ABAQUS软件中部分土模型简介及其工程应用

介绍了ABAQUS软件中部分土本构模型,包括扩展Drucker-Prager模型和Mohr-Coulomb模型,探讨了二者的关系及扩展Drucker-Prager模型的适用性.通过分析得出了当内摩擦角>22°时,不能采用Drucker-Prager 模型逼近Mohr-Coulomb模型,当内摩擦角≤22°时则可以代替.并介绍了服从弹性库仑摩擦本构模型的三结点接触单元.以筒桩工程实例为算例,分析了筒桩内外侧摩阻力发挥性状,给出了荷载沉降计算曲线,并与实测曲线进行了对比,二者吻合较好,说明了有限单元法的有效性.

Introduction to partly soil models in ABAQUS Software and their application to the geotechnical engineering

Firstly, partly soil constitutive models are introduced including the extended Drucker-Prager model and Mohr-Coulomb model. The relationships between Mohr-Coulomb and Drucker-Prager model, the applicability of the extended Drucker-Prager model are discussed. Through discussions the Drucker-Prager model can be fit to Mohr-Coulomb model when the inner friction angle is large than 22 degree, it can be fit to Mohr-Coulomb model when the inner friction angle is less and equal 22 degree. Secondly, the three nodes contact element obeying the elastic Coulomb friction constitutive model is presented. At last, The law of the inner and outer friction force in the tubular pile is analyzed. The calculated and the measured curves of the load-displacement are put forward based on the tabular piles engineering. The results are satisfied. At the same time it shows than the FEM is valid to analyze the characters of tubular pile capacity.