In steep seem coal bed using hydraulic prop,and using reliable avoid lose prop interlocking rope is coal getting with oblique arch longwall mining on the strike.

Operational measures of false-inclined mining on 14923 blasting face;

The gravity retaining wall slanting backward proved to be the best after discussion on the types of retaining wall with some engineering examples.

Based on the condition of 3~# coal seam in Hetangou Coal Mine of Baotou mining bureaus, the effecting principle of dip mining and rise mining on rib fall in full-mechanized caving face has been studied, and to determine the advancing direction of the working face correctly is important for the rib-fall prevention has been pointed out.

Based on the technology problems during mining process,corresponding safety technical measure by studying its mechanism have been taken,and large inclined angle rise mining has been realized successfully.

,as the test object,the paper analyzed the pressure distribution law of the surrounding rock of mine inclined longwall face from the aspects of roof movement,stnesand and deformation of the roadway,periodic pressurization and others the results showed the up-dip mining and down-dip mining were significant different between abutment pressure distribution law,the .