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为了研究原始应力对原状土强度和变形的影响,以及处于正常工作状态时土的非极限状态特征和表示方法,基于重塑土和原状土三轴实验过程中的应力状态演变和应力路径特点,采用理论推导的方法研究了重塑土和原状土的屈服特点和非极限状态的应力路径。结果表明,前期应力状态对后续加载过程中土的强度特点具有显著影响,并可以表示为实质应力的函数和某个非极限状态。因此,在研究土的各种力学性质和建立模型时,合理的思路是充分考虑其前期应力状态并将这一状态植入本构模型之中。
In order to study the influence of original stress on the strength and deformation of undisturbed soil and the characteristics and representation of the non-limit state of soil under normal working conditions, based on the evolution of stress state and the characteristics of stress path in triaxial experiment of remolded soil and undisturbed soil, The yield characteristics of the remolded soil and the undisturbed soil and the stress path of the non-limit state are studied using the theoretical derivation method. The results show that the previous state of stress has a significant effect on the soil strength characteristics during subsequent loading and can be expressed as a function of the real stress and a non-limit state. Therefore, in studying various mechanical properties of soil and establishing models, a reasonable idea is to fully consider its pre-stress state and implant this state into the constitutive model.