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Mechanical characteristics and energy evolution in a rock mass with a weak structural plane
Yongjiang Yu1, Yuntao Yang2, Jingjing Liu1
1College of Mining Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
Scientific Reports
|November 1, 2023
Summary
This study reveals how weak structural planes in rock masses affect mechanical properties and energy changes during triaxial compression. Higher dip angles reduce the risk of sudden rock mass failure, offering insights into geological disaster analysis.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Materials Science
Background:
- Understanding rock mass behavior under stress is crucial for geotechnical engineering.
- Weak structural planes significantly influence the mechanical characteristics of rock masses.
- Energy evolution during rock deformation provides insights into failure mechanisms.
Purpose of the Study:
- To investigate the mechanical properties and energy evolution of rock masses with weak structural planes under triaxial loading.
- To analyze the slip-stability phenomenon and its underlying mechanisms.
- To propose and validate the concept of 'slip dissipation energy'.
Main Methods:
- Conventional triaxial compression tests were conducted on coal rock masses using a fluid-solid coupling system.
- Tests were performed at various structural plane dip angles.
- Analysis of deviatoric stress-strain curves and energy evolution during deformation and failure.
Main Results:
- Deviatoric stress-strain curves show step-wise increases for dip angles > 20°, indicating slip-stability.
- Energy evolution during failure reflects the rock's damaged state, with four distinct stages identified.
- A negative correlation exists between structural plane dip angle and instantaneous impact instability failure.
Conclusions:
- Energy evolution is dominated by energy storage and dissipation, regardless of dip angle at peak stress.
- The concept of 'slip dissipation energy' effectively correlates with observed mechanical behavior.
- Increased dip angles enhance rock mass stability, reducing susceptibility to sudden failure and aiding in geological disaster analysis.
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