1. The experiments in the Belfast clay-silt have shown that high-level, one-way, cyclic tension loading can lead to cyclic failure and short term losses in static capacity. 2. Group piles with a typical spacing ratio (s/B≈3) develop cyclic failure at lower loading levels than single piles and experience a significantly greater degree of degradation. 3. The exacerbating group action is believed to be due to the group piles' mutually compounding distributions of static and cyclic vertical shear stresses. 4. High-level two-way loading is likely to lead to more severe effects than one-way cycling.
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