Stress relaxation behavior of silty mudstone considering the effect of confining pressure

Yu, Huaichang; Zhang, Xingsheng; Liu, Handong; Huang, Zhiquan; Shi, Guangcheng

doi:10.1007/s12665-016-5771-6

Cited by 14 publications

(2 citation statements)

References 16 publications

(13 reference statements)

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“…Nevertheless, the models are confusingly used in the creep behavior and stress relaxation behavior descriptions of rocks; specifically, there is a common phenomenon where one constitutive model is developed for one rock's creep behavior, but another model is built for this rock's stress relaxation behavior. For example, Li et al [16] proposed an improved nonlinear Burgers model for the creep behavior of silty mudstone, while Yu et al [17] took a modified generalized Maxwell model for the stress relaxation behavior of silty mudstone. Both testing samples in the two studies were silty mudstones and both the creep tests and the stress relaxation tests were conducted in the triaxial compression state, but the two constitutive models they developed were completely different.…”

Section: Introductionmentioning

confidence: 99%

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A Core Damage Constitutive Model for the Time-Dependent Creep and Relaxation Behavior of Coal

et al. 2022

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The creep and stress relaxation behaviors of coal are common in coal mining. The unified constitutive model is suitable to describe and predict both the creep and relaxation evolution characteristics of rocks. The generalized Kelvin model is the core element for traditional and improved component models to reflect both the nonlinear creep and relaxation. In this paper, an improved core damage model, which could both reflect the creep and stress relaxation in relation to the damage evolution, was established based on a comparison of the traditional and improved component models, and the responding constitutive equations (creep and stress relaxation equation) at constant stress/strain were deduced. Then, the core damage model was validated to the uniaxial compressive multistage creep and stress relaxation test results of coal, showing that the model curves had great accordance with the experimental data. Moreover, the model comparisons on accuracy, parameter meaning, and popularization among the core damage model, hardening-damage model, and the fractional derivative model were further discussed. The results showed that the parameters in the core damage model had clear and brief physical significances. The core damage model was also popularized to depict the time-dependent behaviors of other rocks, showing great accuracy.

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Section: Introductionmentioning

confidence: 99%

“…(c) Axial strain of a silty mudstone at the stresses of 3, 9, 15, and 17.7 MPa in triaxial compression[16]. (d) Axial stress of the silty mudstone at strains of 0.2%, 0.6%, and 1.27% in the triaxial compressive stress relaxation tests[17].…”

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confidence: 99%