Abstract: With laboratory tests and particle flow simulation, stress distribution evolution law and influencing factors along anchorage segment are studied. The failure process of anchor system can be divided into three stages: viscoelastic stage, de-viscosity stage and failure stage. In the viscoelastic stage, the shear stress first increases and then decreases along the anchorage segment, and the peak point is close to the pull end. In the de-viscosity stage, the bond at the pull end first fails, and then expands to the internal layer. The shear stress peak point also moves inward. Elastic modulus of anchor and anchor agent influences the stress distribution. With the increase of anchor’s modulus and decrease of anchor agent’s modulus, the intensity of stress at pull end weakens.

Key words: stress distribution, pull test, particle flow simulation, elastic modulus