Mechanical behaviors of pressure-dispersive prestressed anchor

Through the mechanical analysis of the anchorage segment of the pressure-dispersive prestressed anchor, the analytic solutions for the distribution of the shear stress and the axial force in the anchor are derived. Based on the developed analytical solutions, the stressed properties of the pressure-dispersive prestressed anchor and the pressure-concentrative prestressed anchor are compared. The results show that the shear stress and axial force of the pressure-dispersive prestressed anchor greatly decrease, and the phenomenon of stress-concentration is avoided. The influences of the mechanical characteristics of the rock mass and the prestress on the shear stress and axial force are discussed. It is shown that the greater the elastic modulus and internal friction angle of rock mass, the greater the maximum of shear stress and the faster the decrease of axial force; the greater the prestress, the greater the shear stress and axial force; and the greater the cohesion, the greater the shear stress and the smaller the axial force, but there is little effect.