## 6 Construction Method and Engineering Implementation Significance  
### Channel Structure Construction Method of Honeycomb Gas Flow Network  
The major technological means of gas control are boreholes and extraction. The effective extraction radius is a significant basis for the design of the extraction borehole, which directly influences the extraction effect. According to the theoretical analysis shown above, the permeability-increasing radius of the borehole's surrounding rock is directly  
Figure 12: Distribution of plastic zones in surrounding rocks of boreholes with different diameters. (a) Round (b) Oval (c) Butterfly. Figure 13: The permeability-increasing radius of borehole surrounding rock and borehole radius. connected to the confining pressure ratio, coal strength, and other parameters. When the plastic zone of the borehole's surrounding rock is round or oval, the impact of coal strength, gas pressure, and hole diameter on the perimeter is small. When the plastic zone of the borehole's surrounding rock is butterfly-shaped, the permeability-increasing circle is more sensitive to changes in coal strength, gas pressure, and hole diameter. The lower the coal strength or, the higher the gas pressure, the greater the sensitivity. Under the actual engineering geological conditions, the stress environment of coal seam surrounding rock, coal strength and gas pressure has existed objectively, which are not controllable human factors. As controllable factors, hole diameter and hole spacing usually expand the permeability-increasing range by increasing hole diameter and reducing hole spacing so as to realize gas flow and efficient extraction. Although increasing the hole diameter can raise the permeability-increasing radius of the surrounding rock and enhance the gas extraction rate to some extent, it also increases the building complexity, expense, and hazard. As a result, scientific and acceptable hole spacing has become the primary technical solution to increase the gas extraction rate. However, its layout is blind and lacks scientific theoretical direction. If the hole spacing is too big, it is simple to produce a blind extraction region. If the hole spacing is too narrow, the permeability-increasing range overlaps, resulting in excessive waste of human and material resources. Based on the foregoing considerations, a honeycomb gas flow network channel structure was established based on the distribution pattern of the borehole's surrounding rock. Additionally, the scientific and reasonable gas extraction hole spacing was determined by combining the coal seam stress environment and the mechanical properties of the coal body. The gas flow network channel structure conducive to gas extraction is created through the expansion and connection of the borehole's surrounding plastic rock zone. The connection of gas enrichment areas is realized. The flow of coal seam gas is promoted. The best gas extraction effect is achieved. The general idea of the Structure of a Honeycomb Gas Flow Network Channel (SHGFNC) is based on the distribution of plastic zone in the borehole surrounding rock, and the key to forming this structure is to determine the scientific and reasonable hole spacing. If the hole spacing is too small, the plastic zones of the surrounding rock of each borehole overlap with each other, which increases the cost of gas extraction. When the hole spacing is too large, the plastic zones of the surrounding rock of each borehole are independent of each other. It will form an independent channel structure of gas flow with a limited permeability-increasing range (as shown in Figure 14), which is obviously not conducive to the flow of gas between the surrounding rocks of the borehole. Scientific and reasonable gas drainage hole spacing should enable the plastic zone of each borehole surrounding rock to expand and form a honeycomb gas flow network channel structure, which promotes the flow of gas in the structure. It realizes the interoperability of  
Figure 14: Independent structure for gas flow channel.