Study On The Optimization Design Technology Of Hydraulic Support In The Fully-mechanized Top Coal Caving Face With Heavy Dip Angle

The hydraulic support design technology of the fully-mechanized top coal caving face with heavy dip angle has making a slow progress because of the complexity of strata behaviors and rock fracture. There is less special literature in the main producing coal country abroad, the current research and using level of our country is in the lead level in the world. Analysis and research show that the key of the secure and efficient coal mining in the fully-mechanized top coal caving face with heavy dip angle is effective control measures for surrounding rock. But the stability of support and surrounding rock system is the difficulty for surrounding rock control. Hydraulic support is the key active factor of the surrounding rock control. The effect of the hydraulic support is a decisive function, so it is very important to optimize design techniques and methods of hydraulic support according to the interaction relationship between the hydraulic support and the surrounding rock.The dissertation studied the optimization design technology of hydraulic support in the fully-mechanized top coal caving face with heavy dip angle based on the interaction relationship between support and surrounding rock. The interaction relationship and mechanism between support and surrounding rock has been studied, the key factor is proposed - Determination of working resistance of support under different top coal conditions which influences the stability of hydraulic support. The analysis of the interaction relationship model between support and rock has been realized. The theory of relationship between support and surrounding rock was verified. The ZF5600/16.5/26 type hydraulic support in the fully-mechanized top coal caving face with heavy dip angle was designed, the different force conditions of hydraulic support has been summarized. The model finite element analysis was realized by using the software ANSYS. The structural reliability of support was verified. The optimum design methods of hydraulic support was discussed under the different load condition. The anti-slipping and anti-falling stability of the hydraulic support in the heavy dip angle caving face has been studied. The analysis of anti-slipping and anti-falling stability model has been realized. So the support structure design meets the need of actual requirements for controlling the rock effectively. The optimization design technology of hydraulic support in the fully-mechanized top coal caving face with heavy dip angle under complicated conditions has been put forward. The design theory and methods of hydraulic support in the fully-mechanized top coal caving face with heavy dip angle were enriched and developed through the study. The dissertation provided the theory and method reference for the optimum design of hydraulic support.