According to the fieldwork experimentation,after adopting the high-pressure water injection technology,the width of the stress-relaxed zone at the front of the working face increases form 2.

Width of destressing gas zone in coal ribs:theoretical analysis and its application

Combining the maintenance principle of pressure relief and support,the principle of pressure–relief support is interpreted with the consideration of wall rock creeping and pressure relief.

Based on theories of the elasticity, rock mechanics, damage mechanics, seepage mechanics and ect, using theory analysis, similar simulation test, numerical Simulation, field application, the paper studies on pressure relief characteristic, move deformation, fracture developmentand seep characteristic of underlying coal-roc.

In certain altitude range, pressure relief effect happens on the coal-rock masses in the“three zones”, which makes a good and active effect to the gas control of outburst coal seams.

Application of well washing technology without pressure release in high pressure water injection well;

Taking tashan Mine as a example,according to the analysis based on the Characteristics of the Cracks in Stopes,experimental research of stress-relieve gas drainage is worried about.