Mechanical analysis and selection of hydraulic powered supports in fully mechanized coal caving face

In allusion to solving the dumping and down slide p roblems of the hydraulic supports in the 2313 full- mechanized coal face with large inclined angle in Geting mine, based on the geological and mining conditions, the strike and dip mechanical models of hydraulic support were est ablished and analyzed. The results show that, under condition of no-restriction on the top of support, Anti-toppl ing and anti-skid measures of hydraulic supports sh ould be taken in mining face with a dip angle more than 16 degree , furthermore, in 2313 face, the method of sliding advance of support should be done, and the minimal residual su pport force is 223kN in the process of advancing su pports. The main basis for selecting hydraulic supports and the key influence factors of the dumping and down slid e of supports were analyzed and compared, and the ZF4200/16/26 su pport was selected but it needs to be reformed. Aft er applying supports with three technology improvement s in 2313 face, the percentage of unstable supports reduces from 50% to 0%, the average height of roof caving r educed 75% and the depth of rib fall, 50%. So the sand high-efficiency exploitation is achieved in the lar ge inclined full-mechanized coal face with an avera ge coal inclined angle of 36 degree and the maximum incline d angle of 51 degree.