Interested to hear peoples thoughts on settlement calculations for large rafts/mats/slabs on granular soil. The company where i work now considers a foundation a raft where b x l is greater than 5 x 5m. Elastic theory is then applied using the...

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