![]() ![]() Therefore, it is logical to reinforce underground water retaining structures in the near face and the far face, just in case the loads are reversed.Īnother important aspect in the design of reinforced concrete circular water tanks is ensuring that the section of the tank remains water-tight. However, when the tank is empty, the walls will likely be subjected to earth pressure only. This makes sense because, during the testing or inspection of water tanks for leakage or sometime after the construction, it may be possible that the backfill earth may not be in place or removed. To a large extent, these pressures may neutralise each other due to their reverse directions and relatively close values, but it is often common to ignore earth pressure when assessing water tanks for ‘filled’ service conditions. For instance, when the tank is filled, the walls of the tank will be subjected to hydrostatic pressure from the stored water and lateral earth pressure from the retained earth. The most critical service case should then be used in the structural design. In order to adequately design underground circular water tanks, the effects of actions on the tank should be evaluated when the tank is empty, and when it is filled. ![]() other indeterminate forces and indirect actions.gravity forces from the self-weight of the tank and the cover.lateral earth pressure from the retained earth.gravity vertical load due to the stored water.hydrostatic lateral pressure from the stored water.Circular water tanks that are buried under the ground can be subjected to a variety of forces such as ![]()
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