冲击地压的两种破坏类型及其机制OA北大核心CSTPCD

Clarifying the mechanism of coal bump is a necessary content for effective prevention and control of coal bump.The paper summarizes the apparent characteristics of multiple implementations of coal bump and proposes a new classification of coal bump based on this.In response to the new classification,their occurrence mechanisms were proposed.Research has shown that there are two different types of occurrences,which are defined as coal-crushing bump and coal-sliding bump.The former is characterized by coal crushing,while the latter is mainly characterized by the sliding of coal into the roadway in its entirety.Two types of coal bump mechanisms were proposed for two types of coal bump occurrence.The mechanism of coal-crushing bump is that the coal mass is crushed under quasi dynamic loading because the surrounding rock undergoes elastic rebound after the coal mass fractures under high stress,which is the fracturing-bursting mechanism.The mechanism of coal-sliding bump is that the upward bending of the roof leads to a decrease in the vertical pressure of the coal seam.The coal loses its grip overcomes the friction between the roof and floor,as well as the tensile resistance of the coal,and then sliding into the roadway as a whole under the action of horizontal stress,which is the unloading-sliding mechanism.