摘要
剪胀性是砂土最重要的特性之一,其变形主要取决砂土的当前状态,而基于状态相关砂土本构模型能较好反映砂土剪胀性。ABAQUS作为有限元计算平台,具有强大的非线性计算和前后处理功能,标准ABAQUS程序仅包含一些通用土体本构模型,缺少状态相关砂土本构模型,因而有必要针对土木工程具体问题进行二次开发。利用二次开发工具和UMAT数据接口程序,采用隐式积分算法将基于状态相关砂土本构模型嵌入到标准ABAQUS程序中,并将有限元数值计算结果与实验数据及理论计算值比较,进行单元敏感性分析。计算结果表明子程序运行稳定可靠,不仅充分利用ABAQUS方便、快捷的前后处理和强大的非线性求解平台,还可以完成更复杂,且切合实际土体应力应变关系的有限元数值计算,拓展ABAQUS在土木工程领域应用能力。
Dilatancy of sand is one of the most important features, but depends on the current state of deformation. state-dependent constitutive based model can reflect the dilatancy of sand. ABAQUS is a t＇mite element computing platform, with strong non-linear calculation and post-processing functions. The standard ABAQUS program contains general soil constitutive model, but lack of relevance. So it is necessary for the civil engineering to carry out the secondary development according to specific issues. With UMAT and the use of secondary data interface development tools, by means of implicit stress integration algorithm, the state-dependent constitutive model of sand embedded in the standard procedure in ABAQUS, and ABAQUS expanded computing power in the civil engineering field. Compared f＇mite element numerical results with experimental data and theoretical values, the unit sensitivity analysis is implemented, and the results showed that the subroutine run stable and reliable, not only take full advantage of ABAQUS convenient, fast and powerful before and after the processing platform for solving non-linear, but also perform more complex, more realistic soil stress-strain relationship of FEM.
出处
《安徽工业大学学报（自然科学版）》
CAS
2013年第3期301-307,共7页
Journal of Anhui University of Technology（Natural Science）
基金
国土资源大调查计划项目(1212011120072)
港口航道重点实验室开放基金资助
关键词
状态相关砂土模型
ABAQUS
隐式积分算法
二次开发
state-dependent sand constitutive model
ABAQUS
implicit stress integration algorithm
secondary development
