基于岩体应变非线性软化本构模型，考虑中间主应力的影响，对等压荷载作用下的衬砌压力隧洞进行弹塑性分析。
According to the strain nonlinear softening constitutive model of practical rock, pressure tunnel with liner under the uniform pressure is analyzed.
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。
Suggest the nonlinear elastic Constilutive model taking into the account of strain-softening, shear dilatancy(shrinkage)properties and stress path.
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。
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.
饱和黄土的应力-应变曲线具有明显的非线性特性，且饱和原状黄土多为软化型，饱和重塑黄土多为稳定型和硬化型；
Saturated loess stress-strain curve has obvious nonlinear features, and more saturated as the softening of loess, loess saturated remodeling mostly stable and hardening;
饱和黄土的应力-应变曲线具有明显的非线性特性，且饱和原状黄土多为软化型，饱和重塑黄土多为稳定型和硬化型；
Saturated loess stress-strain curve has obvious nonlinear features, and more saturated as the softening of loess, loess saturated remodeling mostly stable and hardening;
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