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分别采用Mohr-Coulomb模型、修正剑桥模型和UH模型预测正常固结土在常规三轴压缩、三轴伸长和平均主应力p减小的压缩工况中典型路径下土的变形特性。Mohr-Coulomb模型为理想弹-塑性模型,屈服之前为弹性变形,屈服之后为变形无限增大的弹-塑性变形。修正剑桥模型能够较好地模拟压缩路径条件下正常固结土的应力-应变关系,但模型较高地估计了伸长路径条件下土的强度。UH模型为适用于正常固结土和超固结土的弹-塑性模型,其建模简单,参数与剑桥模型相同。对于正常固结土,UH模型能够退回到剑桥模型。通过采用基于SMP强度准则的变换应力方法,模型能够合理描述土的三维应力状态的特性。
The Mohr-Coulomb model, the modified Cambridge model and the UH model are respectively used to predict the deformation characteristics of soils under the typical conditions of normal triaxial compression, triaxial elongation and average principal stress p in the compression condition of normal consolidation soil. The Mohr-Coulomb model is an ideal elastic-plastic model, which is elastic deformation before yielding and elastic-plastic deformation with infinite deformation after yielding. The modified Cambridge model can well simulate the stress-strain relationship of normal consolidated soil under compression path, but the model estimates the strength of soil under extended path condition. The UH model is an elastic-plastic model that is suitable for both normal and overconsolidated soils. The model is simple and has the same parameters as the Cambridge model. For normal consolidated soil, the UH model can be returned to the Cambridge model. By using the transformation stress method based on the SMP strength criterion, the model can reasonably describe the characteristics of soil three-dimensional stress state.