As a tensile member deep into the stratum, one end of the left-handed rock bolt is connected to the engineering structure, and the other end is deep into the stratum. The entire anchor is divided into a free section and an anchor section. The free section refers to the area where the tensile force at the head of the bolt is transmitted to the anchor solid, and its function is to apply prestress to the anchor; the anchor section refers to the area where the cement paste bonds the prestressed tendons to the soil layer, and its function is increase the bonding friction between the anchor and the soil layer, increase the anchor's pressure-bearing effect, and transmit the tension of the free section to the depth of the soil.

The necessary factors to form a left-handed rock bolt:

1. A rod body with a tensile strength higher than that of rock and soil;

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

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

Generally speaking, the left-handed rock bolt is a rod system structure reinforced by geotechnical body. The longitudinal tensile force of the rod body overcomes the disadvantage that the tensile capacity of the geotechnical body is far lower than the compressive capacity. From the surface effect, it limits the separation of the rock and soil body from the original body; on the macro level, it increases the cohesion of the rock and soil body; from a mechanical point of view, it mainly improves the cohesion and internal friction of the surrounding rock body angle. In fact, the left-handed rock bolt is located in the rock and soil body and forms a new composite body with the rock and soil body. The rock bolt in this composite body is the key to solve the low tensile strength of the surrounding rock body, thereby making the rock and soil body's own bearing capacity greatly strengthened.

The above is some common knowledge about left-handed rock bolts. Rock bolts are the basic component of roadway support in contemporary underground mining mines. They are not only used in mines, but also in engineering technology. They are used for slopes, tunnels, dams, etc. Active reinforcement, the overall effect is very good!

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