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对饱和重塑黄土进行了各向等压及等P应力路径试验,分析可知应力应变关系具有非线性,且不符合双曲线型。分别确定了成都科大修正K-G模型及考虑剪胀和应变软化的K-G模型的模量参数并进行了预测值与实测值的比较,结果显示,成都科大修正K-G模型能较好的预测等压固结试验的体积改变量,但不能完全反映软化和应力路径的影响,其仅在低应力比时是适用的;考虑应变软化的K-G模型能很好的反映饱和重塑黄土软化的特性。在预测体应变与剪应变时,在低应力水平时吻合度较高,在高应力水平时不能准确的反映剪胀的影响,更完善的K-G模型修正方法有待提出。
The isostatic equalization and equal P stress path tests on saturated remolded loess show that the stress-strain relationship is non-linear and does not conform to the hyperbolic model. The moduli parameters of the modified KG model and the KG model considering the dilatancy and strain softening were respectively determined and compared with the predicted and measured values. The results show that the modified KG model of Chengdu KeDa predicts the equivalent pressure consolidation However, it can not completely reflect the influence of softening and stress paths. It is only suitable for low stress ratio. The KG model considering strain softening can well reflect the softening behavior of saturated remolded loess. In the prediction of body strain and shear strain, the coincidence degree is high at low stress level and can not accurately reflect the dilatancy effect at high stress level. A more complete K-G model correction method needs to be proposed.