Creep damage constitutive model of rock based on the mechanisms of crack-initiated damage and extended damage

蠕动 本构方程 损伤力学 岩土工程 材料科学 地质学 法律工程学 结构工程 工程类 复合材料 有限元法
作者
Tianbin Li,Chao Chen,Feng Peng,Chunchi Ma,Mou Li,Yixiang Wang
出处
期刊:Underground Space [Elsevier BV]
卷期号:18: 295-313 被引量:3
标识
DOI:10.1016/j.undsp.2023.12.008
摘要

Since the classical element model cannot describe the nonlinear characteristics of rock during the entire compressive creep process, nonlinear elements and creep damage are generally introduced in the model to resolve this issue. However, several previous studies have reckoned that creep damage in rock only occurs in the accelerated creep stage and is only described by the Weibull distribution. Nevertheless, the creep damage mechanism of rocks is still not clearly understood. In this study, a reasonable representation of the damage variables of solid materials is presented. Specifically, based on the Gurson damage model, the damage state functions reflecting the constant creep stage and accelerated creep stage of rock are established. Further, the one-dimensional and three-dimensional creep damage constitutive equations of rock are derived by modifying the Nishihara model. Finally, the creep-acoustic emission tests of phyllite under different confining pressures are conducted to examine the creep damage characteristics of phyllite. And the proposed constitutive model is verified by analyzing the results of creep tests performed on saturated phyllite. Overall, this study reveals the relationship between the creep characteristics of rocks and the corresponding damage evolution pattern, which bridges the gap between the traditional theory and the quantitative analysis of rock creep and its damage pattern.
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