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Dynamic Characteristics and Damage Constitutive Model of Mudstone under Impact Loading
Ruihe Zhou1, Hua Cheng1,2, Haibing Cai1
1School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China.
Materials (Basel, Switzerland)
|February 15, 2022
Summary
This study quantifies mudstone mechanical responses to dynamic loads, developing a validated model for roadway stability analysis. The research considers the rate effect on mudstone strength under impact.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Mining Engineering
Background:
- Coal mines face risks from dynamic loads impacting roadway stability.
- Understanding mudstone's mechanical behavior under impact is crucial for safety.
Purpose of the Study:
- To investigate the mechanical response of mudstone to single and cyclic impact loads.
- To establish a dynamic damage constitutive model for mudstone.
- To validate the model for roadway-surrounding rock stability analysis.
Main Methods:
- Split-Hopkinson pressure bar tests were used for single- and cyclic-impact compression.
- Dynamic stress-strain relationships and failure characteristics were analyzed.
- Statistical damage theory informed the constitutive model development.
Main Results:
- Mudstone peak stress and strain increased with impact pressure under single impacts.
- Under cyclic impacts, peak stress initially rose then fell, while peak strain consistently increased.
- The proposed dynamic damage constitutive model was validated against experimental data.
Conclusions:
- A validated dynamic damage constitutive model for mudstone was established.
- The model accurately predicts mudstone behavior under dynamic loads.
- This model aids in the stability analysis of roadways in coal mines.
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