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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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Recent contents Top users
  1. SimonG

    Whats The Minimum Vent Off A Soil Stack?

    Looked a job today, possibly looking at reducing vent size as it's a difficult run. 75mm sticks in my head for some reason. Cheers.
  2. R

    Soil stack termination inside bathroom floor

    Hi guys, I'm currently getting a new bathroom fitted in a property I just moved into. The house has a side extension, but the waste pipe had not been moved hence it's coming out the floor inside the side extension area of the property. The builder has extended this up straight into the...
  3. J

    Soil stack and waste

    Check out this lovely work!! Waste from basin into guttering which runs into the ground.... Just have a look at the pics. Is it acceptable to run waste into? guttering Would you work with what there is to some degree making some(a lot)alterations or strip it back and start again?
  4. C

    Upstairs Toilet Draining into ground floor soil stack.

    I'm looking to connect an upstairs toilet into an existing ground floor soil stack. Is the solution I've drawn out possible or does the soil stack vent need to be above the connecting appliance still? Red is the proposed new pipework and brown the existing. Let me know any questions.
  5. M

    Part replace soil stack

    How much work is it to part replace cast iron soil stack. I need to add existing toilet upstairs so need to add a branch in to external stack which is cast iron. As far as I am aware I need to use two adapters top and bottom to convert from cast to plastic pipe. Then an adaptor for connection...
  6. A

    Soil stack and sanitary air testing issue

    Hi guys, Currently trying to test sanitary wear on a big site and obviously getting problems everywhere. Recently left for a week and came back and was given different testing gear. All of a sudden when I'm testing I'm getting the reading on the gauge going up!? I've checked all the valves on...
  7. N

    Problem with soil stack

    So I’ve got a new house and the previous owner had left the soil stack in a state, apparently there was a plant growing inside so this was his fix. 89605946-42-FB-42-C6-9-D12-63-D7164499-BF What should I do? I’d rather DIY
  8. J

    Cast iron soil stack

    The waste pipe that's been concreted into the building wall, and runs out into a cast iron soil stack has a crack in it. It is a part of the soil stack and will have to be cut out/or smashed out. If I was to cut the cast iron below this point, put a pvc branch in with a pvc to cast iron soil...
  9. M

    Soil stack query?? Help

    Hi people. Im really struggling for ideas on a soil run and whether using a durgo is sufficient. Basically the soil pipe comes up from groundfloor wc into the bathroom. It used to continue up into the loft and out the roof, teeing off in the bathroom to pick up appliances. The room is tiny...
  10. E

    Removing copper soil stack

    hi. I have a copper soil stack (def copper) that I am hoping to take out, runs through the house, pops out the roof, which is leaking anyway! What’s the best way to connect? I plan on cutting a couple inches before the pipe goes underground, can I stick a connector in, assuming it fits like...
  11. D

    Smell from Kitchen Soil Stack!

    Hi, Looking for some advice, I am getting a drain/sewage smell coming from my kitchen soil stack. It’s always been there since I moved in only a few months ago, I had a new kitchen put in and one thing I remember is the drain pipe got bashed about a bit when the kitchen was getting done. The...
  12. M

    Soil stack vents!!!!!!!!!

    Ive got a big project on the go of a office conversion to flats and at the moment, due to the terrible lay out we have 11 soil stacks in the loft all over the place. The architect wants all the vents to exit in a nice line at the rear of the property which is going to mean massive runs of 110...
  13. M

    Soil stack question for new bathroom

    I'm moving my bathroom from downstairs to upstairs. The current w.c waste goes straight into the ground. I'm on a shared drainage system with no man hole on my property and I also have a nightmare neighbour who has made it problematic in the past when I have had to rod our drains. I have an...
  14. hammers4spanner

    Cast iron soil stack

    Doing a bathroom refurb and we have unearthed a cast stack going straight up through bathroom and venting out through the roof. Basically needs to be removed from the bathroom area . However I don' wish to disturb anything going through the roof. Would you guys just cut the section out if its...
  15. C

    Horizontal soil stack correct fittings

    hi, I'm putting a new toilet in my extension and there is roughly a 4m horizontal run from the new toilet location where it then drops vertically down to the under croncrete soil pipe. The issue is that I've currently got two 92.5 branch fittings connecting this horizontal run to the vertical...
  16. D

    Air vent into soil stack?

    Hi I've got a 100mm in-line fan to extract air from the bathroom and was hoping to use what I see as a shortcut for the outlet. There is a soil stack in the same loft space the I thought maybe I could branch into. That would save me drilling through walls OR using a vent cowl & insulated...
  17. B

    Problem with bad smell, possibly from soil stack?

    Hi all. My apologies for a newbie/DIY-style question, possibly in the wrong forum. I live in a property with a ground-floor bedroom beneath the bathroom. In the corner of the room, there is a sink inside a cupboard and, as far as I can tell, the soil stack is boxed-in and passes through this...
  18. K

    I'm not old enough to know about this bath waste branch.

    There I am getting my bathroom replaced, when I find out just why my old bath was set so high off the floor. The branch to the soil stack stands about a foot off the ground. It has the feel of lead, but on scratching with a key it has the hardness of iron. The house was built in the 60s, if...
  19. S

    Soil Stack Vent Pipe Problem

    Hi. I wonder if anyone could shed any light on this. We have a first floor bathroom. Everytime we drain the bath, the bathroom sink (which is about 4 feet from the bath) gurgles and quite often, the bathroom fills up with the smell of sewer gases. The bath, sink and toilet are draining fine...
  20. G

    External soil stack below window

    Today I have had my internal soil stack removed and a new one fitted externally. The soil pipe ends below my bathroom window with what i think is a durco valve fitted. Several people have stated this does not meet building regs 2 questions 1) Is it within regulations to terminate the pipe...
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