岩土力学2018，Vol.39Issue(3)：823-830,8.DOI:10.16285/j.rsm.2016.0574
堆石料Gudehus-Bauer亚塑性本构模型改进及参数确定方法
Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters
摘要
Abstract
Gudehus-Bauer hypoplastic constitutive model and the determination of its parameters are studied in the paper.Confined compression test is used to determine the parameters hs and n of hypoplastic constitutive model for rockfill materials.According to the derivation of the model,the relationships between the parameters α,β and the confining pressure are established,and new fitting parameters are proposed.Considering the dilatancy for rockfill materials,a new term of volumetric strain is added into the linear term in the model with a good fit to the axial strain-volumetric stain curve of triaxial consolidated drained tests.The new parameters of the model and the improvement on Gudehus-Bauer hypoplastic constitutive model are verified by means of rockfill large-scale confined compression test and triaxial consolidated drained tests.Compared with the test results of rockfill materials,the present model and its parameters can simulate the stress-strain characteristics of rockfili materials,and can improve the simulated axial strain-volumetric stain curve.Finally,the simulation to the triaxial consolidated drained test in loading-unloading condition by the improved Gudehus-Bauer hypoplastic constitutive model is carried out,and the results show that the improved model has a certain application of unloading.关键词
Gudehus-Bauer模型/堆石料/亚塑性/侧限压缩/参数改进方法Key words
Gudehus-Bauer model/rockfill materials/hypoplasticity/confined compression/improved method of parameter分类
建筑与水利引用本文复制引用
刘国明,陈泽钦,吴乐海..堆石料Gudehus-Bauer亚塑性本构模型改进及参数确定方法[J].岩土力学,2018,39(3):823-830,8.基金项目
福建省自然科学基金计划项目(No.2014J0101).This work was supported by Fujian Provincial Natural Science Foundation Projects (2014J0101). （No.2014J0101）
