The composition of the rock bolt

Several factors must be met to form an anchor bolt:

1.     A rod with higher tensile strength than rock and soil.

2.     One end of the rod can be in close contact with the rock and soil to form friction (or bonding) resistance.

3.     The other end of the rod outside the rock and soil can form a radial resistance to the rock and soil.

Principle of action: The anchor bolt is a tension member deep into the ground. One end is connected with the engineering structure, and the other end is deep into the ground. The whole anchor rod is divided into a free section and an anchor section. The free section refers to the area that transmits the tensile force at the bolt head to the anchor solid, and its function is to prestress the bolt. The anchorage section refers to the area where the cement paste bonds the prestressed tendons and the soil layer. Its function is to increase the bonding friction between the anchor solid and the soil layer, increase the pressure-bearing effect of the anchor solid, and transfer the tensile force of the free section. To the depths of the soil.

The role of anchor bolt: Anchor rod is a rod system structure for reinforcement of rock and soil. Through the longitudinal pulling force of the anchor rod body, the shortcoming of the rock and soil body's tensile capacity is far lower than the compressive capacity can be overcome. On the surface, it restricts the separation of the rock and soil from the original body. Macroscopically, it increases the cohesion of rock and soil. From a mechanical point of view, it mainly improves the cohesion C and the internal friction angle ? of the surrounding rock mass. In fact, the anchor rod is located in the rock and soil body to form a new complex with the rock and soil body. The anchor rod in this complex is the key to solving the low tensile capacity of the surrounding rock mass. So that the bearing capacity of the rock and soil body itself is greatly enhanced.

Rock bolt is the most basic component of roadway support in contemporary underground mining mines. It binds the surrounding rock of the roadway together so that the surrounding rock supports itself. Anchor bolts are not only used in mines, but also in engineering technology to actively strengthen slopes, tunnels, and dams.