中文摘要：

针对静压桩挤土效应对刚性桩复合地基承载性状的影响问题,采用有限元法进行分析研究。分别建立了静压挤土桩复合地基和非挤土桩复合地基的数值计算模型,基于圆孔扩张理论对静压挤土桩复合地基的变形性状进行数值模拟。结果表明,挤土效应在桩土界面处产生的侧向压力使静压桩的极限侧摩阻力增大,桩侧阻力优先发挥,端阻力发挥相对滞后。静压桩复合地基桩土应力比随着荷载的增大逐渐增加,挤土效应使桩间土强度有所提高,对复合地基承载力的贡献更易发挥。静压桩复合地基的基础沉降变形相对较小。

英文摘要：

In order to study the soil compacting effect on the bearing behavior of rigid pile composite foundation, FEM models of two kinds of composite foundations which are composed of jacked piles and non-displacement piles are established respectively. By using cave theory, the bearing behavior of the jacked pile composite foundation is investigated, and compared with it of non-displacement pile composite foundation. The results show that the ultimate side friction of jacked pile increases with the increasing of the normal stress at the pile soil interface due to the soil compacting effect, and the pile tip resistance lags behind the side friction to contribute to the bearing capacity of the jacked pile. Further, the stress ratio of pile and soil of jacked pile composite foundation increases with the increasing of the load, and the strength of soil between piles somewhat increases due to the soil compacting effect. The p-s curve of jacked pile composite foundation has a steep drop type with a small settlement.