Principle of action: The mechanical state of the surrounding rock itself is changed through the anchor rods inside the surrounding rock, and an integral and stable rock belt is formed around the tunnel. The anchor rods and the surrounding rock are used to interact simultaneously. To achieve the purpose of maintaining the stability of the roadway.

Anchor support is made of metal parts, wood parts, polymer parts or other materials, and is driven into pre-drilled holes in the surface rock mass or the rock mass around the chamber, and its head is used to , the special structure of the pole body and the tail support plate, or rely on the bonding effect to combine the surrounding rock and the stable rock mass to produce a suspension effect, a composite beam effect, and a reinforcing effect to achieve the purpose of support.

Extended information

1. Anchor support has the advantages of low cost, good support effect, easy operation, flexible use, and occupying less construction clearance.

2. The mechanical functions of anchors mainly include suspension, composite beam, composite arch, span reduction, and reinforcement.

The composite beam theory believes that there are several layered laminated roofs in the tunnel roof, which can be regarded as a beam with the two sides of the tunnel as the fulcrum. This rock beam supports the rock layer load on its upper part. Anchors are used to "bind" each layer into a whole composite beam to prevent rocks from sliding along the layers and avoid delamination of each rock layer.

Baidu Encyclopedia-Anchor Support