UH模型数值计算优化分析  

Optimization analysis for numerical calculation of UH model

作　　者：张奎 姚仰平[1] ZHANG Kui;YAO Yangping(School of Transportation Science and Engineering,Beihang University,Beijing 102206,China)

机构地区：[1]北京航空航天大学交通科学与工程学院,北京102206

出　　处：《北京航空航天大学学报》2025年第2期546-552,共7页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家重点研发计划(2018YFE0207100);国家自然科学基金(52238007,51979001)。

摘　　要：数值计算是进行岩土工程问题分析的重要工具,将统一硬化(UH)模型准确、高效地应用于岩土工程数值计算具有重要价值。基于此,研究分析了UH模型在理论继承性、加卸载判断、等效思想应用等方面的优越性,开发了UH模型图形用户界面(GUI)组件和用户自定义材料(UMAT)子程序,进而将UH模型有效嵌入有限元软件,并通过应用切线刚度矩阵的对称化方法及低压应力变换改进公式改进了数值计算的收敛性。将UH模型应用于地基荷载板试验模拟,发现UH模型计算所得荷载-沉降曲线与试验数据较为接近,体现了UH模型在地基变形计算中的可靠性。研究结果实现了UH模型数值计算功能的有效开发及计算方法的改进优化,对解决复杂岩土工程问题具有重要价值。Numerical calculation is an important tool for analyzing geotechnical engineering problems,and the accurate and efficient application of the unified hardening(UH)model in numerical calculation of geotechnical engineering is of great value.The superiority of the UH model in theoretical inheritance,loading and unloading judgment,and equivalent concept application was studied.The graphical user interface(GUI)components and user material(UMAT)subroutine for the UH model were developed,and the UH model was effectively embedded in the finite element software.The convergence of numerical calculation was improved through the application of the symmetry method of tangent stiffness matrix and the improved formula of low-pressure stress transformation.The UH model was applied to simulate the foundation load plate test,and the calculated load-settlement curve was found to be close to the test data,which demonstrated the reliability of the UH model in foundation deformation calculation.The research results have effectively developed the numerical calculation capabilities of the UH model and improved the optimization of the calculation methods,which holds important value for solving complex geotechnical engineering problems.

关 键 词：数值计算 统一硬化模型 用户自定义材料 收敛性 地基承载力 

分 类 号：TU433[建筑科学—岩土工程]