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Rock burst mechanisms induced by dynamic and static loading under composite key strata: a case study
Guowei Lyu1, Anye Cao2,3,4, Chengchun Xue1
1School of Mines, China University of Mining & Technology, Xuzhou, 221116, China.
Scientific Reports
|May 15, 2025
Summary
Composite strata in Chinese mines heighten rock burst risks. Synchronized strata movement and stress superposition trigger these events, but optimized control measures can mitigate hazards.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Rock Mechanics
Background:
- Composite effects between thick and weak sandstone strata in the Ordos mining area, China, elevate rock burst risks.
- Ensuring mine safety necessitates understanding rock burst mechanisms and developing effective prevention strategies.
Purpose of the Study:
- To analyze the formation conditions and rock burst mechanisms of composite key strata.
- To investigate the influence of strata thickness ratios and intercalation thickness on composite effects.
- To evaluate the effectiveness of optimized prevention and control schemes.
Main Methods:
- Theoretical analysis of composite key strata formation and rock burst mechanisms.
- Field monitoring of roof characteristics and dynamic responses in the 3- -1402 working face.
- Numerical simulations to assess the impact of thickness ratios and intercalation thickness.
Main Results:
- Composite key strata formation requires synchronous strata movement without shear slip.
- Increased static and dynamic loads, characterized by high peak stress and intense dynamic load release, were observed.
- The composite effect intensifies with closer upper/lower strata thickness and thinner intercalation.
Conclusions:
- Rock bursts under composite key strata effects result from the superposition of high static and strong dynamic loads.
- Optimized prevention and control schemes effectively mitigate rock burst risks in such conditions.
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