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砂土地区密集沉桩过程中产生的挤土效应对桩周土有明显的挤密作用,使得桩周土孔隙比降低,抗剪强度增加。但是常规设计通常不予考虑而偏于保守.本文通过基于等体积假设的简化理论分析以及正式施工前试桩的破坏性单桩竖向抗压静载试验,验证了沉桩挤密对桩基承载力的显著影响。考虑沉桩挤密作用的桩基优化设计方案较常规设计方案节约投资约300万元,取得了良好的经济效益,可为同类工程提供有益的参考.
The soil compaction effect produced during intensive pile driving in sandy soil area has a significant compaction effect on the soil around the pile, resulting in a decrease in the void ratio of the soil around the pile and an increase in the shear strength. However, the conventional design is usually not considered and partial conservative.This paper, based on simplified theoretical analysis of the equal volume assumption and the vertical static pressure static load test of the destructive single pile before the formal test, Significant effect of bearing capacity. The pile foundation optimization design considering the effect of pile sinking and squeezing saves about 300 million yuan compared with the conventional design scheme and achieves good economic benefits and can provide useful reference for similar projects.