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Mechanical Behavior and Failure Modes of Cemented Backfill Under Impact Loading
Xiaohua Zhang1, Zhiyong Yang2,3, Xianglong Li1,4
1Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Materials (Basel, Switzerland)
|June 12, 2026
Summary
Cemented backfill (CTB) subjected to dynamic disturbances shows increased strength but also damage with higher impact loads. Reducing these loads is key to maintaining CTB stability and load-bearing capacity in mining.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Mining Engineering
Background:
- Cemented backfill (CTB) is vital for mine stability but vulnerable to dynamic disturbances from blasting.
- Understanding CTB's response to these disturbances is crucial for preventing catastrophic failures.
Purpose of the Study:
- To characterize the dynamic mechanical response and failure mechanisms of CTB under impact loading.
- To investigate the relationship between impact load, damage severity, and crack evolution in CTB.
Main Methods:
- Split Hopkinson pressure bar (SHPB) tests were used to assess dynamic mechanical properties.
- Scanning electron microscopy (SEM) examined microstructural features and hydration products.
- High-speed imaging captured crack propagation and evolution.
Main Results:
- Dynamic compressive strength (DCS) increased with impact load, but so did damage severity.
- Fractal dimensions of crack evolution ranged from 0.5 to 1.3, correlating with increased cracking and damage.
- Microstructure analysis revealed ettringite (AFt) and C-S-H gel as strength contributors, but microcracks limited inherent strength.
Conclusions:
- Higher dynamic loads increase CTB strength but also lead to greater damage and failure probability.
- Microstructural features like ettringite and C-S-H gel are critical for CTB cohesion.
- Mitigating dynamic loads during mining is recommended to enhance CTB stability and performance.
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