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基于拉格朗日有限差分方法,建立了以强度参数c和φ表示的关于应变硬化模型的统一弹塑性有限差分格式;在VC++中编写动态链接库文件,将有限差分格式表示的统一弹塑性模型导入FLAC3D中进行计算分析。主要内容为运用统一弹塑性有限差分方法,对软土的真三轴试验进行了模拟分析。在FLAC3D中使用统一弹塑性模型针对上海软土的真三轴试验进行了不同围压和不同中间主应力比条件下的应力应变关系的数值模拟,并与实测数据进行了比较分析。通过分析可知,统一强度理论的中间主应力影响系数B为0.5时能够反映真三轴试验的软土强度特性。
Based on the Lagrange finite difference method, a unified elasto-plastic finite difference scheme for strain hardening model is established based on the strength parameters c and φ. The dynamic link library file is prepared in VC ++ and the unified elastoplastic model represented by finite difference scheme Import FLAC3D for calculation and analysis. The main content of this paper is to simulate and analyze the true triaxial test of soft soil by using the unified elasto-plastic finite difference method. In the FLAC3D, a unified elastic-plastic model was used to simulate the stress-strain relationship under different confining pressure and different middle principal stress ratio for the true triaxial test of Shanghai soft soil. The numerical simulation was compared with the measured data. It can be seen from the analysis that the influence coefficient of the middle principal stress of the unified strength theory is 0.5, which can reflect the soft soil strength characteristics of the true triaxial test.