The Development and Performance Validation of a Real-Time Stress Extraction Device for Deep Mining-Induced Stress.

Area of Science:

• Geotechnical Engineering
• Mining Engineering
• Rock Mechanics

Background:

• Deep mining faces high in situ stress and disturbances, impacting rock mass stability and mine safety.
• Accurate, real-time monitoring of in situ stress is crucial for deep underground engineering.
• Conventional stress monitoring methods are limited under high-stress and strong-disturbance conditions.

Purpose of the Study:

• To develop and validate a novel in situ stress monitoring device for deep mining conditions.
• To evaluate the device's performance under various stress paths and rock degradation levels.
• To provide a practical solution for surrounding rock stability analysis and disaster prevention.

Main Methods:

• Development of a novel in situ stress monitoring device.
• Laboratory experiments simulating deep surrounding rock conditions (unloading-reloading, biaxial unequal stress).
• Testing on intact and pre-damaged rock specimens (30%, 50%, 70% damage).
• Performance evaluation using strain signal acquisition and acoustic emission analysis.

Main Results:

• The device stably acquired strain signals throughout loading-unloading cycles.
• Inverted stress monitoring showed high consistency with loading (peak stress errors < 5%, R² > 0.95).
• Monitoring remained stable despite increased fluctuations with higher initial rock damage.
• Acoustic emission data corroborated the reliability of the stress monitoring results.

Conclusions:

• The developed device enables accurate and dynamic in situ stress monitoring in deep mining.
• It provides a practical technical approach for assessing surrounding rock stability.
• The findings contribute to enhanced mine safety and disaster prevention strategies.