流固耦合饱和两相介质动力模型在ABAQUS中的实现

Fluid-solid coupling dynamic model for fluid-saturated porous media in ABAQUS

摘要: 摘要：采用以固相位移和孔压为基本未知量的-形式的方程组对于研究饱和土体的地震动力响应问题相对简单。利用通用有限元软件ABAQUS所提供的用户自定义单元（UEL）接口,编制相应的接口程序,开发了基于流固耦合两相介质动力模型的孔压单元。通过算例对所开发单元的正确性进行了验证,结果表明,所开发的孔压单元能够对饱和土体的动力响应进行较为准确的计算,而ABAQUS中提供的CEP4P孔压单元动力反应计算结果与实际情况有较为明显的差异。

Abstract: Abstract: It is relatively simple for the calculation to the dynamic response of saturated soils to adopt - equations which regard solid-phase displacement and pore pressure as basic unknowns. The pore pressure element based on the fluid-solid coupling dynamic model is developed using ABAQUS which provides users a interface to define a new element (UEL). The results of a numerical example show that the dynamic response can be calculated accurately using the developed pore pressure element. The calculated results obtained with the CEP4P element provided by ABAQUS are obviously different from the real ones.