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Progressive damage mechanism of rock-anchoring interface under cyclic impact loading.
Peng Wang1,2,3, Nong Zhang1,2,4, Jiaguang Kan5,6
1School of Mines, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China.
Scientific Reports
|August 5, 2025
Summary
Cyclic impacts degrade rock-anchoring interfaces, weakening deep roadway supports. Material strength and ductility are crucial for selecting robust anchoring systems to ensure stability under repeated stress.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Rock Mechanics
Background:
- Cyclic impacts cause fatigue damage at rock-anchoring interfaces, threatening deep roadway support stability.
- Understanding macro- and micro-scale damage evolution is vital for improving support system resilience.
Purpose of the Study:
- To investigate rock-anchoring interface damage mechanisms under cyclic impacts.
- To analyze the influence of rock type, anchorage angle, and impact air pressure on damage evolution.
Main Methods:
- Split Hopkinson pressure bar (SHPB) for dynamic mechanical testing.
- Low-field nuclear magnetic resonance (LF-NMR) for micro-scale pore structure analysis.
Main Results:
- Increasing impact air pressure enhances dynamic compressive strength and strain rate.
- Cyclic impacts progressively reduce dynamic compressive strength while increasing strain.
- Pore volume and large-pore proportion increase with accumulated impacts, indicating internal damage expansion.
Conclusions:
- Failure progresses through fissure compression, initiation, propagation, penetration, and rupture, influenced by rock properties and impact conditions.
- Material strength-deformation incompatibility drives failure modes like crushing, splitting, and debonding.
- Selecting anchoring materials with balanced strength and ductility is essential for cooperative load-bearing and enhanced stability.
Keywords:
Cyclic impactFracturing behaviorMechanical propertiesProgressive failureRock-anchoring interfaceMore Related Videos
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