Study on Properties of Polyurethane Materials for Sealing Holes with Pressure Grouting
In order to solve the problems such as fast decay rate of gas extraction in coal seam extraction borehole of outburst mine,sealing hole leakage and so on,the technology of sealing hole with pressure is adopted.After test and comparison,polyurethane A and B materials with density of 164.5 kg/m3 are selected as sealing material with pressure.The comparison experiment verifies that the gas extraction concentration is increased to 34.2%～57.9%and the single hole extraction amount is 796.15～982.63 m3,and the gas extraction effect is obviously improved.
polyurethanesealing hole with pressure groutinggas extractioncompressive strength
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