Shallow Foundation & Underground Water Table???
Shallow Foundation & Underground Water Table???
(OP)
I am designing a shallow foundation for a G+3 hospital structures, according to soil investigation report the bearing capacity of soil at depth of 1m is 0.75 kg/cm2 (medium stiff clay type) and at depth of 2m the bearing capacity is 1.55 kg/cm2 (medium dense soil)but the problem is that the ground water table is encountered at 1m depth (due to the sea site), so therefore i have some following doubts in my mind any one can help and give some suggestions in this regards?
Does the shallow foundation is suitable for this type of ground situation loads are not very high because of light gauge steel structure????
My foundation should start from 1m or 2m??? If I start from 1m the bearing capacity is very less and if I start from 2m then water table will be above foundation???
Any suggestion for special site treatment to prevent my foundation from underground water table , increase in bearing capacity and future settlement??
Regard's
Does the shallow foundation is suitable for this type of ground situation loads are not very high because of light gauge steel structure????
My foundation should start from 1m or 2m??? If I start from 1m the bearing capacity is very less and if I start from 2m then water table will be above foundation???
Any suggestion for special site treatment to prevent my foundation from underground water table , increase in bearing capacity and future settlement??
Regard's






RE: Shallow Foundation & Underground Water Table???
RE: Shallow Foundation & Underground Water Table???
Before this hospital project porposal was in RCC structure and foundaion was piling which was expensive option. That is why we change RCC structure to light gauge steel structurr to reduce self weight and economize the foundation.
Do we have other option instead of piling, some thing like ground tratment, jet grouting etc??
RE: Shallow Foundation & Underground Water Table???
Ask the geotechnical engineer if the ground water elevation is affected by any tidal action in the sea. If the project site is very close to the sea, that could be the case.
The design issue to avoid is having the bottom of the foundation located at or near the ground water elevation. Either the footing should bear on soil above the water table or below the water table, not on soil that is sometimes "wet" and sometimes "dry". If groundwater elevation is more or less constant at 1 meter depth, foundations bearing on soil at 2 meters depth should work well.
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RE: Shallow Foundation & Underground Water Table???
RE: Shallow Foundation & Underground Water Table???
RE: Shallow Foundation & Underground Water Table???
RE: Shallow Foundation & Underground Water Table???
If the foundation is a built below the water table (say, at 2 meters), then the water table gets higher in the future, this should not be a problem. The soil the foundation is bearing on remains fully submerged and unchanged.
A problem would occur if the foundation was built above the water table. In the future the water table gets higher, submerging the bearing soil.
Building near the sea has many risks - high winds, with or without flooding, tsunami, salt air corrosion of steel (per hokie66's comment), etc.
IMHO, settlement due to earthquake is far down the list of concerns (Would an earthquake that powerful cause a tsunami that would wash away the hospital?). To address all these hazards will cost a lot.
You asked about ground treatment, jet grouting, etc.... Hokie66's suggestion to drive piling is expensive... but it is probably the best and most cost effective way build near the sea.
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RE: Shallow Foundation & Underground Water Table???
so finally i decided to go with mat foundation.
thanks you all for your valuable suggestions.