Structural Charaeteristics and Adaptability of Four-leg Caving Top Coal Hydraulic Supports

According to state change characteristics of the interaction between the supports and surrounding rock, taking ZF10000/23/35 four-leg caving top coal hydraulic support as an example, by comparing the limit state of the support test with the actual limit state in the well, the reasons of abnormal working conditions in the use of four-leg caving top coal support are analyzed, and the effective measures to improve the imbalance of the support state are studied.