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Failure characteristics of rocks with non-persistent joints under local load.
1School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing, China.
Plos One
|September 28, 2023
Summary
Investigating jointed rocks reveals that smaller loading areas and joint angles closer to 45° reduce rock strength. Loading area significantly impacts energy input and crack propagation, with larger areas increasing crack complexity.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Civil Engineering
Background:
- Jointed rocks are common in civil engineering projects.
- Instability and failure of jointed rocks pose significant risks to engineering safety.
Purpose of the Study:
- To numerically investigate the influence of loading area and joint angle on non-persistent jointed rocks.
- To analyze effects on strength dividing points, energy evolution, and crack distribution.
Main Methods:
- Numerical investigation of jointed rock mechanics.
- Analysis of varying loading areas and joint angles.
Main Results:
- Lower strength dividing points observed with joint angles closer to 45° and smaller loading areas.
- W-shaped distribution in total energy at peak and elastic energy vs. post-peak energy change amplitude.
- Loading area has a greater impact on energy input than joint angle.
- Larger loading areas correlate with higher crack fractal dimension, crack entropy, and penetration rate.
- Tensile cracks dominate initial damage, with shear cracks increasing post-peak.
Conclusions:
- Joint angle and loading area are critical factors influencing the mechanical behavior and failure modes of jointed rocks.
- Understanding energy evolution and crack patterns is crucial for predicting rock mass stability.
- Numerical simulations provide valuable insights for safe civil engineering design involving jointed rock masses.
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