饱和砂层场地振冲挤密对桩基础性能影响试验研究
Experimental Study on the Impact of Vibroflotation Compaction of Saturated Sand Stratum Sites on the Performance of Pile Foundations
摘要: 本文针对易液化饱和砂土地基，通过现场静载试验研究了振冲挤密工序(先挤密地基再制桩基础与先制桩基础后再挤密)对单桩承载性能的影响。本次试验结果显示：挤密工序先后对单桩水平与竖向承载力影响不大，二者较天然地基均有显著提升，幅度基本一致。水平受荷时，后挤密桩因土–桩契合更好，桩身最大弯矩和挠度更小；竖向受荷时桩基呈摩擦桩特性，挤密后桩侧摩阻力贡献占比约70%以上。研究指出，计算中须考虑扩径段对桩侧面积的影响，并测得天然地基与挤密地基的桩土滑移极限位移分别为0.035 D与0.06 D。
Abstract: Aiming at easily liquefiable saturated sandy soil foundations, this paper investigates the influence of vibroflotation compaction sequences (compacting the foundation before pile construction versus constructing piles before foundation compaction) on the bearing performance of single piles through field static load tests. The test results show that the sequence of compaction procedures has little effect on the horizontal and vertical bearing capacity of single piles; compared with that of natural foundations, the bearing capacity of single piles under both compaction sequences is significantly improved, with the improvement range being basically consistent. When subjected to horizontal loading, the post-compaction piles exhibit smaller maximum bending moment and deflection of the pile shaft due to the better soil-pile interaction. When subjected to vertical loading, the pile foundation presents the characteristics of friction piles, and the contribution of pile side friction resistance accounts for more than 70% after compaction. This study indicates that the influence of the expanded diameter section on the lateral area of the pile must be considered in calculation, and the ultimate slip displacement of pile and soil in natural foundations and compacted foundations are measured as 0.035 D and 0.06 D, respectively.
文章引用：马锡洋, 杨梦雪, 王雪, 吴金悦, 李晓光. 饱和砂层场地振冲挤密对桩基础性能影响试验研究[J]. 地球科学前沿, 2026, 16(7): 1117-1130. https://doi.org/10.12677/ag.2026.167100

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