'Preloading (surcharge fill)' as a ground improvement technique is used for:
Choose the correct answer
Strengthening of rock foundations
Pre-consolidating soft clay by surcharge fill (with or without PVDs) to reduce post-construction settlement
Filling loose sand under vibration
Freezing soft ground
Correct Answer
B. Pre-consolidating soft clay by surcharge fill (with or without PVDs) to reduce post-construction settlement
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Preloading: temporary surcharge fill applied to soft compressible clay to consolidate it before construction. Accelerated by vertical drains (PVDs). Excess pore pressure generated and then dissipates → primary consolidation → settlement occurs before construction → post-construction settlement reduced. Settlement monitoring by settlement plates and piezometers.
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