The main resistance to sinking a well foundation (caisson) through cohesive soil is:
Choose the correct answer
Dead weight of steining
Skin friction on the outer periphery of the steining in contact with soil, which must be overcome by the dead weight plus any kentledge used
Wave pressure
Wind load
Correct Answer
B. Skin friction on the outer periphery of the steining in contact with soil, which must be overcome by the dead weight plus any kentledge used
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Caisson sinking: weight of well must exceed skin friction + cutting edge resistance. Friction F = K x gamma_soil x z x tan(delta) x perimeter x z (increases with depth). Methods to reduce friction: pneumatic caissons, water jetting, bentonite lubrication, kentledge loading. If friction exceeds weight, tilting may occur.
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