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利用大型有限元软件ABAQUS所提供的UMAT用户材料子程序接口,针对下负荷面剑桥模型开发了子程序,对超固结土的三轴排水与不排水试验进行了数值模拟,将结果与解析解进行了比较;对同样条件下不同OCR超固结土的三轴排水与不排水试验进行了模拟。结果表明:所开发的子程序具有良好的稳定性和较高的计算精度,能够反映超固结土的应力应变特性(如应变软化),得到比较合理的数值分析结果。
Using the UMAT user material subroutine interface provided by the large finite element software ABAQUS, a subroutine was developed for the lower load surface Cambridge model to simulate the triaxial drainage and undrained test of overconsolidated soil. The results and analytical solution Were compared. The triaxial drainage and undrained test of different OCR overconsolidated soils under the same conditions were simulated. The results show that the developed subroutine has good stability and high precision, which can reflect the stress-strain characteristics (such as strain softening) of overconsolidated soil and obtain more reasonable numerical analysis results.