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Pipe Bedding on Very Soft Clay in Coastal Region

Pipe Bedding on Very Soft Clay in Coastal Region

Pipe Bedding on Very Soft Clay in Coastal Region

(OP)
Dear all,

I'd like to design of pipe bedding on very soft clay stratum in coastal region.

There is very soft clay ( c = 0.5 kg/cm2, SPT N=0~2) of 10 m thick depth.

Water depth will be less than 5m.

Any experience like this matter would be helpful to me.

RE: Pipe Bedding on Very Soft Clay in Coastal Region

A cohesion of 0.5 Kg/cm^2 is not so bad, just am wondering if that value could be qu, the unconfined compressive strength. Where qu=2c. Either case, a low blow count, N, is a given in soft to medium soft clays. In such a case, we would place a geofabric first to separate the stone from the clay, increase the bedding thickness to a minimum of 30 cm, and limit the excavated trench width to slightly larger than the pipe diameter.   

A Member of
www.civilvillage.com

RE: Pipe Bedding on Very Soft Clay in Coastal Region

(OP)
Thank you, "fndn".

As you noted, c value in previous post was incorrect.
factually c=0.05 kg/cm2. SPT N-value is 1 to 2 of very soft clay.

If you have any experience, please let me know.

RE: Pipe Bedding on Very Soft Clay in Coastal Region

My experience was in watermain pipe project. We had soft clayey silt, and I asked for a geaofabric and doubled the 6" bedding to 12". That was about 6 yrs ago, and our C value was close to 0.7 Kg/cm^2. Hope this link helsp:

http://www.concrete-pipe.org/designdata.htm

A Member of
www.civilvillage.com

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