Study On Comprehensive Mechanized Coal Mining Technology Under Complex Geological Conditions With Large Dip Angle

China's large dip coal seam accounts for about 15% to 20% of the total coal total in China.In order to ensure high productivity and efficiency of the mine,many mining areas increase the intensity of coal mining,which leads to a lot of coal mines turning to complicated and difficult coal seams from good coal seam.It is of great significance to study the mechanized and high-efficiency mining technology for coal seam with large dip angle under complicated conditions.In this paper,combined with the specific geological survey of the 5877 Y working face in Lujia Tuo mine,the occurrence of coal seam and the roof and floor condition,the FLAC3 D finite difference software is used to establish the model,and the numerical simulation is carried out to analyze the law of the ore pressure in the big dip angle working face,and the technical difficulties and solutions of the big dip angle working face are studied and the calculation is made through theoretical analysis and calculation.The width of coal pillar is protected,and the technical problems that are difficult to be solved are solved through the study of the comprehensive mechanized coal mining in the large inclined coal seam in Lujia Tuo coal mine.It not only promotes safety but also promotes the coordinated development of energy and economy.Figure 22;Table 17;Reference 42...