As a tension member deep in the stratum, one end of the bolt is connected with the engineering structure, and the other end is deep in the stratum. The whole bolt is divided into a free section and a anchoring section. The free section refers to the area where the tension at the head of the bolt is transmitted to the anchor solid, and its function is to impose prestress on the bolt. The anchorage section refers to the area where the cement slurry binds the prestressed reinforcement to the soil layer. Its function is to increase the bonding friction between the anchor solid and the soil layer, increase the bearing effect of the anchor solid, and transfer the tension of the free section to the depth of the soil。