期刊
ENGINEERING COMPUTATIONS
卷 39, 期 10, 页码 3376-3399出版社
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/EC-08-2021-0493
关键词
Rockfill materials; Anisotropy; Grain crushing; Constitutive model; Rockfill dam
类别
资金
- National Key R&D Program of China [2021YFC3090101]
- National Natural Science Foundation of China [U1965206, 51979143]
This study developed a reasonable and practical constitutive model for rockfill materials, considering the effects of anisotropy and grain crushing. The stress-strain behaviors of high core rockfill dams were simulated using the developed model and validated with laboratory tests and situ monitoring data. A new anisotropic state parameter was proposed and the elastoplastic model was verified for the first time with situ monitoring data. The results demonstrated the reliability and superiority of the developed model compared to the traditional model.
Purpose The stress-strain behaviors of rockfill materials in dams are significantly affected by the anisotropy and grain crushing. However, these factors are rarely considered in numerical simulations of high rockfill dams. This study intends to develop a reasonable and practical constitutive model for rockfill materials to overcome the above problems. Design/methodology/approach The effects of anisotropy and grain crushing are comprehensively considered by the spatial position of the reference state line. After the improved generalized plasticity model for rockfill materials (referred to as the PZR model) is developed and verified by laboratory tests, it is used with the finite element method to simulate the stress-strain behaviors of the Nuozhadu high core rockfill dam. Findings The simulated results agree well with the laboratory tests data and the situ monitoring data, verifying the reliability and practicability of the developed PZR model. Originality/value A new anisotropic state parameter is proposed to reflect the nonmonotonic variation in the strength as the major principal stress direction angle varies. This advantage is verified by the simulation of a set of conventional triaxial tests with different inclination angles of the compaction plane. 2) This is the first time that the elastoplastic model is verified by the situ monitoring data of high core rockfill dams. The numerical simulation results show that the PZR model can well reflect the stress-strain characteristics of rockfill materials in high core rockfill dams and is better than the traditional EB model.
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