I’ve conducted a series of oedometer tests using fully saturated undisturbed clay samples (w: 41.46%; LL: 35.1%; PI: 13.3; Gs: 2.672). The cylindrical specimens were 6cm in diameter and 2cm in thickness. Identical specimens were investigated for double drainage and single drainage separately. The samples with double drainage had 25% more instant deformation on average than samples with single drainage. I’d be grateful if anyone help me to explain this phenomenon.
The excess pore water pressure drops to zero immediately after the load is applied at the top and bottom (for doubly drained sample) and at the drainage interface for single drainage. This means that a doubly drained layer will consolidate 4 times as fast and for a 2 cm height sample, the settlement will be quicker even for clay.
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