Analysis on mechanical characteristics of roadway reinforcement body surrounding rock

In order to determine the reasonable parameters of bolt support and get the rapid evaluation method of stability of surrounding rock, the homogenization method is adopted to consider the complex of rock and bolt as a reinforcement body with uniform material at the same time. According to the elastic mechanics, the coordinate deformation of the anchorage body and reinforcement body with the surrounding rock is analyzed. Based on the displacement equivalent conditions and the strength enhancement theory of the surrounding rock, the expression of the physical and mechanical parameters of the reinforcement body is deduced. On this basis, a mechanics model of coordinate deformation of surrounding rock and reinforcement body is established. The theory is compared with the existing theories and numerical simulations, and the changes of the physical and mechanical parameters of the reinforcement body under different bolt supporting strengths are studied. The results showed that the calculation results in this paper are similar to Gao Jiamei1, and are closer to the results of FLAC3D numerical simulation, which verifies the rationality of surrounding rock reinforcement body theory. Compared with other parameters of anchor bar, preload, anchor length and anchor spacing have a great influence on the physical and mechanical parameters of the reinforcement body.