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Collaborative optimization of the Mathews stability graph method and numerical simulation for the limit exposure area
Chunlin You1, Jianhua Hu2, Jianing Li3
1Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, Fujian, China.
Scientific Reports
|July 21, 2025
Summary
This study enhances underground iron mine safety by evaluating stope stability using an extended Mathews stability graph and numerical simulations. Optimal exposure areas and reduced exposure times significantly improve stope stability and operational efficiency.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Rock Mechanics
Background:
- Hanging wall exposure in inclined iron ore stopes poses risks to mine safety and efficiency.
- Accurate stope stability assessment is crucial for underground mining operations.
Purpose of the Study:
- To evaluate stope stability in underground iron mines with inclined orebodies.
- To determine optimal stope dimensions and exposure times for improved safety and efficiency.
Main Methods:
- Utilized an extended Mathews stability graph method combined with numerical simulations (FLAC3D).
- Assessed rock mass quality using the Rock Mass Rating (RMR) system and Q' values.
- Determined stability probabilities by analyzing exposure time and mechanical responses.
Main Results:
- The expanded Mathews stability graph effectively determined stability probabilities for various exposure areas.
- Increased stope length improved stress distribution and reduced plastic destruction.
- Reduced exposure time and optimized exposure areas (e.g., 30m x 15m, 40m x 12.5m) enhanced stope stability.
Conclusions:
- The study provides practical guidelines for optimizing stope design and operational parameters.
- Findings contribute to enhancing the safety and efficiency of underground iron ore mining.
- Recommended maximum exposure times of 3 months with corresponding limit exposure areas improve stope stability.
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