Shallow Buried "Two Hard" Study Technology In Thick Seam Caving Hydraulic Support

Hydraulic support is one of the key equipment of modern coal mine fully efficient andsafe production, in the comprehensive mechanized coal caving mining in supporting the roof,the maintenance work space and goes on working surface coal mining machine and conveyorrole, however, China’s complex geological condition of coal seam, the hydraulic support inshallow buried depth, roof, hard coal seam "hard top coal caving mining under" conditions,due to technical limitations, the top coal caving and difficult recovery, caving and efficiency isnot high. The paper puts forward, to solve the shallow geological conditions of "two hard"thick top coal caving mining in high yield, high efficiency, high key recovery rate of coal, is ahydraulic supports, protects, top coal caving problems. ZF12000/23/40D support is acombination of Anjialing Coal Seam9#design of large mining height two pillar cavinghydraulic support, for this example, related research and analysis.This paper firstly introduces the working surface geological conditions and equipment,and application of mine pressure and control theory combined with mine shallow "two hard"characteristics "--Analysis of surrounding rock support" relationship, technical scheme of topcoal caving hydraulic support. Based on the type of ZF12000/23/40D support for themovement, the four connecting rod mechanism of stress analysis and parameter optimization,the caving hydraulic support with large support force in the hard top coal, repeated supportenough to make the hard top coal broken down, and the bulk coal crushing, caving fully,improve the recovery rate.Based on finite element analysis software ANSYS and the mesh, load and boundaryconditions on the bracket model, torsion, accurate simulation of support beam in beam beambending load, under different conditions, the complex structure should focus on the stressfield and stress, and the images were analyzed, providing scientific basis for the hydraulicsupport design in how to improve the structure strength and bearing capacity. Finally, through the fully mechanized top coal caving support overall matching diagram,hydraulic support renderings of the fully mechanized top coal caving three machine set,provides the reference for the research, but also provides a new thought and method for thetechnology and equipment of domestic coal enterprises.