scholarly journals Multiscale damage constitutive model of jointed rock masses based on the influence of crack initiation

2021 ◽  
Vol 861 (2) ◽  
pp. 022006
Author(s):  
Huiguan Chen ◽  
Cheng Zhao
Keyword(s):  
Crack Initiation ◽  
Constitutive Model ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Damage Constitutive Model

Application of Damage Model in Stability Analysis of ShuangjiangKou Underground Caverns

2011 ◽  
Vol 462-463 ◽  
pp. 1391-1396
Author(s):  
Lu Xiang ◽  
Wei Shen Zhu ◽  
Qing Song Ma ◽  
Kui Zhou
Keyword(s):  
Constitutive Model ◽  
Evolution Equation ◽  
Damage Evolution ◽  
Jointed Rock ◽  
Rock Masses ◽  
Damage Evolution Equation ◽  
Jointed Rock Masses ◽  
Underground Caverns ◽  
Damage Constitutive Model ◽  
The Stability

A damage constitutive model was established to evaluate the stability of jointed rock masses around the underground caverns of Shuangjiangkou Hydropower Station. In this model, a second-order damage tensor was formulated to describe the initial geometric imperfection of jointed rock masses. A failure criterion for crack coalescence and a damage evolution equation were proposed by considering the secondary cracks induced by excavations according to the fracture mechanics principles. A subprogram under the framework of FLAC-3D was developed for the damage constitutive model and the damage evolution equation. The model and program were then applied in the stability assessment for the Shuangjiangkou underground cavern group.

scholarly journals Anisotropic Constitutive Model of Intermittent Columnar Jointed Rock Masses Based on the Cosserat Theory

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 823 ◽  
Author(s):  
Wenbin Lu ◽  
Zhende Zhu ◽  
Xiangcheng Que ◽  
Cong Zhang ◽  
Yanxin He
Keyword(s):  
Rock Mass ◽  
Constitutive Model ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Rock Masses ◽  
Cosserat Theory ◽  
Tunnel Excavation ◽  
Jointed Rock Masses ◽  
Columnar Jointed Rock Mass ◽  
Anisotropic Constitutive Model

In this work, an anisotropic constitutive model of hexagonal columnar jointed rock masses is established to describe the distribution law of deformation and the failure of columnar joint caverns under anisotropic conditions, and is implemented to study the columnar jointed rock mass at the dam site of the Baihetan Hydropower Station on the Jinsha River. The model is based on the Cosserat theory and considers the mesoscopic bending effect on the macroscopic mean. The influences of joint plane inclination on equivalent anisotropic elastic parameters are discussed via the introduction of an off-axis transformation matrix and the analysis of an example. It is also pointed out that the six-prism columnar jointed rock mass changes from transverse isotropy to anisotropy under the influence of the angle. A numerical calculation program of the Cosserat constitutive model is developed and is applied to the simulation calculation of a Baihetan diversion tunnel to compare and analyze the respective plastic zones and stress distributions after tunnel excavation under both isotropic and anisotropic conditions. The results reveal that, compared with the isotropic model, the proposed Cosserat anisotropic model better reflects the state of stress and asymmetric distribution of the plastic zone after tunnel excavation, and the actual deformation of the surrounding rock of the tunnel is greater than that calculated by the isotropic method. The results aid in a better understanding of the mechanical properties of rock masses.

A constitutive model for jointed rock masses

1988 ◽  
Vol 11 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Ching‐Shung Chang ◽  
Tsan‐Hwei Huang
Keyword(s):  
Constitutive Model ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses

A constitutive model of highly jointed rock masses

1992 ◽  
Vol 13 (3) ◽  
pp. 217-246 ◽  
Author(s):  
Ming Cai ◽  
Hideyuki Horii
Keyword(s):  
Constitutive Model ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses

Crack Propagation of Jointed Rock and Application

2011 ◽  
Vol 117-119 ◽  
pp. 476-479
Author(s):  
Jing Wang ◽  
Wei Shen Zhu ◽  
Hai Ping Ma
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Failure Process ◽  
Jointed Rock ◽  
Rock Masses ◽  
Stress Strain ◽  
Jointed Rock Masses

Brittle media, such as rock mass, usually contain a great number of joints or cracks, which lead to varying mechanical properties and failure behaviors of different rock masses. In this paper, the DDARF method is adopted to simulate the crack initiation, propagation, coalescence and failure process in rock masses prefabricated with the different crack number and spacing under loading. The corresponding stress-strain curves and strength envelope are obtained. The parameters are applied in a case study. The differences in the failure behaviors of the intact and jointed rock masses after cavern excavation are analyzed and compared.

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