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Abstract
A new elasto-plastic constitutive model for jointed rock mass, which can consider the persistence ratio in different visual angle and anisotropic increase of plastic strain, is proposed. The proposed the yield strength criterion, which is anisotropic, is not only related to friction angle and cohesion of jointed rock masses at the visual angle but also related to the intersection angle between the visual angle and the directions of the principal stresses. Some numerical examples are given to analyze and verify the proposed constitutive model. The results show the proposed constitutive model has high precision to calculate displacement, stress and plastic strain and can be applied in engineering analysis.
Highlights
In the rock engineering, joints have significant effect on the stress-strain relationship of jointed rock mass
The other method is that special constitutive model is utilized to simulate jointed rock mass
Constitutive models for jointed rock masses are important for numerical modeling of the behavior of jointed rocks
Summary
Joints have significant effect on the stress-strain relationship of jointed rock mass. The other method is that special constitutive model is utilized to simulate jointed rock mass. Many constitutive models for rock joints, based on both empirical and theoretical approach, such as are summarized in [1]. Some researchers utilized joint factor to simulate jointed rock mass based on the finite element method[6]. Some researchers proposed the model for the equivalent elastic parameters of jointed rock mass[7,8]. The studies on elasto-plastic constitutive model for jointed rock mass are made. The influences of joints on the jointed rock mass are analyzed Based on these studies, a constitutive model for jointed rock mass, which can consider anisotropic strength of jointed rock mass and anisotropic increase of plastic strain, is constructed. The numerical examples are performed to analyze and verify the proposed constitutive model
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