Effect of gas-solid flow parameters and fracture structure parameter on particle deposition characteristics in the mining-induced fracture

The particle deposition in mining-induced fracture is an important reason for the sudden drop in gas drainage flow. In this study, particle deposition characteristics in fracture were investigated. The results showed that the particle deposition bed had prominent regional distribution characteristics along the axial direction of the fracture, and a humped distribution of the particle deposition height was observed along the radial direction of the fracture. In addition, the mechanism of the influence of the operating parameters of the gas-solid flow and the fracture shrinkage ratio factors on the particle deposition scale in the fracture differed fundamentally. The operating parameters of gas-solid flow mainly affected the deposition range of the transitional deposition bed. In contrast, the fracture shrinkage ratio mainly affected the deposition range of the local and transitional deposition beds. The results can provide guidance for understanding the particle deposition characteristics in fractures with a fracture shrinkage structure.