Numerical simulation on the residual coal second mining of inclined medium-thickness coal seam;

The mining method with longwall,strike and back, and management methods after mining in steep medium-thick seam are introduced,including using hydraulic prop,using three kinds of protecting mthods,and keeping rock wall beforehand,which is applied in retaining roadvays along goaf after mining.

By analyzing the economic indicators and supports performance of ZH1800/2000/ 2800FA type suspended support in the useful process in the slope and middle thick coal seam,the applicable conditions of this kind of support,and the existing problems in use were analyzed.

Based on the application of artificial neural networks method, it sets up the artificial neural networks model for the evaluation on the degree of difficulty of top coal caving of roadway caving method in steep medium-thickness and high seam The model is made use of forecasting the technical-economic indexes of coal face and optimizing the technological parameters of roadway caving metho

Talking about the roof management at slope thick seam blast mining surface;

Frequent and violent underground pressure behavior and dynamic disaster made roadways deform and damage instantaneously in full-mechanized caving mining face with horizontal sections in steeply inclined and extremely thick coal seam.