Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model
Abstract
:1. Introduction
2. Simulation Methodology and Validation
2.1. Simulation Methodology
2.1.1. The Flat Joint Model (FJM)
2.1.2. The Smooth Joint Model (SJM)
2.2. Model Calibration and Validation
2.2.1. Model Setup and Calibration
2.2.2. Model Validation
3. Simulation Results
3.1. Failure Strength
3.2. Degree of Fracturing
4. Discussion
5. Conclusions
- The failure strength of the jointed rock mass was strongly influenced by the joint elasticity. A positive relationship and a negative relationship between the joint elasticity and failure strength of the jointed rock mass were observed from the simulation results when and , respectively. However, the joint elasticity had limited effect on the failure strength when .
- The failure mode of the jointed rock mass was closely related to the joint elasticity. When , a failure mode transition from sliding failure to mixed failure mode was observed as joint elasticity became smaller. When , the jointed rock mass was prone to fail in a tensile failure mode with softer joint.
- A close connection between the degree of fracturing of the jointed rock mass and joint elasticity was found under uniaxial compression. When , more micro-cracks appeared in the jointed rock mass as the joint became softer. However, it had limited effect on the degree of fracturing when .
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Reference | Joint Type | Test | Research Scope |
---|---|---|---|
[27] | A single non-persistent joint | UC | Compressive study on the SJM. |
[7] | A single persistent joint | UC and TC | Parametric study on the SJM. |
[28] | A single roughness joint | DS | Explore the SJM parameters effect on the shear behaviour of the jointed rock mass. |
[29] | A single roughness joint | DS | Joint roughness effect on shear behaviours. |
[35] | A set of persistent parallel joints | UC | Spacing and number of parallel joints effect on failure behaviours of the jointed rock mass. |
[31] | A set of non-persistent joints | UC | Joint orientations and continuity factors effect on the deformation behaviour of the jointed rock mass. |
[32] | A set of persistent parallel joints | UC | Modeling of mechanical behaviour of transversely isotropic rock. |
[36] | A set of non-persistent joints | UC | Modeling of inherently anisotropic rocks. |
[34] | Random joints | UC | Study of scale effect on intact rock strength. |
This study | A single persistent joint | UC | Investigation of joint elasticity effect on the failure behaviours of rock masses |
Intact Rock Properties | Joint Properties | |||||
---|---|---|---|---|---|---|
Type of Test | UCS (MPa) | Tensile Strength (MPa) | Young’s Modulus (GPa) | Poisson’s Ratio | Friction Angle (°) | Cohesion (MPa) |
Experimental | 50.80 | 4.00 | 11.00 | 0.20 | 32.00 | 2.20 |
Numerical | 50.17 | 4.08 | 11.02 | 0.20 | 31.79 | 2.19 |
COV (%) | 0.51 | 1.40 | 0.13 | 0.00 | 0.46 | 0.32 |
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Yuan, Y.; Zhou, C.; Wang, Z.; Du, J. Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model. Energies 2018, 11, 2968. https://doi.org/10.3390/en11112968
Yuan Y, Zhou C, Wang Z, Du J. Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model. Energies. 2018; 11(11):2968. https://doi.org/10.3390/en11112968
Chicago/Turabian StyleYuan, Yong, Changtai Zhou, Zhihe Wang, and Jifang Du. 2018. "Joint Elasticity Effect on the Failure Behaviours of Rock Masses using a Discrete Element Model" Energies 11, no. 11: 2968. https://doi.org/10.3390/en11112968