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Study on the constitutive model for jointed rock mass.

Xu Q, Chen J, Li J, Zhao C, Yuan C - PLoS ONE (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: School of Civil and Hydraulic Eng., Dalian University of Technology, Dalian, China.

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.

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Related in: MedlinePlus

The joint net work of rocks
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pone.0121850.g001: The joint net work of rocks

Mentions: Fig 1 shows rock bridges exist in jointed rock masses because of the non-persistent nature of joints. In order to calculate the decrease of strength of jointed rock masses in different directions, It defines the mechanical persistence ratio of rock mass as that the ratio of joint network on the shear failure path when jointed rock mass is sheared to damaged state along a certain direction[15]. Fig 2 shows that the mechanical persistence ratio k is calculated bykβ0=∑JL∑JL+∑RBR(2)where JL and RBR are the projection length of joints and rock bridges in the shear failure path respectively. β0 is the visual angle, which can be used to express the direction of joints.


Study on the constitutive model for jointed rock mass.

Xu Q, Chen J, Li J, Zhao C, Yuan C - PLoS ONE (2015)

The joint net work of rocks
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401509&req=5

pone.0121850.g001: The joint net work of rocks
Mentions: Fig 1 shows rock bridges exist in jointed rock masses because of the non-persistent nature of joints. In order to calculate the decrease of strength of jointed rock masses in different directions, It defines the mechanical persistence ratio of rock mass as that the ratio of joint network on the shear failure path when jointed rock mass is sheared to damaged state along a certain direction[15]. Fig 2 shows that the mechanical persistence ratio k is calculated bykβ0=∑JL∑JL+∑RBR(2)where JL and RBR are the projection length of joints and rock bridges in the shear failure path respectively. β0 is the visual angle, which can be used to express the direction of joints.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: School of Civil and Hydraulic Eng., Dalian University of Technology, Dalian, China.

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.

Show MeSH
Related in: MedlinePlus