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Re: Tank settlement

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One of the things you may recommend is:

Install sand wick drains (vertical) in the soil and fill the tank water in stages. At each stage of loading, wait for the settlement to occur until the rate of settlement has dropped to an "acceptable" limit. This method would accelerate the settlement of the stratum. After completing this procedure connect the piping to the tank. You will have to consult with the geotechnical engineer to determine the size, depth and spacing of the wick drains and, the rate of hydrostatic loading of the tank.

Rajendran


--- On Wed, 9/24/08, Bhavin Shah <bhavin.design(--nospam--at)gmail.com> wrote:
From: Bhavin Shah <bhavin.design(--nospam--at)gmail.com>
Subject: Tank settlement
To: "seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
Date: Wednesday, September 24, 2008, 5:18 PM

This is regarding tank (15.0m diameter & 15.0m height) supported on
ring wall (inside of the ring wall has been filled up with the
compacted sand.) resting on clayey soil.

For design of the foundation total settlement at the tank has been
considered as 150mm (immediate settlement =15mm + consolidation
settlement = 135mm) as per the soil report. However, as informed by
Piping engineer, for pipes (30" dia.)connected to the tank,
permissible differential settlement is only 50mm because of the
congested plant and as per the flexibility analysis.

Kindly advice what measures may be taken so that tank foundation can
be designed for 150mm of the settlement.

Thanks
Bhavin

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