Related Experiment Video
Updated: Jul 15, 2025
10:27
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
Published on: June 12, 2019
8.7K
Comprehensive Gas Prevention and Control Technique for Mining the First Seam in Short-Distance Outburst Coal Seam
Yong Chen1,2,3, Ronghua Liu1, Yichao Li4
1School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China.
ACS Omega
|October 2, 2023
Summary
This study addresses coal and gas outbursts in the Diandong mining area by developing advanced detection and pre-extraction technologies for ultraclose coal seams. These methods improve safety and gas extraction efficiency in challenging mining conditions.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Earth Sciences
Background:
- Coal and gas outbursts pose significant risks in mining, particularly in close-range seam groups with high gas content and pressure.
- The Diandong mining area presents unique challenges due to its ultraclose coal seams (up to 20 m³/t gas content, 3 MPa pressure).
- Existing methods struggle with effective detection, prevention, and gas extraction in such complex geological formations.
Purpose of the Study:
- To develop advanced detection and pre-extraction technologies for ultraclose coal seam groups.
- To enhance gas extraction quality and efficiency in low-permeability coal seams.
- To establish methods for joint extraction and safety in high-risk outburst zones.
Main Methods:
- Constructed advanced detection technology for full coverage in front of excavation working faces.
- Developed pre-extraction technology for adjacent and target coal seams in ultraclose layers.
- Implemented cross-layer fixed-point hole expansion and permeability enhancement techniques.
- Proposed a combined process of graded enhanced pre-extraction and segmented regulation and extraction, including "fixed-point control section sealing pre-extraction of coal seam groups and secondary sealing and extraction of mining pressure relief orifice."
Main Results:
- Achieved full coverage advanced detection in excavation faces.
- Successfully implemented pre-extraction for ultraclose adjacent and target coal seams.
- Developed and applied a method for cross-layer fixed-point hole expansion and permeability enhancement.
- Validated a novel combined process for graded enhanced pre-extraction and segmented regulation and extraction.
Conclusions:
- The developed technologies provide effective solutions for detecting and preventing coal and gas outbursts in ultraclose seam groups.
- The new methods significantly improve gas extraction quality and efficiency, enhancing mining safety.
- This research offers a practical framework for managing risks associated with joint extraction in high-pressure, high-gas environments.
Related Concept Videos
01:15Quarrying of Stone
134
Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
134
01:22Cardiopulmonary Resuscitation II: ACLS Airway Management
17
Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned...
17
01:28Survey Safety
43
Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
43
01:23Insulation Coordination
167
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
167
01:25Atomic Absorption Spectroscopy: Atomization Methods
559
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
559
01:18Shotcrete
82
Shotcrete is a specialized technique where mortar or small aggregate concrete rich in cement content is sprayed onto a surface at high velocity. The force of impact compacts the material and enables it to cling to vertical or overhead areas without sagging. The technique involves layering the shotcrete in stages until it reaches approximately 4 inches in thickness. Operator skill in nozzle management is pivotal in deciding the quality of the shotcrete. Shotcrete is used in constructing tunnel...
82