考虑洛德角影响的边界面模型在ABAQUS中的数值研究

摘要

Based on the finite element software ABAQUS user material subroutine UMAT, consider the boundary model for influence of Lode angle of secondary development. The key techniques and implementation steps of the numerical implementation are given. Using the subroutine of normally consolidated and over consolidated kaolin were consolidated undrained triaxial test and numerical simulation. The results show that considering the Lode an-gle influence the boundary surface model can better simulate the soil stress strain characteristics, the calculation result is more close to the measured data to verify the subroutine considering Lode angle correctness, reliability and superiority. The result of the calculation is reasonable and reliable, which indicates that it can be applied to the analysis of three axis consolidation and non drainage experiment of soil ingeotechnical engineering, expand the application range of the ABAQUS.%基于有限元软件ABAQUS提供的UMAT用户材料子程序接口，实现考虑洛德角影响的边界面模型的二次开发。给出其数值实现过程的关键技术和实施步骤。运用该子程序对正常固结和超固结高岭土进行固结不排水三轴试验数值模拟，研究结果表明：考虑洛德角影响的边界面模型能较好的模拟土的应力应变特性，其计算结果更接近于实测数据，验证了考虑洛德角影响的边界面模型子程序的正确性、可靠性和优越性。算例的计算结果合理可靠，表明经二次开发后ABAQUS可用于岩土工程土体三轴固结不排水试验方面的分析，从而可扩展ABAQUS软件的应用范围。