Method of determining rational width of small coal pillar protecting roadways driving along next goaf supported by bolting and meshing of fully mechanized sub-level face;

Using digital simulation,the mining-induced stress distribution in the entry with large mining height and second weight is analyzed,a optimum support scheme is choosed by perpendicular design.

1 colliery 201 face entry in Huangling,giving appropriate measures.

Shoring technology of the Ahead of time to the sides hydrolic shield in the roadway;

This paper,through theoretical calculation,optimized the shape and size of the roadway cross-section in case of stable roof and soft ribs.

, selects the supporting forms of the monoblock plus лtype beams that is the most suitable to he double crossheading support on comprehensive mechanized mining faces and obtains the better results.

The application of the combined support with cable and anchor in the face crossheading is introduced.

Aiming at the feature of spontaneous combustion in the construction process of starting cut along gob area of fully mechanized coal face,the author puts forward the reasonable layout of starting cut and special fire-fighting technology through profound study and better results are achieved,providing an example for the similar working faces in safe production and fire-fighting processes.