Studying of dynamic bear characteristics and adaptability of support in top coal caving with great mining height

Based on theoretical analysis and spot hydraulic support resistance observation, the idynamic bear characteristics and adaptability of ZF15000/28/52 hydraulic support in fully-mechanized top coal caving with great mining height has been studied. The results shows that: with high impact resistant capability, the ZF15000/28/52 hydraulic support is influenced slightly by face pressure; with high stability and reliability, the safety valve of the ZF15000/28/52 hydraulic support can be capable of opening timely when resistance exceeds Rated resistance; with high high-usage, the support runs reasonably and have a good adaptability to the roof. The resistance of the hydraulic support presents as sine distribution The distribution of setting load presents as a linear type of P = A + BX. The pillar with balanced force has a good condition.