1, In a layered rock formation, the anchor suspends the lower unstable rock layer on the upper stable rock formation. The tension applied to the anchor comes from the suspended rock formation.

2, In a thin rock formation without a stable rock formation, the clamping force of the anchor will increase the friction between the layers after the anchor is installed, this friction prevents the rock continuing to slide along the level, thereby locking several thin layers of rock through the anchor into a thicker rock formation. The maximun bending stress and strain in such thick rock beams are inversely proportional to the square of the thickness of the beam, the thicker the integrated rock beam, the smaller the maximum bending stress and strain. At the same time, the strength of the bolt itself also increases the overall shear capacity of the beam.

3, Anchor arch combination principle, when a prestressed anchor is installed in the rupture zone of the surrounding rock of the shaped roadway, the compressive stress distributed in the form of a circular vertebral body will be formed at both ends of the rod body, if the anchor group is arranged along the top plate, the compressive stress circular vertebral bodies formed by each anchor will be staggered, formed a pressure-bearing arch that prevents the rupture zone from spreading, which is capable of withstanding the radial load exerted by the upper broken rock. The pre-tightening force along the axial direction of the anchor rod produces a hoop stress in the combined arch, which significantly improves the stress state of the bearing arch, and changes the state of the surrounding rock from uniaxial to biaxial to triaxial compression. In this way, a uniformly compressed continuous bearing zone is formed in the surrounding rock, thereby greatly increasing the bearing capacity of the combined arch.

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