what is the precautions in analysis and design buried underground water tanks which will prevent uplift under seismic load ? with the effect of soil structure interaction ?
A large block of concrete on the base to stop uplift if empty - very very very expensive to fix afterwards.
Uplift springs can be used for this purpose, more details attached.
If empty, the buried underground water tanks can experiment buoyancy only if tank is empty and there is water table or if liquefaction is produced. In the second case the situation is even more complicated because the buoyancy force is considering the density of liquefacted soil. So, even with water could occur. From my point of view, some anchors will be less expensive than a big concrete block. Of course, not in soil sensitive to liquefaction
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