基于ABAQUS的大直径钢管桩高频振动贯入速率有限元分析

为研究大直径钢管桩振动贯入速率,利用ABAQUS有限元软件建立钢管桩振动贯入全过程的有限元模型,对贯入速率、贯入阻力及静载力与动载力比值影响因素进行分析。结果表明:管侧土体剪应力-剪应变滞回曲线为典型的"香蕉"形,每个循环的滞回曲线均由2个剪胀阶段和2个剪缩阶段组成;管端土体轴向应力-剪应变滞回曲线为典型的"镰刀"形,管端土体经历2个显著的压缩阶段和拉伸阶段;管桩高频振动贯入过程可分为缓慢和快速贯入2阶段;采用高频振动锤贯入管桩时,应考虑到静态荷载与动力荷载幅值的耦合关系。

Finite element analysis on penetration speed of large-diameter steel pipe pile installed by high frequency vibratory hammers based on ABAQUS

In order to study the penetration speed of large-diameter steel pipe pile driven by vibratory hammers, finite element model was established by using the commercial code ABAQUS and the penetration speed, penetration resistance and the ratio of static load force to dynamic load force were analyzed. The results indicated that the hysteresis loops of the pipe pile shaft soil are presented as the banana-shaped curve, which shows the soil experiences two phases of dilation and two phases of contraction during each cycle. The hysteresis loops of the pipe pile end soil are presented as the butterfly-shaped curve, which shows the soil experiences compression phase and stretch phase. The process of pipe pile penetrating by high-frequency vibration can be divided into two stages:slow and fast penetration. Consideration should be given to the static load and dynamic load amplitude coupling relationship.