Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters

LIU Guo-ming; CHEN Ze-qin; WU Le-hai

doi:10.16285/j.rsm.2016.0574

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Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters

更新时间：2026-06-25

- Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters
- Vol. 39, Issue 3, Pages: 823-830(2018)
- 作者机构：
  
  福州大学土木工程学院,福建,福州,350108
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.0574
  CLC： TU43
- Online First：06 June 2018，
  
  Published：2018
- 稿件说明：
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LIU Guo-ming, CHEN Ze-qin, WU Le-hai. Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters[J]. 2018, 39(3): 823-830.
DOI：

LIU Guo-ming, CHEN Ze-qin, WU Le-hai. Improvement of Gudehus-Bauer hypoplastic constitutive model for rockfill materials and the determination of model parameters[J]. 2018, 39(3): 823-830. DOI： 10.16285/j.rsm.2016.0574.

摘要

研究了Gudehus-Bauer亚塑性本构模型和模型参数的求取方法。采用侧限压缩试验曲线求取模型参数颗粒硬度hs和指数n。根据模型方程的推导，建立了拟合指数和与围压之间的关系，并提出了新的拟合参数。考虑到堆石料具有明显的剪胀、剪缩性，在Gudehus-Bauer模型线性项中增加了主要控制体积应变项，以改善模型对堆石料体积应变曲线的描述。采用堆石料大型侧限压缩试验、常规三轴试验分别验证了新的拟合参数和改进后的Gudehus-Bauer亚塑性本构模型。与堆石料试验成果比较，提出的新拟合参数与改进后的Gudehus-Bauer亚塑性本构模型可以较好地模拟堆石料的应力-应变特性，并较好地改善了堆石料体变曲线的模拟结果。对改进后的模型作了常规三轴加、卸载模拟，模拟结果反映了改进的Gudehus-Bauer亚塑性本构模型具有一定的卸载适应性。

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

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 rockfill 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.

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