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Experimental study on compression mechanical characteristics of filled rock joints after multiple pre-impacts
Shaobo Chai1,2,3, Yongsheng Jia4,5, Yuxiang Du6,7
1State Key Laboratory of Precision Blasting of Jianghan University, Wuhan, 430056, China. shbchai@chd.edu.cn.
Scientific Reports
|August 10, 2022
Summary
Multiple impacts increase damage in artificial jointed rock, affecting static and dynamic strength differently. Failure modes simplify to compression failure with increased impact events.
Area of Science:
- Rock mechanics
- Materials science
Background:
- Understanding the mechanical behavior of jointed rock is crucial for geotechnical engineering.
- Cumulative damage from repeated impacts can significantly alter rock properties.
Purpose of the Study:
- To investigate the static and dynamic mechanical properties of artificial jointed rock specimens subjected to multiple impacts.
- To analyze the influence of damage degree on compressive strength and failure modes.
Main Methods:
- Artificial jointed rock specimens were subjected to repeated impacts using a drop hammer device.
- Static compression tests were performed using a universal testing machine.
- Dynamic compression tests were conducted using a Split-Hopkinson Pressure Bar (SHPB) device.
- High-speed photography captured the impact failure process.
Main Results:
- Nonlinear increase in damage degree with increasing impact times.
- Distinct attenuation laws for static and dynamic strength under similar damage evolution.
- Wave velocity correlates with the damage degree of jointed rock specimens.
- Failure mode shifts towards compression failure with cumulative damage.
Conclusions:
- Multiple impacts lead to progressive, nonlinear damage in jointed rock.
- Static and dynamic strength degradation patterns differ.
- Damage significantly influences the compressive strength and failure characteristics of filled joints.
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