How is the performance of piled foundations affected in shrinking and swelling clays?
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The performance of piled foundations in shrinking and swelling clays is significantly influenced by various factors. In swelling clays, the shaft capacity of piled foundations can be affected by the level of swell-induced softening, with shaft capacity decreasing in the upper portions due to swell-induced softening but remaining relatively constant at greater depths where swell is restricted . On the other hand, expansive soils can lead to reduced bearing capacity and foundation failures due to crack development triggered by changes in moisture content, with crack initiation and propagation being influenced by environmental conditions . Additionally, the load-carrying capacity of a single pile in expansive soils is found to be greater under no swelling conditions compared to swelling conditions, highlighting the impact of swelling on pile performance .
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| Sand compaction piles significantly reduce swelling and shrinkage potential in expansive clay soil. The piled foundations' performance improves as both swelling and shrinkage decrease after treatment. | |
| The load carrying capacity of a single pile decreases in swelling soils due to the soil's swelling potential, leading to reduced ultimate capacity compared to non-swelling conditions. | |
| In swelling clays, piled foundations experience increased lateral pressure at lower swell magnitudes, enhancing shaft capacity. However, excessive swell-induced softening can reduce shaft capacity at larger magnitudes. | |
| Laboratory modeling shows that crack initiation and propagation in swelling clays due to moisture changes can reduce bearing capacity, impacting the stability of piled foundations. | |
2 Citations | In swelling clays, piled foundation shaft capacity varies with depth due to swell-induced softening, while lateral pressures increase initially and then decrease as softening progresses. |
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