The minimum thickness of steining (well wall) for a well foundation is governed by:
Choose the correct answer
Depth of well below scour level only
Structural requirements (hoop stress during sinking and service loads) and the need to provide adequate self-weight for sinking through soil
Number of compartments
River width
Correct Answer
B. Structural requirements (hoop stress during sinking and service loads) and the need to provide adequate self-weight for sinking through soil
Why is this the answer?
Well foundation steining thickness: minimum t = KD (D = external diameter, K = 0.08 for stone, 0.05 for RCC). Must be checked for: (1) bending during sinking (steining acts as a cylinder shell under lateral soil/water pressure); (2) hoop tension; (3) dead weight needed to sink without kentledge. IS 3955 gives design guidelines.
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