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基于对空间滑动面本构模型的仔细分析发现,由于该模型假定空间滑动面上的应力比(剪应力与法向应力之比)与应变比(法向应变与剪应变之比)之间为直线关系,因而导致不适应于低应力水平和不能考虑土逐渐趋于破坏的特性。通过假定空间滑动面上的应力比与剪应变之间符合双曲线关系予以修正。与三轴条件下砂土和黏性土的试验结果比较表明,修正后的模型不仅适应于整个应力及应变的可能变化范围、反映土随荷载增加逐渐趋于破坏的特性,而且计算精度在总体上还略高于原模型。修正模型中的参数均可由常规三轴排水试验确定。
Based on careful analysis of the constitutive model of the sliding surface, it is found that since the model assumes that the stress ratio (the ratio of shear stress to normal stress) and the strain ratio (ratio of normal strain to shear strain) on the sliding surface are Linear relationship, resulting in not being able to adapt to low stress levels and can not consider the soil gradually tends to damage the characteristics. The correction is made by assuming hyperbola relations between stress ratio and shear strain on the sliding surface in space. Compared with the test results of sand and clayey soil under triaxial conditions, the modified model not only adapts to the possible variation range of stress and strain, but also reflects the gradual destruction of soil with increasing load, On the slightly higher than the original model. The parameters in the revised model can be determined by the conventional triaxial drainage test.