Brittle Damage and Coalescence Model of Jointed Rock Mass

Chen, Wei Zhong; Wang, Chong Ge; Li, S.C.; Qiu, Xiuli; Yang, Chen-Cheng

doi:10.4028/www.scientific.net/kem.261-263.201

Cited by 2 publications

(3 citation statements)

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“…Based on the defined additional strain energy of rock macro-damage by Chen and Li (2000), the damage strain energy can be expressed using Eq. (3).…”

Section: Statistical Constitutive Models Of Rock Macro-damagementioning

confidence: 99%

“…where α denotes the joint inclination angle, a denotes the half-length joint, φ denotes the internal friction angle of the rock material (f = tan φ), V denotes the volume of the elastomer, σn denotes the normal stress on the joint surface and δ denotes the amount of relative slip caused by the joint surface area A, crack expansion length l and shear stress. Three parameters can be calculated with relative expressions from previous studies (Chen and Li, 2000;Grady and Kipp, 1980;Nemat and Obata, 1988). The stress-intensity factor of a single joint is different from that of multi-row parallel discontinuous joints, as expressed in Eq.…”

Section: Statistical Constitutive Models Of Rock Macro-damagementioning

confidence: 99%

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Damage Mechanism on Different Joint Types of Plain Concrete under Uniaxial Compression

Guo¹,

Cui²,

Liu³

2023

JJCE

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Excavation of tunnels or chambers causes crack initiation, propagation and coalescence, resulting in the instability and destruction of underground projects. Understanding the damage mechanism of joint rock-like materials is important for maintaining the stability of concrete construction. Based on the Mohr–Coulomb criterion and Lemaitre strain equivalence hypothesis, the coupling-damage constitutive model of rock masses was improved for application to plain concrete. Parameters including the mesoscopic and macro-meso coupling damage variables, as well as the fractal dimension, were calculated to realize the non-linear mechanical behaviour during damage evolution. The rationality of the model was verified by comparing experimental and theoretical parameters. Results revealed that the coupled-damage constitutive model of rock masses has a good applicability to plain concrete. Furthermore, two main factors affected the damage deformation: the number of joints and the inclination angle. As the number of joints increased, the early damage accumulation increased and the inflection point of the damage rate occurred in advance. The damage deformation varied significantly when the inclination angle was changed. The cumulative damage curve of the plain-concrete specimens is shown as the evolution law of an S-type curve. Both peak strength and elastic modulus were positively correlated with the damage variable. Moreover, a smaller peak strength resulted in a larger fractal dimension and coupling-damage variable. KEYWORDS: Rock mass, Joint inclination angle, Mesoscopic, Macroscopic, Fractal dimension, Coupling-damage constitutive model.

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“…Based on the defined additional strain energy of rock macro-damage by Chen and Li (2000), the damage strain energy can be expressed using Eq. (3).…”

Section: Statistical Constitutive Models Of Rock Macro-damagementioning

confidence: 99%

Section: Statistical Constitutive Models Of Rock Macro-damagementioning

confidence: 99%

Damage Mechanism on Different Joint Types of Plain Concrete under Uniaxial Compression

Guo¹,

Cui²,

Liu³

2023

JJCE

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“…1. The theoretical studies of mining subsidence have been found that there are five main factors influenced subsidence value [6,7,8], they are coal seam height, coal body strength, abutment pressure, mining depth and the length of working face respectively. The greater the coal seam strength is, the greater stiffness becomes.…”

Section: The Relationship Between Underground Excavation and Subsidencementioning

confidence: 99%

Study on the Structure Model and Controlling Method of Subsidence in Flat Seam and Deep Mining

Wang

Chen

Pan

2006

KEM

Self Cite

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The stratum movement and surface subsidence is considered as a whole system in the research work. The key of the surface subsidence control lies first in having thorough knowledge of the dynamic changeable of the overlaying strata movement as the face advances so as to establish the corresponding structure mechanics subsidence model in flat seam and deep mining. The common characteristic of stratum movement and the development procedure of crack arch are described in this paper. The structure constituents of subsidence and their influencing factors are also analyzed. Meanwhile, the surface subsidence is determined by the compressing of coal wall and the bending of the overlying strata. Based on the ground observation by the global positioning system, the boundary angle and the motion angle are determined. Furthermore, according to the research law, one can predict and control the surface subsidence damages for the special geologic conditions.

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Brittle Damage and Coalescence Model of Jointed Rock Mass

Cited by 2 publications

References 0 publications

Damage Mechanism on Different Joint Types of Plain Concrete under Uniaxial Compression

Damage Mechanism on Different Joint Types of Plain Concrete under Uniaxial Compression

Study on the Structure Model and Controlling Method of Subsidence in Flat Seam and Deep Mining

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