Study on Surrounding Rock Structure Evolution Characteristics and Roof Control Techniques of the Retained Roadway Formed by Roof Cutting in Inclined Coal Seams

Figure 9

The sliding-type gangue-retaining structure formed by U-shaped steel inserts and its constitutive model. (in the figure, ε₆ and ε₇ refer to the sliding deformation and elastic deformation of the U-shaped steel inserts, respectively; σ₆ and σ₇ separately represent the friction between the two U-shaped steel members and the pressure applied thereon; and E₆ and σ denote the elastic modulus of the U-shaped steel inserts and the total pressure applied to the gangue-retaining structure formed by U-shaped steel members, with σ = σ₆ = σ₇.)