Rock anchor is a tensile member deep into the stratum. It was originally used as roadway support in the coal mine. It can strengthen the surrounding rock along the roadway and make the surrounding rock support itself.

The formation of rock anchor mainly depends on the following three factors: one is used to support the rock and soil body; One end of the rod body can closely contact the surrounding rock and soil body to form frictional resistance. The other end of the outer bar prevents the surrounding rock and soil from spilling out.

One end of the rock anchor goes deep into the stratum, and the other end needs to be connected with the engineering structure. The whole rock anchor can be divided into free sections that apply prestress to the bolt and anchorage sections that increase the friction between the bolt and the soil layer. The free section can transfer the tension at the head of the bolt to the anchorage section. The anchorage section refers to the section where the prestressed tendon is bonded to the soil structure, which is mainly used to increase the pressure on the anchor solid and to transfer the tension to the deep soil. The rock anchor mainly consists of friction bolt, spin bolt, self - attack bolt, auger bolt, spin grouting bolt and spin resin bolt. Friction bolt pair is used in coal mine. The self-rotating bolt adopts hollow continuous small spinning structure. It is a kind of screw bolt. The self-tapping bolt is suitable for loose, collapsible rock, loess or silt.

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