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soil stack

Soil mechanics is a branch of soil physics and applied mechanics that describes the behavior of soils. It differs from fluid mechanics and solid mechanics in the sense that soils consist of a heterogeneous mixture of fluids (usually air and water) and particles (usually clay, silt, sand, and gravel) but soil may also contain organic solids and other matter. Along with rock mechanics, soil mechanics provides the theoretical basis for analysis in geotechnical engineering, a subdiscipline of civil engineering, and engineering geology, a subdiscipline of geology. Soil mechanics is used to analyze the deformations of and flow of fluids within natural and man-made structures that are supported on or made of soil, or structures that are buried in soils. Example applications are building and bridge foundations, retaining walls, dams, and buried pipeline systems. Principles of soil mechanics are also used in related disciplines such as geophysical engineering, coastal engineering, agricultural engineering, hydrology and soil physics.
This article describes the genesis and composition of soil, the distinction between pore water pressure and inter-granular effective stress, capillary action of fluids in the soil pore spaces, soil classification, seepage and permeability, time dependent change of volume due to squeezing water out of tiny pore spaces, also known as consolidation, shear strength and stiffness of soils. The shear strength of soils is primarily derived from friction between the particles and interlocking, which are very sensitive to the effective stress. The article concludes with some examples of applications of the principles of soil mechanics such as slope stability, lateral earth pressure on retaining walls, and bearing capacity of foundations.

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  1. C

    Soil stack woes

    Hi, Newbie desperate for some advice :confused: I'm trying to fit a Bath waste into the soil stack. Bought a normal strap connector and opened up the panel around the stack, only to find that the soil pipe is in a corner and hard against two walls. Did some Internet browsing and found a...
  2. H

    Soil stack venting

    In a two storey house with a single soil stack can the "vent" portion of the stack above the highest inlet be reduced to 50mm? Have seen so many conflicting views when trawling the internet but no definitive answers. A customer wants a bathroom changed which is no problem but a soil stack is in...
  3. P

    soil stack seal repair

    Hi to All, I have a soil stack where the putty or cement has blown off due to the cold weather, My question is what is the best way to reseal it is it best to use putty or cement it? The seal has gone where the toilet waste enters the stack - any help appreciated.
  4. I

    Soil stack ventillation

    Hi everyone. I have a question relating to soil stack ventillation. I am installing 2 new bathrooms near to front of the property, one upstairs and one below it on the ground floor. Next to the upstairs WC i am installing an AAV just next to it, terminating just above the height of the basin...
  5. 1

    Broken soil stack

    Posted: Tue Mar 09, 2010 12:11 pm Post subject: Broken soil stack [/URL] Hello this is my 1st post so please be nice. At the weekend i went to repaint my soil stack outside. All was going ok till i got to the branch part where the pipe from the wc comes out of the house into the branch on...
  6. T

    Air testing soil stack

    Hi all, I'm thinking of renewing the old cast iron soil stack on our house when carrying out renovations in our bathroom (which involves moving the positions of the sanitaryware so it's quite extensive). I read that all new soil stack installations should be air tested using a 'U' gauge in...
  7. C

    Divert soil stack?

    :)Can anyone advise me; I want to move my soil stack from inside to outside. This would mean drilling a 100mm hole through a pier wall 'for waste & vent pipe'. The house is a concrete block 1960's built house with cladding. The pier is 300mm block pier between a window and exterior door, with a...
  8. F

    Making a parallel branch on a soil stack

    Hi all, first post here and need some help! I want to make up a 50mm parallel branch to join 40mm basin and bath wastes to a 100mm soil stack, as if I join them directly it's too close to the toilet connection. Just like it says in the regs. What I would like to know is, does the J-shaped 50mm...
  9. O

    Soil stack and pipe routing advice

    Hi there, I'm new here and I must apologise in advance as I am not a plumber but an individual who's about to embark on having their small bathroom redone and I have a question I was hoping I might be able to get your expertise on. Please see 2 pictures below of my bathroom. The first has the...
  10. H

    Rotate branch on soil stack

    Hi there, I have a pvc soil stack which unfortunately runs inside my house in a cavity wall. Currently the branch for the toilet waste comes out 90 degrees to the wall, under the floorboards and through a hole in the floor for an old style vertical waste toilet. I need to rotate the toilet...
  11. K

    Soil stack connections ?

    Hi Everyone, I am new here, and have joined after coming across the site searching for an answer to my question on google :) Anyway I hope you can help me, I have recently finished an extension on the house, apart from a larger kitchen we now have a utilty / cloakroom next to the main...
  12. M

    Weird soil stack set-up, how to do new connection?

    Hi, I am looking to install a 2nd bathroom upstairs into my new house (new to me, built 1985) so have been examining my current set-up. To me the soil stack seems a little odd and am not sure if i can connect into it safely. I think it may have been set-up like this so that the soil stack...
  13. J

    Soil Stack

    I am re-installing a toilet, basin and shower into a room that used to have just a toilet and sink. This is in a third floor flat in an old Edinburgh tenament. There is a toilet in the room next door and I think they are both on the same line. I am unable to check the situation regarding the...
  14. J

    Internal soil stack

    Hi, looking for a bit of advice my soil stack current runs internaly from ground floor out of a flat roof on the third floor (made of plastic),I want to move this outside. Is there any issues with doing this? Secondly I want to swap my bathroom and kitchen one for the other but my bolier is...
  15. P

    awkward internal soil stack

    Hi, . Im due to commence work on a property installing a WC in a bathroom. Previously this bathroom had a bath and basin but no WC. With a WC exisiting in a second bathroom the other side of the house. This will involve creating a new branch that connects into the internal soil stack in the...
  16. F

    Where should condenser drain on condensing boiler terminate?

    Hi All, We had a new condensing boiler (heating system) fitted in the loft earlier this year. On showing a friend the new installation, he asked why the condenser outlet drain was plumbed into the stack pipe (from the w.c.) that passes through loft space and out above the roof. He seemed to...
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