Research on Gas Control Technology of “U+ Omni-Directional Roof to Large-Diameter High-Level Drilling Hole” at the End Mining Face of Multi-Source Goaf
Abstract
:1. Introduction
2. Project Overview
3. Field Detection of Fissure’s Developing Height
3.1. Time Selection and Principle Analysis of Probe Hole
3.2. Processing and Analysis of Detection Images
4. Numerical Simulation of Fissure’s Developing Height in Mining Overburden
4.1. Numerical Calculation Model and Boundary Conditions
4.1.1. Model Establishment
4.1.2. Model Boundary and Load Conditions
- The boundaries of the four sides of the model are fixed; that is, the horizontal displacement is zero, and horizontal stress is applied.
- The bottom boundary of the model is fixed; that is, the horizontal displacement and vertical displacement are both zero.
- The top of the model is a free boundary, and vertical stress is applied. The load conditions of the model were determined: the #15 coal seam is about 370 m away from the surface, and the upper boundary of the model is used as the equivalent stress by applying the gravity of the overlying strata. In the model, the #15 coal seam is 100 m away from the upper part of the model, and the upper boundary of the model is about 270 m away from the surface.
4.2. Numerical Simulation Scheme
- The stress distribution characteristics of the surrounding rock in the goaf;
- The distribution characteristics of the plastic zone of the surrounding rock in the goaf.
4.3. Analysis of Numerical Simulation Results
- 3.
- The stress distribution characteristics of the surrounding rock in the goaf with different advances of the working face. The distribution of the stress field in the stope is also continuously changing, while the stope goes through the process from the first weighting to periodic weighting. Figure 9 shows the vertical principal stress profiles of the central part of the goaf with different advance distances.
- 4.
- The distribution characteristics of the plastic zone of the surrounding rock in the goaf with different advance distances. Figure 10 shows the distribution nephogram of the plastic zone of the surrounding rock in the goaf with different advance distances.
5. Reasonable Arrangement of Parameters of Omni-directional Roof High-Level Boreholes
6. Analysis of Gas Drainage Effect of High-Level Boreholes in the Final Mining Face and the Influence of Air Distribution Volume on High-Level Boreholes
- Analysis of the effect of gas drainage from head-on high-level boreholes
- 2.
- Analysis of gas drainage effect of reverse high-level boreholes
- 3.
- Site Management of High-Level Drilling Field
- 4.
- Influence of Air Distribution Volume on High-level Boreholes
7. Conclusions
- Through on-site detection and numerical simulation, it is concluded that the caving zone of the #15 coal seam has a maximum height of 14.87 m, and the maximum height of the fissure zone is 59.29 m, which provides a basis for the selection of the high-level borehole position in the working face.
- According to the calculation results of the heights of the fissure zone and caving zone of the coal seam roof, the gas control scheme of the “U+ omni-directional large-diameter high-level borehole along roof strike” in the final mining face was formulated. After adopting this scheme, the drainage concentration of each borehole will reach 5–20%, with a gas drainage flow rate of 1 mm3/min–2.5 m3/min, and the average gas drainage volume will reach 0.15 m3/min. The maximum gas concentration in the upper corner is 0.54%, and the maximum gas concentration in the return airway is 0.35%, which achieved the expected gas control effect.
- The reasonable air distribution volume of the 1307 stope face should be less than 2580 m3/min. When the amount of gas gushing out from the working face is large, the air distribution volume of the return airway can be appropriately increased within the wind speed limit, combined with high-level boreholes for gas drainage, which can effectively prevent gas over-run in the upper corner.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Hole Number | Hole Depth (m) | Angle with Roadway (°) | Angle of Inclination (°) |
---|---|---|---|
1 | 55 | 4 | 35 |
5 | 65 | 11 | 45 |
Hole Number | Depth of Borehole Fracture Location (m) | Angle of Inclination (°) | Height of Fracture (m) | Notes |
---|---|---|---|---|
1 | 14.37 | 35 | 8.24 | Before mining |
1 | 21.37 | 35 | 12.25 | Before mining |
1 | 19.66 | 35 | 11.27 | Before mining |
1 | 22.68 | 35 | 13.00 | Before mining |
5 | 14.86 | 45 | 10.50 | Before mining |
5 | 18.35 | 45 | 12.97 | Before mining |
5 | 19.08 | 45 | 13.49 | Before mining |
5 | 15.83 | 45 | 11.19 | Before mining |
1 | 34.58 | 35 | 19.83 | After mining |
1 | 36.43 | 35 | 20.89 | After mining |
1 | 39.55 | 35 | 22.67 | After mining |
1 | 46.43 | 35 | 26.62 | After mining |
5 | 35.54 | 45 | 25.12 | After mining |
5 | 28.95 | 45 | 20.46 | After mining |
5 | 27.15 | 45 | 19.19 | After mining |
5 | 38.85 | 45 | 27.46 | After mining |
Serial Number | Rock Character | Density (Kg/m3) | Elastic Modulus (GPa) | Cohesion (MPa) | Tensile Strength (MPa) | Internal Friction angle (°) | Poisson’s Ratio |
---|---|---|---|---|---|---|---|
1 | Coal | 1400 | 2.7 | 1.6 | 0.8 | 28 | 0.35 |
2 | Fine-grained sandstone | 2626 | 9.9 | 2.6 | 3.0 | 43.6 | 0.23 |
3 | Medium-grained sandstone | 2644 | 6.5 | 2.4 | 2.7 | 42.3 | 0.24 |
4 | Sandy mudstone | 2649 | 5.4 | 2.1 | 0.1 | 38.8 | 0.11 |
5 | Lime rock | 2625 | 52.5 | 2.8 | 6.0 | 77.5 | 0.21 |
6 | Alumina mudstone | 2646 | 6.0 | 2.3 | 1.4 | 40.6 | 0.18 |
Hole No. | Hole Depth (m) | Angle with XXV 1212 Lane (°) | Elevation Angle (°) | Height Difference between Terminal Hole and Roof (m) | Hole No. | Hole Depth (m) | Angle with XXV 1212 Lane (°) | Elevation Angle (°) | Height Difference between Terminal Hole and Roof of Drilling Site (m) |
---|---|---|---|---|---|---|---|---|---|
1 | 156.5 | 7.8 | 0.3 | 15.5 | 15 | 48.3 | 81 | 6.5 | 13.5 |
2 | 157.2 | 9.5 | 0.2 | 16 | 16 | 55.1 | 59.8 | 7.8 | 14 |
3 | 158 | 11.1 | 0.4 | 16.5 | 17 | 67.4 | 45.3 | 8.7 | 14.5 |
4 | 159 | 12.8 | 0.3 | 17 | 18 | 82.5 | 35.3 | 8.3 | 15 |
5 | 160.1 | 14.4 | 0.6 | 17.5 | 19 | 99.4 | 28.8 | 8.6 | 15.5 |
6 | 161 | 16 | 0.4 | 18 | 20 | 117.1 | 24.1 | 8.3 | 16 |
7 | 162.7 | 17.6 | 0.7 | 18.5 | 21 | 135.6 | 21.2 | 8.4 | 16.5 |
8 | 138.9 | 20.7 | 0.4 | 18.5 | 22 | 154.6 | 18.5 | 8.1 | 16.5 |
9 | 120.2 | 23.8 | 0.5 | 18 | 23 | 153.2 | 16.9 | 8.2 | 16 |
10 | 102.1 | 28.3 | 0.4 | 17.5 | 24 | 151.8 | 15.1 | 8 | 15.5 |
11 | 85.5 | 33.7 | 1.2 | 17 | 25 | 150.7 | 13.5 | 8.1 | 15 |
12 | 70 | 42.8 | 1.8 | 16.5 | 26 | 149.6 | 11.6 | 7.9 | 14.5 |
13 | 57.1 | 56.1 | 2.1 | 14 | 27 | 148.7 | 10 | 8.1 | 14 |
14 | 49 | 76 | 3.6 | 13.5 | 28 | 147.9 | 8.1 | 7.8 | 13.5 |
Daily Output (t) | Working Face Emission Quantity (m3/min) | Working Face Air Distribution (m3/min) | Maximum Gas Discharge in Strong Wind (m3/min) | Extraction Quantity (m3/min) |
---|---|---|---|---|
2500 | 7.1 | 719 | 3.2 | 3.9 |
3000 | 8.44 | 818 | 3.64 | 4.8 |
3500 | 10.27 | 916 | 4.07 | 6.2 |
3769 | 11.48 | 1008 | 4.48 | 7 |
4000 | 11.91 | 1015 | 4.51 | 7.4 |
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Gao, H.; Lei, Y. Research on Gas Control Technology of “U+ Omni-Directional Roof to Large-Diameter High-Level Drilling Hole” at the End Mining Face of Multi-Source Goaf. Processes 2023, 11, 320. https://doi.org/10.3390/pr11020320
Gao H, Lei Y. Research on Gas Control Technology of “U+ Omni-Directional Roof to Large-Diameter High-Level Drilling Hole” at the End Mining Face of Multi-Source Goaf. Processes. 2023; 11(2):320. https://doi.org/10.3390/pr11020320
Chicago/Turabian StyleGao, Hong, and Yun Lei. 2023. "Research on Gas Control Technology of “U+ Omni-Directional Roof to Large-Diameter High-Level Drilling Hole” at the End Mining Face of Multi-Source Goaf" Processes 11, no. 2: 320. https://doi.org/10.3390/pr11020320
APA StyleGao, H., & Lei, Y. (2023). Research on Gas Control Technology of “U+ Omni-Directional Roof to Large-Diameter High-Level Drilling Hole” at the End Mining Face of Multi-Source Goaf. Processes, 11(2), 320. https://doi.org/10.3390/pr11020320