The creep model based on nonlinear Newton body under different temperature conditions

Area of Science:

• Geotechnical Engineering
• Materials Science
• Rock Mechanics

Background:

• Understanding rock creep deformation is crucial for assessing the long-term stability of geotechnical structures.
• Existing models often lack accuracy in predicting creep behavior across diverse temperature conditions.

Purpose of the Study:

• To develop and validate a novel nonlinear Burgers creep model for rocks under varying temperatures.
• To quantitatively analyze the influence of model parameters on rock creep deformation and their temperature dependence.

Main Methods:

• Modification of the classical Burgers model by integrating a nonlinear Newton body.
• Identification of creep model parameters and analysis of their relationship with temperature.
• Validation of the model through high correlation coefficients (R² > 0.98) with experimental data.

Main Results:

• The enhanced model accurately describes decay, constant, and tertiary creep stages under different temperatures.
• Quantitative relationships between model parameters (G1, G2, η1, η2) and temperature were established.
• Increased G1, G2, and η1 enhance creep in the constant stage, while increased η2 promotes decay creep.

Conclusions:

• The developed model accurately predicts rock deformation trends over time at various temperatures.
• This research provides a theoretical foundation for long-term stability analysis in geotechnical engineering projects.