Abstract：When using polyurethane for gas pressure measurement in an along-coal-seam hole,the first foaming time of polyurethane,the methods of injection and sealing are the key technologies that must be solved.In the site test of No.12 coalbed in Nanzhuang coal mine,the results indicated that when sealing length is more than35 m,the polyurethane ratio between black and white materials is 1∶1.25,and when using the method of injecting polyurethane into and between two blocks,the problem of measuring the pressure is resolved successfully,and the maximum measuring gas pressure is 19.57 percent smaller than the inversion calculation value.The research indicates that the alone-coal-seam hole-sealing using polyurethane is still the technical problems of more difficulty and smaller measured-value,but the results of the study still have a certain instructional significance to similar engineering applications.

Keyword：hole along coal seam;polyurethane;hole-sealing;rapid measurement technology;