In order to take out the core of outburst coal seams, and use the index of methane expansion energy initially released to forecast the fatalness of outburst, the paper analyzes the underground coring technology based on swivel type double tube core barrel.

In allusion to traditional single swiveling double-tube core barrel problems of relative poor inner and outer tube concentricity,damageable bearing,no feed slurry sand setting device,easy block up clearance between tubes,low coring efficiency,thus the DJ type single swiveling double-tube core barrel has developed.

The special designed water-sealing single action triple pipe coring tools and traditional pipe coring technology were adopted,and petroleum drilling technology and equipment,such as pressure grouting for blowout,were learnt to ensure the construction and experiment requirements of environmental scientific drilling.