Study on the Application of Comprehensive Gas Control Technology for Source-Separated Three-Dimensional Gas...

Area of Science:

• Mining Engineering
• Geotechnical Engineering
• Environmental Science

Background:

• Large mining faces face significant challenges with high gas outbursts from adjacent layers and coal seams.
• Understanding strata instability and gas outburst characteristics is crucial for effective gas management.

Purpose of the Study:

• To develop and validate a comprehensive, source-separated three-dimensional gas extraction system and management model for large mining faces.
• To provide guidance for optimizing gas extraction strategies in complex geological conditions.

Main Methods:

• Established a source-separated three-dimensional gas extraction system based on strata failure and gas outburst characteristics.
• Developed a comprehensive gas management model for large mining faces.
• Utilized FLAC3D numerical simulations to analyze overlying strata and floor fracture zones.
• Optimized roadway layouts (high-level, inclined, low-level, floor drainage) and gas extraction techniques (ordinary and large-diameter boreholes).

Main Results:

• Achieved 87.5% methane capture efficiency on the 15115 mining face.
• Maintained methane concentrations below 0.8% in the upper corner and return airflow.
• Increased methane concentration from coal seam boreholes by 2.9 times compared to ordinary mining faces.
• Provided geological data guiding roadway and drainage system design.

Conclusions:

• The proposed gas management model effectively mitigates gas-related hazards in large mining faces.
• The integrated approach significantly improves methane extraction rates and operational safety.
• This method enables harmonious coal and methane extraction, promoting sustainable mining practices.