Analysis of Influence of Ultra-High Pressure Water Jet Cutting Pressure Sequence on Pressure Relief and Reflection Improvement of Coal Seam

In order to explore the pressure relief effect of two combined and antireflection technologies ultra-high water jet cutting before cutting, theoretical analysis, numerical simulation, field test were used study main control factors high-pressure slit fracturing technology. This paper introduces technology hydraulic fracturing, analyses mechanism transparency enhancement combination after cutting. The results show that starting coal seam with is 13 MPa, influence radius 45–55 m, 16 35–45 m. Compared permeability technology, can improve seams more evenly effectively, reduce stress near hole. make body uniform sufficient, overall coefficient greatly improved. drilling purity 2.3 times extraction ordinary single hole drilling, range increased, significantly At same time, reduced slitting, reduced. research provide a scientific basis for under similar conditions in mining area have broad application prospect.