Short-term HeI 10830 Activity in Arcturus;

Study on stability technology of hydraulic support in fully-mechanized caving working face with large dip angle;

Vertical dip mining system for fully mechanized face under the condition of large dip angle (24°);

Aiming at the complex geologic condition in deep angle inclined top-coal wall,analyzed the reciprocity relationship of fully mechanized top-coal hydraulic support stress state and enclosing rocks under the condition of large dip angle,expatiated the effect on the capability of hydraulic powered support that the enclosing wall characteristic arousing.

23123 working face as an example,the problem in the coal mining of large-angle underhand stoping is analyzed.

Applying this method, the error of tooth profile of gear shaping cutter was reduced, and this method was successfully applied in designing of gear shaping cutter with 9°big back angle.

Having taken high inclined angle 31502 working face fully mechanized top coal caving in Zhang Ji Mine of Kangbao Mining Company as object of study,this paper analyzes the complicated situation the 31502 fully mechanized top coal caving face will face,having taken specific measures and management methods to guarantee mining safely,providing methods for future mining and accumulating experience.

Through the research and analysis on 8256 light carving face support gliding caused by complicated geological structure,deep mining,and high inclined angle in Yangquhe Coal Mine,this paper provides a solution to the gliding of light caving support and ancillary equipment,improving the recovery rate of coal,providing a reference for future mining under similar conditions.

In view of the actual situation,through the transformation of the mechanical and electrical equipment,the adjustment of extraction technology and strengthening the management of safety production,we are successful in the elevated fully mechanized coal face high inclined angle .