Research on the bearing performance of HSCA high-strength preloaded expansion piles in calcareous sand foundation.

8 : During the process from pouring to consolidation stability of the pile, the expansion stress can be divided into four stages based on the evolution trend of the expansion stress of the pile expansion section over time: Rapid growth stage: During the consolidation process of the pile body, the expansion agent undergoes a hydration reaction to produce expansion stress, which continuously increases with time and reaches a peak stress of about 1600 kPa near 18 h; (ii) Loss Stage: From 18 to 25 h, the expansion stress shows a decreasing trend.

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The side resistance in this section exhibits an increasing trend with the increasing dosage of the expansion agent.

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