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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. S

    There are drips down through my house along the soil stack

    Hi, I live in a house that is 20yr old. There is a single soil stack running from the top floor (of three) through the first floor bathroom and then through the kitchen to the drains. A while back I started to hear a drip hitting the kitchen ceiling (now with some ceiling evidence too) from...
  2. I

    soil stack adaptor query

    Hi Oracles of all things plumbing, I have to replace a cast iron soil stack which is simple enough, done a few up here in Scotland, however, client wants to retain the 3" toilet waste as he does not want an enlarged hole making in a newly rendered wall, which 110 to 75mm fitting is best? trying...
  3. T

    Job in Leyton E10 - Cast Soil Stack Replacement

    I need a quote to replace a soil stack ( cast ) in Leyton e10. The stack is already in plastic at the bottom. There also needs to be amendment to branch to accomodate a change of position of the bathroom in the upstairs flat. BTW - this is one up/ one down flat arrangment. There is access to...
  4. jklondon

    Noisy Soil Stack - Any suggestions please

    We have a bathroom where drainage runs across the house to soil stack. After shower especially in night when there is high temperature difference between inside and out there is clicking noises that impacts our bedroom (1) and more annoyingly our 3rd olds room (2)! I am wondering what could be...
  5. G

    Strap boss leak between strap and pipe

    Hey all, I’ve got a new section of stack fitted but when I fitted the strap boss I was too keen to test it and it now slightly leaks where it meets the stack. I was wondering whether it’s worth trying to get it off and have another go or just replace the full piece (about 2 metres ) If I did...
  6. H

    Plumbing & Drains For New Extension - Advice Needed Please

    Hi All, I'm due to start building a new side extension on a 3 bed semi, it's across the driveway up to the boundary. We're adding a downstairs toilet and utility room. The existing soil stack will be retained and boxed in with added rodding eye as it's well positioned for the existing 1st...
  7. J

    Soil stack reduction

    Can I go from a four inch drain pipe then reduce the soil stack to 3 inches(just under the subfloor below the bathroom floor) then go back to four inch in the attic - above the bathroom? I need 1 inch of room for a 30 by 60 tub - the soil stack is pvc and I need to reduce it to 3 inches in the...
  8. A

    50mm waste run to soil stack

    Hi, When running 50mm waste to the stack, how do I get it so the 50mm does not have to be so far from the wall? As the offset at the stack dictated by the boss on the soil pipe. Hopefully this makes sense! Please see my picture which hopefully helps. I bought a 135 deg bend thinking I could...
  9. G

    Boss strap failure….

    Morning everyone. Got an issue with an internal soil stack boss strap failure. The boss strap had been sealed originally with silicon which has failed and caused a leak. The soil stack is accessible but it’s tight working area. Do I seal the boss strap with OB1, cross my fingers and hope it...
  10. A

    Connecting a new toilet into an existing soil stack

    Hi. I want to connect a new toilet waste into an existing 110mm soil pipe. The soil pipe runs from the second floor bathroom, down through the room where I need a new toilet and then down through the ground floor where there is another toilet attached. The soil pipe will not move up or down so...
  11. A

    Poor fall on soil pipe and toilet blocking. Advice for fixes please?

    Hi all, looking for some soil pipe/stack help please. I bought my first house end December and unfortunately had a toilet pipe blockage within a month. Place is old but was renovated in 2014 so thought it would be in decent nick! Plumber came out to rod it end January from the access hatch...
  12. A

    USA Is it legal for neighbour to add 5 extra WC s

    HMO house wanting 5 extra WC s all to come across my property is this legal for them to do also 5 ensuites
  13. A

    New soil stack to toilet connection

    Hi. I'm installing a new soil stack for a new upstairs bathroom. For the toilet, where the 110mm pipe comes through the wall to outside, which pipe fitting do I use? It has to come out and then across to the soil stack, but all the branches and bends are 92.5 or 87.5 degrees but surely it needs...
  14. M

    long steep complex internal waste layout

    5th floor flats washing machine waste runs internally down to our 3rd floor flats bath waste then further down through to the other side of the house to enter the soil stack on the first floor flat The sink in our bathroom falls internally to the stack at the first floor flat. Also if the...
  15. 0

    Smell from stack pipe in flat

    Hi, I live on the first floor of a 6 storey block of flats. For months now, there has been a bad smell coming from the stack pipe - the smell fills the whole flat, but it does appear to be coming from the stack pipe as the smell seems stronger around there and seems (we think) to get stronger...
  16. R

    Internal Soil Stack Connector

    Attached photo shows a bath waste to internal soil stack that's probably been leaking since the house was built. Problem I have is that the connection is not easily accessed. Can anyone please advise if the bath waste pipe connector is push fit? Anyone have any good ideas to fix the problem...
  17. gerry2190

    URGENT Rats chewing rubber seal entering soil stack and then rest of the pipe

    Hi everyone, thank you for time reading this, I own a ground floor flat in a block in Bedford, the issue is that rats from the sewers chew the rubber seal entering the vertical block soil stack and then they keep on chewing the rest of the flexi pipe. Would you know how to stop this? Is there...
  18. B

    who would be able to put back the cowl on top of a soil stack please

    Who do I contact to replace the protector on the top of a soil stack - it blew off in the last winds
  19. J

    internal soil stack spain

    any advice needed pls, putting new bathroom upstairs in spanish house, no soil stack outside ,believe it to be directly under downstairs toilet, if i put new soil pipe in, do i have to locate it ,to fit under downstairs toilet, ime guessing to cut hole into the hole beneath.
  20. Z

    Combined rainwater and soil stack?

    Hi, we have moved our upstairs bathroom so need to put a new soil stack on the outside wall. In the place where we want to put it is a rainwater pipe with a "bucket style" opening at the top, (sorry I don't know the correct term), because it is a flat-roof property so it catches the water from...
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