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Design of Slab on Grade for Connex structure above it.
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vikram.jeet
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PostPosted: Tue Sep 13, 2022 3:38 pm    Post subject: Re: Design of Slab on Grade for Connex structure above it. Reply with quote

spsvasan wrote:



Please check whether subsoil is swelling shrinking soil. It can move the building up and down. Even if the structure is not affected, the service connections, especially sanitary lines, can give some problem

S.P.Srinivasan




Yes , it very sane viewpoint from Er SPS.

Black cotton / expansive soils  need to be replaced by good earth /  sand fill preferably  in entire area , which may be costly .   Separation from exp soil  can be achieved  by creating  a Sand separation layer on  sides and bottom of foundations . Reference can be made to NBC where protection of grade beams from exp soils is shown.
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vikram.jeet
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PostPosted: Wed Sep 14, 2022 3:28 am    Post subject: Reply with quote

Expansive soils  :

Service lines are affected due to such soils . Here also it is better to  use more flexible pipes like HDPE for sewerage and storm water lines. Trenches in which these pipes are laid need to be backfilled with sand/ sand+good earth fill.
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karansohal875
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PostPosted: Fri Sep 16, 2022 3:29 am    Post subject: Reply with quote

Thanks Vikram.jeet and Spsvasan sir for your knowledgeable feedback. I am working on it and will discuss any further queries.
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