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Foundation design above River sand....

 
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amit_sharma
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Joined: 25 Nov 2010
Posts: 47

PostPosted: Wed Dec 11, 2013 7:19 am    Post subject: Foundation design above River sand.... Reply with quote

Dear All Sefians,
i am designing a hospital buiding located at Rajasthan. The building is G+4 storey.
The problem is this that according to SBC report, the SBC below 1 mtr from NGL 1.5 t/sq-mtr, below 2 mtr from NGL is 2.5 t/sq-mtr, below 4 mtr from NGL is 10 t/sq-mtr and below 5 mtr  is 12 t/sq-mtr.
The problem is this that at a distance of 125 ft from this building, River is present and the soil below building upto 3 mtrs is "River Sand".
What should i do for foundation design of this kind of building (we want to avoid pile foundation due to some financial reasons) ? And we also want to avoid the excavation till 4 mtr bcoz chances of water pores may appear from ground.
Kindly help me for above matter with your great experiences as soon as poosible.

Waiting for you all responses.
Amit Sharma
Jaipur.
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sknsrinivasan
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Joined: 15 Apr 2013
Posts: 281

PostPosted: Wed Dec 11, 2013 8:26 am    Post subject: Reply with quote

Dear amit sharma
you can't provide isolated footing here because the SBC of soli is not good. The building is G+4 storey Calculate maximum axial load on the column and find out the size of footing if the design satisfy all requirements you can provide Isolated footing, Generaly the bottom of footing must be rested on atleast TypeII (stiff soil) the N value should be 10 to 30 why I am telling this since you are avoiding pile foundation
  But My opinion is better to provide pile foundation in this type of soil,  Different type of piles are there
    a) concrete pile
    b) steel pile
    C) Timber pile, in these 3 piles which one is very economical one you select that one

Thanks
N.Srinivasan
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amit_sharma
Progressive Member
Progressive Member


Joined: 25 Nov 2010
Posts: 47

PostPosted: Wed Dec 11, 2013 5:05 pm    Post subject: Reply with quote

Thank You so much Sir...

sknsrinivasan wrote:
Dear amit sharma
you can't provide isolated footing here because the SBC of soli is not good. The building is G+4 storey Calculate maximum axial load on the column and find out the size of footing if the design satisfy all requirements you can provide Isolated footing, Generaly the bottom of footing must be rested on atleast TypeII (stiff soil) the N value should be 10 to 30 why I am telling this since you are avoiding pile foundation
  But My opinion is better to provide pile foundation in this type of soil,  Different type of piles are there
    a) concrete pile
    b) steel pile
    C) Timber pile, in these 3 piles which one is very economical one you select that one

Thanks
N.Srinivasan
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