考虑桩机作用的静压桩挤土效应

为更真实有效地认识静压桩挤土效应问题,从压桩的实际过程出发,提出了考虑桩机作用的半无限土体上刚性板作用竖向荷载结合半无限土体中圆孔扩张的简化模型,并在ANSYS软件平台上进行了三维有限元数值模拟.实测和有限元仿真结果表明,目前通用的轴对称简化模型不能准确反映真实情况,需要考虑静压桩机作为荷载和表面约束的作用.静压桩挤土效应实际上是压桩机竖向压土和桩受压沉入土两者综合作用的结果.

Squeezing effects of jacked pile considering static pile press machine's action

A simplified model in which vertical loads acting on the rigid plate on the semi-infinite soil body was combined with expansion of cavity in the semiinfinite soil mass was put forward to study squeezing effects more truly and effectively based on the practical process of static piling,and three-dimensional finite element analysis was carried out on the platform of ANSYS.In-site test and finite element analysis indicated that the simplified axially symmetric model usually used now cannot reflect the fact accurately,and that the action of the static pile press machine as load and surface restriction needs to be considered.Squeezing effects of static piling are integrated results of the vertical pressure on soil by the static piling machine and the pressed pile's driving into soil.