基于应力空间变换的修正剑桥模型改进

从岩土类材料极限应力状态线所致的各向异性出发，提出了应力空间变换的思想。以修正剑桥模型屈服面的中心为映射中心，给出了重塑土的应力空间变换、应力增量变换的公式, 并考虑了应力洛德角的影响。在变换应力空间中对修正剑桥模型进行了重新表述与改进，给出了基于应力空间变换的改进模型的具体应力应变计算式。通过4种应力路径的基于应力空间变换的改进模型与修正剑桥模型预测结果的对比，揭示了改进后模型的优越性：可以较好的反映各向异性的影响；可以很好地反映三轴伸长等应力路径的应力应变特性；可以反映 等路径所致的软化现象。

Improvement of modified Cam-Clay model based on transformation of stress space

Based on the anisotropy induced by the critical stress line, the idea of transformation of stress space is presented. With reconstituted soils taken as an example, the formulas of transformation of stress space and stress increment are provided, and the influence of stress Lode’s angle is considered also. The modified Cam-Clay model is expressed again and improved in the transformed stress space; the stress-stain formulas of the improved model are presented also. Through the comparison of the computed results of four kinds of stress path by the improved model and the modified Cam-Clay model, a lot of merits of the improved model are discovered: the influence of anisotropy can be reflected better; the stress-strain characteristics of triaxial extension can be described more reasonably; the soften phenomenon of some stress path, such as , can be described.