强夯荷载作用下填土地基的动力特征分析

Analysis of Dynamic Characteristics of Backfill Foundation under Dynamic Compaction Load

为了研究强夯作用下填土地基的动力响应特性,采用ABAQUS有限元软件对强夯作用下土体的动应力、位移、振动速度和振动加速度进行模拟分析。结果显示,夯击能沿径向衰减的速率要大于沿深度方向衰减的速度,强夯作用下土体的动应力分布和竖向位移分布呈梨形;土体的振动速度、振动加速度均会随着土体的深度和径向距离的增加而减小,土体的振动特性持续时间要远小于实际工程中的夯击间隔时间,因此不用考虑振动叠加的影响;随着夯击次数的增加,振动速度的峰值先增高,随后会趋于稳定。研究结果对类似工程的设计和施工具有一定的参考作用。

In order to study the dynamic response characteristics of the backfill foundation under dynamic compaction,the finite element software ABAQUS was used to simulate and analyze the dynamic stress,displacement,vibration velocity and vibration acceleration of the soil.The results show that the attenuation rate of the impact energy in the radial direction is greater than that in the depth direction.The dynamic stress distribution and vertical displacement distribution of the soil under the action of dynamic tamping are pear-shaped.The vibration velocity and vibration acceleration of the soil both will decrease with the increase of the depth and radial distance of the soil.The duration of the vibration characteristics of the soil is much shorter than the ramming interval in the actual project,so there is no need to consider the impact of vibration superposition.With the increase of the number of impact,the peak value of the vibration speed will increase first,and then it will stabilize.It has a certain reference effect for the design and construction of similar projects.