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一种考虑恢复的盐岩流变-损伤本构模型
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作者 王贵君 蔡晟鑫 +2 位作者 刘熙媛 李东 张岭 《太原理工大学学报》 CAS 北大核心 2018年第3期423-427,共5页
为研究盐岩流变-损伤恢复特性,在已有的流变-损伤本构模型基础上,考虑因卸载引起的流变-损伤恢复,建立了一种考虑恢复的盐岩流变-损伤本构模型,并根据已有的试验数据验证模型的正确性。研究表明,盐岩流变-损伤恢复具有明显的"过渡&... 为研究盐岩流变-损伤恢复特性,在已有的流变-损伤本构模型基础上,考虑因卸载引起的流变-损伤恢复,建立了一种考虑恢复的盐岩流变-损伤本构模型,并根据已有的试验数据验证模型的正确性。研究表明,盐岩流变-损伤恢复具有明显的"过渡"特点,盐岩经历恢复后,流变-损伤速率比恢复前有所降低。该盐岩本构模型继承了原模型很好描述盐岩流变-损伤-破坏全过程的特性,并且能真实反映由卸载触发的流变-损伤恢复,表征盐岩稳态流变-损伤和恢复的模型参数离散性不大。此外,还分析了盐岩流变-损伤和恢复的影响因素。 展开更多
关键词 盐岩 流变-损伤 恢复 本构模型
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A nonlinear rheological damage model of hard rock 被引量:11
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作者 HU Bo YANG Sheng-qi XU Peng 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1665-1677,共13页
By adopting cyclic increment loading and unloading method, time-independent and time-dependent strains can be separated. It is more reasonable to describe the reversible and the irreversible deformations of sample sep... By adopting cyclic increment loading and unloading method, time-independent and time-dependent strains can be separated. It is more reasonable to describe the reversible and the irreversible deformations of sample separately during creep process. A nonlinear elastic-visco-plastic rheological model is presented to characterize the time-based deformational behavior of hard rock. Specifically, a spring element is used to describe reversible instantaneous elastic deformation. A reversible nonlinear visco-elastic (RNVE) model is developed to characterize recoverable visco-elastic response. A combined model, which contains a fractional derivative dashpot in series with another Hook’s body, and a St. Venant body in parallel with them, is proposed to describe irreversible visco-plastic deformation. Furthermore, a three-stage damage equation based on strain energy is developed in the visco-plastic portion and then nonlinear elastic-visco-plastic rheological damage model is established to explain the trimodal creep response of hard rock. Finally, the proposed model is validated by a laboratory triaxial rheological experiment. Comparing with theoretical and experimental results, this rheological damage model characterizes well the reversible and irreversible deformations of the sample, especially the tertiary creep behavior. 展开更多
关键词 Hard rock multi-step loading and unloading cycles NONLINEAR DAMAGE rheological model
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A power function model for simulating creep mechanical properties of salt rock 被引量:2
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作者 LI Huan Ngaha Tiedeu WILLIAM +2 位作者 Jaak DAEMEN ZHOU Jun MA Chang-kun 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第2期578-591,共14页
In this paper,a new micro-creep model of salt rock is proposed based on a linear parallel bonded model(LPBM)using the two-dimensional particle flow code(PFC2D).The power function weakening form is assumed to describe ... In this paper,a new micro-creep model of salt rock is proposed based on a linear parallel bonded model(LPBM)using the two-dimensional particle flow code(PFC2D).The power function weakening form is assumed to describe the variation of the parallel bonded diameter(PBD)over time.By comparing with the parallel-bonded stress corrosion(PSC)model,a smaller stress fluctuation and smoother creep strain−time curves can be obtained by this power function model at the same stress level.The validity and adaptability of the model to simulate creep deformation of salt rock are verified through comparing the laboratory creep test curves and the Burgers model fitting result.The numerical results reveal that this model can be capable of capturing the creep deformation and damage behavior from the laboratory observations. 展开更多
关键词 salt rock creep damage particle flow code power function model
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Rheological properties of surrounding rock in deep hard rock tunnels and its reasonable support form 被引量:1
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作者 王辉 陈卫忠 +1 位作者 王清标 郑朋强 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第4期898-905,共8页
Second lining stability, which is the last protection in tunnel engineering, is critically important. The theological properties of the surrounding rock heavily affect second lining stability. In this work, we used la... Second lining stability, which is the last protection in tunnel engineering, is critically important. The theological properties of the surrounding rock heavily affect second lining stability. In this work, we used laboratory triaxial compressive rheological limestone tests to study nonlinear creep damage characteristics of surrounding rock mass in construction projects. We established a nonlinear creep damage constitutive model for the rock mass, as well as a constitutive model numerical implementation made by programming. Second, we introduced a new foam concrete with higher compression performance and good ductility and studied its mechanical properties through uniaxial and triaxial tests. This concrete was used as the filling material for the reserved deformation layer between the primary support and second lining. Finally, we proposed a high efficiency and accuracy staged optimization method. The minimum reserved deformation layer thickness was established as the optimization goal, and the presence of plastic strain in the second lining after 100 years of surrounding rock creep was used as an evaluation index. Reserved deformation layer thickness optimization analysis reveals no plastic strain in the second lining when the reserved deformation minimum thickness layer is 28.50 cm. The results show that the new foam concrete used as a reserved deformation layer filling material can absorb creep deformation of surrounding rock mass, reduce second lining deformation that leads to plastic strain, and ensure long-term second lining stability. 展开更多
关键词 rheological test constitutive model staged optimization analysis reasonable support form
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