基于Plaxis 3D空间的钢圆筒围护结构稳定性控制

钢圆筒围护结构为桥墩施工创造干施工环境,是施工期重要的临时辅助结构。基于有限元软件Plaxis 3D建立空间有限元模型模拟钢圆筒围护结构的施工过程,采用线弹性模型模拟大圆筒结构,采用Hardening soil model定义土体的本构关系,并在圆筒与筒内土、筒外土之间均加入界面单元模拟接触的实际性质。通过计算不同工况下钢圆筒本身的变位和土体产生的位移,探讨减小圆筒变位、增加结构稳定性的措施。

Stability control of steel cylinder retaining structure based on Plaxis 3D program

As important temporary structures during construction period,steel cylinder retaining structures offer dry environments for the pier construction.A 3D finite element model is built to simulate the constructing process of steel cylinder retaining structure by applying Plaxis 3D finite element software.The elastic model is used to simulate the cylinder,the hardening soil model is adopted as the soil constitutive model,and the interface element is set to simulate the contact between the cylinder and soil body.By calculating the displacement of the soil body and steel cylinder under different conditions,we propose several measures to reduce the displacement and enhance the structural stability.