Rock pressure evaluation in coal face based on multi-factor decision-making theory.

Area of Science:

• Mining Engineering
• Geotechnical Engineering
• Rock Mechanics

Background:

• Rock pressure behavior during coal mining causes significant annual casualties and equipment damage.
• Accurate prediction of rock pressure strength in coal faces is essential for accident prevention.

Purpose of the Study:

• To propose and validate a novel "dual-dimension rock pressure strength evaluation method" for coal faces.
• To enhance the prediction accuracy of rock pressure strength and mitigate mining-related accidents.

Main Methods:

• Applied the law of sedimentary pressure control and microseismic monitoring data to derive an initial rock pressure strength index (I).
• Utilized Euclidean distance formula at the coal face scale, incorporating rock pressure control mechanisms, to obtain a second rock pressure strength index (I).
• Employed a rock pressure strength grade matrix for mutual correction of the two indices, determining the final coal face rock pressure strength grade.

Main Results:

• The dual-dimension evaluation method demonstrated accurate predictions when applied to a coal face.
• The predicted outcomes closely aligned with the actual observed conditions in the coal face.

Conclusions:

• The proposed dual-dimension rock pressure strength evaluation method offers a reliable theoretical reference for predicting rock pressure strength.
• This method can significantly contribute to the prevention of rock pressure accidents in mining operations.