Study on the constitutive model for jointed rock mass

Area of Science:

• Geotechnical Engineering
• Continuum Mechanics
• Rock Mechanics

Background:

• Jointed rock masses exhibit complex mechanical behaviors influenced by factors like persistence ratio and stress conditions.
• Existing constitutive models often simplify or neglect the anisotropic nature of plastic strain accumulation in such materials.

Purpose of the Study:

• To propose a novel elasto-plastic constitutive model for jointed rock masses.
• To incorporate the effects of persistence ratio at different visual angles and anisotropic plastic strain.
• To develop an anisotropic yield strength criterion that considers friction angle, cohesion, and principal stress orientation.

Main Methods:

• Development of a new elasto-plastic constitutive model.
• Formulation of an anisotropic yield strength criterion.
• Numerical simulations to analyze and verify the model's performance.

Main Results:

• The proposed model accurately considers the persistence ratio across various visual angles.
• Anisotropic plastic strain increase is effectively modeled.
• Numerical examples validate the model's high precision in calculating displacement, stress, and plastic strain.

Conclusions:

• The developed elasto-plastic constitutive model provides a more accurate representation of jointed rock mass behavior.
• The model's ability to handle anisotropic yield criteria and plastic strain makes it suitable for complex engineering applications.