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  1. Stego1

    Slab Over High Volume Change Potential Soil

    You can run swelling pressure tests on U100 samples in the lab. You may also want to have a look at the desiccation state of the clay, and what the swelling/heave potential is. BRE 412 covers this kind of thing. Also if you can get hold of 'Correlations of Soil Properties" by Carter and...
  2. Stego1

    BS5930 description of coarse grained material that have low plasticity

    Sorry I probably didn't make my point clear. I meant that when describing the soil, you don't call it a clay on account of the <425 fraction having plasticity. You call it a clay if the material as a whole behaves as a clay when you poke a finger in it or throw a lump at an excavator bucket. If...
  3. Stego1

    BS5930 description of coarse grained material that have low plasticity

    Don't forget that the Atterbergs are only carried out on the fraction that is less that 425 microns. So the PI you mention doesnt describe the behaviour of the material as a whole. You've probably had 60% of it seived out. Aren't we meant to be using the Eurocodes now anyway? ;oD
  4. Stego1

    Question on Concrete Sand Filter

    Is this paper downloadable from anywhere as I would be interested to read it? I've tried university library searches here in the UK but no joy!
  5. Stego1

    Longterm Settlement of Uncontrolled (dumped) Fill

    The BRE document should be available for download with online technical indices such as IHS dot com. Do an advanced search with BRE as publisher and 424 as document number. I just checked and found it!
  6. Stego1

    calculate landfill liner cover area

    We used to do a lot of landfill work and used a digital terrain modelling program called LSS which could calculate the difference in volume of two models.... - Model 1 is the uncapped but full landfill. - Model 2 is the final levels following capping works Subtract Model 1 from Model 2 and you...
  7. Stego1

    Existing Pad Footing Enlargement

    Hi It would probably be better to underpin the existing footings to carry the loads down to a more suitable stratum. You would have all sorts of issues to consider if you widened the existing pads such as additional settlement, uneven settlement, tie in problems etc etc. Although I suppose it...
  8. Stego1

    HDPE Pipe Electrofusion

    Temperature or presence of water may be a problem, especially if you're working around the frost line. Does the manufacturer's info say anything about working temperatures?
  9. Stego1

    Transporting peat and avoiding liquefaction

    Would you be able to dewater before excavation? Or maybe stockpile it and let it drain before moving it in dumpers?
  10. Stego1

    Percolation Test

    If you're in the UK try BS1377 or BRE 365 for falling head tests and soakaways respectively.
  11. Stego1

    FEA in Geotechnical Engineering

    Hi We use FEA quite a lot for various jobs, from large highways embankments to small footings and retaining walls. It's a useful tool but like most things it depends on the quality of data you put in and the knowledge of the operator. Most of our staff have had training but only one of us uses...
  12. Stego1

    reading of SPT tests

    I meant static cone penetration testing in the post above! Can you edit posts once posted?
  13. Stego1

    reading of SPT tests

    Why not back up the boreholes with a day's worth of dynamic cone testing? You can get quite a few down in a day and the results would reinforce (or otherwise) the SPT data. It's not too expensive either. The problem with NOT engaging an experienced geotech/engineering geologist to log the...
  14. Stego1

    Core Drilling Equipment

    Do a Google search on "P45 slope climbing rig". This is quite a good bit of kit from what I hear!
  15. Stego1

    Slope Stability Assessment in the field

    You can measure their rate of growth both across the crack and in depth. Also if there is evidence of water ingress or the potential for water ingress. If they look dodgy remember to stand upslope of them ;o) Regarding trees etc, I agree that creep can affect these in the long term however they...
  16. Stego1

    Slope Stability Assessment in the field

    Hi You can look for tension cracks and slip scarps along the top of the slope. Tree trunks, fence posts etc can also indicate past or ongoing movement. Try looking at the slope from a distance as well as close up. If you are expecting movement during your site assignment maybe you could knock...
  17. Stego1

    foundation requirement for swimming pool

    You may need to consider buoyancy of the pool when it is drained for cleaning. Also that the weight of material excavated will be roughly twice that of the water filling the void, so you may get an overall unloading condition depending on the weight of the concrete etc in the pool.
  18. Stego1

    Chemical grout to seal leaking cracks in retaining wall

    Maybe TAM crete or TAM rez. Have a look at TAM uk's website for a big list of products and applications. Remember grouting doesn't solve water ingress, but just moves it elsewhere or, as Fatdad says, builds up hydrostatic pressure. Could you not just drain the water in a controlled way?
  19. Stego1

    How to plug an artesion conditon?

    We've decommisioned redundant artesian groundwater boreholes (up to 10m above ground pressure head) before by backfilling to an agreed level with inert gravel, installing a precast concrete plug on the gravel then pressure grouting to surface (or near) and a concrete cap installed on top. Its a...
  20. Stego1

    inert landfill foundation

    UK landfill regs definition of inert waste is... (4) Waste is inert waste if— (a) it does not undergo any significant physical, chemical or biological transformations; (b) it does not dissolve, burn or otherwise physically or chemically react, biodegrade or adversely affect other matter with...

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