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  1. brotherson

    Active earth pressure and sliding of a buried structure

    haha kootk, I may use that in my next discussion! thanks for the responses everyone.
  2. brotherson

    Active earth pressure and sliding of a buried structure

    dcarr1: It's a portal frame and buried. Under dead load, the walls bulge out for the deflected shape. With the introduction of earth pressure, the deflected shape is still outward so I can't use it as an argument. Kootk1: This is the way I think of it but unfortunately patronising them may be...
  3. brotherson

    Active earth pressure and sliding of a buried structure

    It is theoretically free to move. It is not a box it is an integral portal frame on strip footings. Both footings are being used to resist sliding and the structure is designed to make sure the load distribution is catered for. There are other forces driving the sliding other than earth...
  4. brotherson

    Active earth pressure and sliding of a buried structure

    Hi I've got a buried structure designed to BD31/01. It is currently designed for Ka as the driving earth force. BD31/01 clearly requires the use of ka in the sliding (ULS) check. There is a discussion with the independent checker who has decided the structure is sliding. He is using k0 (at...
  5. brotherson

    Waterproofing membrane under portal frame foundations and sliding

    Thanks for the replies all. Working from multiple angles. Jed - there are no carpets. They are strip footings on a portal structure. They shouldn't need waterproofing but it's a project requirement - blanket statement for structural elements below ground level. darthsoil - looking into a...
  6. brotherson

    Waterproofing membrane under portal frame foundations and sliding

    Thanks for you response. I'm told it is a mandatory requirement on this project but I'll look into that further. The water table is 30m below existing ground, we're surrounded by sand and it rains once a year. However I've been here in the middle east for 1 month and I've already learned to...
  7. brotherson

    Waterproofing membrane under portal frame foundations and sliding

    I'm working on a project where the independent verifier has called into question the sliding resistance of one of our structures as our footings are on a waterproofing membrane. It is a portal frame type concrete structure on engineered fill with a friction angle of about 35 degrees. Our...
  8. brotherson

    Foundation for a big rock

    Hey there Thanks for the additional replies, I didn't realise they'd been made! bookowski - The rock sits upright pretty well on its own, but wouldn't take a huge amount of effort to push over. Hence the concrete footing. Instead of drilling into the base (vertically), I'd put a dowel bar in...
  9. brotherson

    Foundation for a big rock

    Probably! It's to be a memorial stone with a plaque to be put up in a public place so it needs to stay upright. It'll have to put up with wind really and no doubt there will be the odd reasonble effort to push it over. I wouldn't have to account for the odd motivated vandal with a backhoe but...
  10. brotherson

    2" non-structural topping mix

    I would have thought that's exactly why you need reinforcement. Reinforcement will give you a degree of control over the restraint cracking, with the reinforcement holding the cracks together. You end up with a larger number of smaller cracks instead of a few huge ones. If the cracks need to be...
  11. brotherson

    Foundation for a big rock

    Thanks for the response. If there are any other comments from people with any experience about this it would be good and failing that I'll see what I can do about a stone mason. Cheers.
  12. brotherson

    Foundation for a big rock

    Just wondering if anyone has any ideas for anchoring a big rock (like a memorial stone) It's about 1.5 tonnes and the base is about 700x700mm. It tapers smaller in the vertical direction. It's about a metre high. It's quarry rock so the surface is quite uneven. Best I have so far is to drill...

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