Application of high pressure hydraulic slotting in pressure relief and permeability enhancement of coal roadway. Issue 1 (June 2020)

• Record Type: Journal Article
• Authors: Li, Chengcheng
• Is Part Of: IOP conference series. Volume 526:Issue 1(2020)
• Publication Date: 2020-06
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/526/1/012159
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: In view of the coal seam without protective layer and the first coal seam with outburst risk, the method of high-pressure hydraulic slotting through layer drilling can be adopted to reduce the gas content in the strip of the coal roadway and realize the rapid driving of the coal roadway. Based on the practice of Xin-ji coal mine, the high pressure hydraulic slotting test is carried out. The results show that after adopting the high pressure hydraulic slotting measures, the radius of the slotting is 2.10 m, and the cumulative coal output is 3.25 ‰ of the raw coal in the coal lane. The permeability of coal seam is 25 times that in the uncut area, and the average single hole extraction volume is 3.21 times that in the uncut area. The effective radius of 30 days and 60 days after cutting is 2.3 times and 2.1 times of the original drilling. 49% of the drilling work quantity and 38% of the standard time of extraction are reduced. The driving speed of coal tunnel is 1.65 times that before adopting hydraulic cutting measures. Therefore, the high-pressure hydraulic slotting through the layer drilling can provide reference for the gas prevention and control work in the similar conditions of coal seam and the first coal seam with outburst risk.