Nonlinear elastic model can stimulate the hardening part before peak value, but the stimulation to softening part is not satisfying.
非线性模型可以模拟峰值前的硬化部分，但不能很好模拟软化段较陡的降落；
One important conclusion is that nonlinear creep theory gives almost the same results as those of linear one, but gives rather different results from those of strain-softening model.
计算表明，非线性理论的结果与线性理论的结果相差不大，而拉应变软化模型的结果与前两者有较大差异。
Suggest the nonlinear elastic Constilutive model taking into the account of strain-softening, shear dilatancy(shrinkage)properties and stress path.
提出考虑土的应变软化、剪胀（剪缩）性和应力路径影响的非线性弹性模型。
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