SSUH model: A small-strain extension of the unified hardening model
SSUH model: A small-strain extension of the unified hardening model
复制标题
SSUH 模型：统一硬化模型的小应变扩展
DOI：
10.1007/s11431-015-5914-0
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发表时间：
2016-01
影响因子：
4.6
通讯作者：
Zhu EY
中科院分区：
文献类型：
--
作者：
Yao YP;Qu S;Yin ZY;Zhu EY
针对粘土的小应变特性，提出了小应变统一硬化(SSUH)模型。该模型是超固结(OC)粘土统一硬化(UH)模型的推广，考虑了小应变刚度。与UH模型相比，SSUH模型的新特点包括：(A)新的弹性滞回应力-应变关系，用于评估小应变下的刚度退化并在循环加载条件下产生滞回曲线；(B)修订的统一硬化参数，以提高小应变时的塑性刚度；以及(C)新的超固结参数，这是使UH模型有效地处理弹性滞回应力-应变关系的关键。通过这些改进，SSUH模型可以描述高初始刚度和小应变下高度非线性的应力-应变关系，以及OC粘土在大应变下的剪胀和应变硬化/软化行为。与修正的CaM-Clay(MCC)模型相比，该模型需要两个与应变有关的小参数，这些参数很容易通过室内试验获得。最后，通过大应变排水三轴压缩试验、小应变排水三轴压缩/拉伸试验、小应变不排水压缩试验和排水循环恒径向应力试验对新模型进行了验证。
A small strain unified hardening (SSUH) model is proposed in the present study to tackle the small strain behavior of clay. The model is an extension of the unified hardening (UH) model for overconsolidated (OC) clays accounting for the small strain stiffness. The new features of the SSUH model over the UH model include: (a) a new elastic hysteretic stress-strain relationship to evaluate the stiffness degradation at small strains and to generate the hysteresis loop under cyclic loading condition; (b) a revised unified hardening parameter to enhance the plastic stiffness at small strains; and (c) a new overconsolidation parameter, which is crucial to make the UH model working with the elastic hysteretic stress-strain relationship effectively. With these enhancements, the SSUH model can describe a high initial stiffness and the highly nonlinear stress-strain relationship at small strains, in addition to the shear dilatancy and strain hardening/softening behaviors of OC clays at large strains. In comparison with the Modified Cam-clay (MCC) model, the proposed model needs two more small strain related parameters, which can be easily obtained from laboratory tests. Finally, some drained triaxial compression tests at large strains, drained triaxial compression/extension tests at small strains, an undrained compression test at small strains and a drained cyclic constant radial stress test are employed to validate the new model.
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影响因子：
5.8
作者：
A. Puzrin;J. Burland
通讯作者：
A. Puzrin;J. Burland
DOI：
10.1061/(asce)1090-0241(2007)133:1(72
发表时间：
2007
影响因子：
3.9
作者：
M. Santagata;J. Germaine;C. Ladd
通讯作者：
M. Santagata;J. Germaine;C. Ladd
影响因子：
5.8
作者：
S. Stallebrass;R. Taylor
通讯作者：
S. Stallebrass;R. Taylor
影响因子：
5.8
作者：
A. Puzrin;J. Burland
通讯作者：
A. Puzrin;J. Burland
影响因子：
2.1
作者：
A. Al-Tabbaa;D. Wood
通讯作者：
A. Al-Tabbaa;D. Wood