Abstract
A novel numerical model in the framework of General Particle Dynamics is proposed to simulate the coupling effects of the vertical stress and the internal hydraulic pressure on the stress field around the tips of the flaw as well as the propagation and coalescence of cracks. In this proposed method, interaction among discrete particles is formulated using the virtual-bond method. Fractures of the virtual bonds among particles are determined by the Hoek–Brown damage evolution law of rocks. The fractured virtual bonds can only bear the compressive and frictional behaviors between two particles, while the unbroken virtual bonds can bear the tensile, shear and compressive behaviors. Furthermore, a novel generated particle method is proposed to simulate the flow of fissure water. The numerical results show that the water pressure plays a key role in the stress fields around flaw tips as well as the propagation paths and the coalescence pattern of wing and secondary cracks.
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Abbreviations
- D :
-
A disturbance coefficient
- E :
-
Young’s modulus
- f :
-
Interaction factor
- \(\rho\) :
-
Real-time mass density of particles
- \(\rho_{0}\) :
-
The initial density
- \(x^{\alpha }\) :
-
The spatial coordinate
- \(v^{\alpha }\) :
-
Velocity vector
- \(\sigma^{\alpha \beta }\) :
-
Cauchy stress tensor
- \(\omega\) :
-
Homogeneous index
- D m :
-
Damage factor
- G :
-
Shear modulus
- D a :
-
Particles with damaged bonds
- h :
-
Smoothing length
- v :
-
Poisson ratio
- k :
-
The modulus of volume elasticity
- N f :
-
Damage coefficient
- \(\rho_{\text{w}}\) :
-
Water particle density
- \(\rho_{\text{s}}\) :
-
Solid particle density
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Acknowledgements
This work was supported by Project (No. 0903005203452) supported by the Fundamental Research Funds for the Central Universities, Project 973 (Grant No. 2014CB046903), the National Natural Science Foundation of China (Nos. 51325903 and 51279218), The general project of Chongqing Foundation (cstc2014-jcyjA30016).
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Bi, J., Zhou, X.P. A Novel Numerical Algorithm for Simulation of Initiation, Propagation and Coalescence of Flaws Subject to Internal Fluid Pressure and Vertical Stress in the Framework of General Particle Dynamics. Rock Mech Rock Eng 50, 1833–1849 (2017). https://doi.org/10.1007/s00603-017-1204-4
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DOI: https://doi.org/10.1007/s00603-017-1204-4