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. ABSTRACTA 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 MajorModels, Theoretical*MinorAlgorithmsComputer Simulation Related in: MedlinePlus © Copyright Policy Related In: Results  -  Collection License getmorefigures.php?uid=PMC4401509&req=5 .flowplayer { width: px; height: px; } pone.0121850.g008: The strength of σ3 when the relation of β0 and β is given((a) The strength of σ3 when β = β0; (b) The strength of σ3 when β = β0+30°; (c) The strength of σ3 when β = β0+60°; (d) The strength of σ3 when β = β0+90°; (e) The strength of σ3 when β = β0+120°; (f) The strength of σ3 when β = β0+150°) Mentions: Through observing the results of Figs 5–8, they show that the yield strength criterion f in plane of jointed rock mass is not only related to the friction angle φβ0 and cohesion cβ0 of jointed rock masses in direction of β0(the visual angle). The yield strength criterion f is also related to β (the intersection angle between the visual angle and the directions of the maximum principal stresses). The yield strength criterion f has the relation of φβ0 and cβ0 only when βmin≤β≤βmax. The relation of β and β0 is also important to the yield strength criterion f. The different relation of β and β0 leads to different yield strength criterion f. In some special relation of β and β0, such as Fig 8 (c), the friction angle φβ0 and cohesion cβ0 has no use for the yield strength criterion f. In other word, the persistence ratio k has no use for the yield strength criterion f in some special condition.

Study on the constitutive model for jointed rock mass.

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

Related In: Results  -  Collection

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pone.0121850.g008: The strength of σ3 when the relation of β0 and β is given((a) The strength of σ3 when β = β0; (b) The strength of σ3 when β = β0+30°; (c) The strength of σ3 when β = β0+60°; (d) The strength of σ3 when β = β0+90°; (e) The strength of σ3 when β = β0+120°; (f) The strength of σ3 when β = β0+150°)
Mentions: Through observing the results of Figs 5–8, they show that the yield strength criterion f in plane of jointed rock mass is not only related to the friction angle φβ0 and cohesion cβ0 of jointed rock masses in direction of β0(the visual angle). The yield strength criterion f is also related to β (the intersection angle between the visual angle and the directions of the maximum principal stresses). The yield strength criterion f has the relation of φβ0 and cβ0 only when βmin≤β≤βmax. The relation of β and β0 is also important to the yield strength criterion f. The different relation of β and β0 leads to different yield strength criterion f. In some special relation of β and β0, such as Fig 8 (c), the friction angle φβ0 and cohesion cβ0 has no use for the yield strength criterion f. In other word, the persistence ratio k has no use for the yield strength criterion f in some special condition.

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