Abstract
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.
摘要
通过循环增量加–卸载的方法, 可以将岩石在恒定载荷下的时效变形进一步分离成瞬时弹性应 变、瞬时塑性应变、黏弹性应变和黏塑性应变。在蠕变过程中分别描述试样的可恢复和不可恢复的变 形是比较合理的。因此, 本文提出了一种可以描述硬岩时效变形的非线性流变模型。其中该模型采用 一个弹簧元件来描述可恢复的瞬时弹性变形; 一个改进的非线性黏弹性模型(RNVE)可以描述可恢 复的黏弹性变形; 一个分数阶黏壶和弹簧元件串联的组合模型与另一个塑性摩擦块并联形成一个新的 组合模型来描述不可恢复的瞬时塑性变形和黏塑性变形。此外, 在黏塑性元件中引入一个基于应变能 的含三阶段损伤模型来描述硬岩的加速蠕变变形。最后, 通过流变试验验证提出模型的合理性。对比 试验结果和理论结果, 本文提出的流变损伤模型可以很好地描述硬岩的可恢复和不可恢复变形, 尤其 是描述加速蠕变变形。
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Foundation item: Project(BK20150005) supported by the Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars, China; Project(2015XKZD05) supported by the Fundamental Research Funds for the Central Universities, China
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Hu, B., Yang, Sq. & Xu, P. A nonlinear rheological damage model of hard rock. J. Cent. South Univ. 25, 1665–1677 (2018). https://doi.org/10.1007/s11771-018-3858-9
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DOI: https://doi.org/10.1007/s11771-018-3858-9